Answer:
Mitotic phase
Explanation:
Cell cycle is composed of interphase and mitotic phase. Interphase is aphase of cell preparation. It is subdivided into:
G1 (gap 1 phase)-the cell grows and becomes largerS phase- replication of DNA, duplication of centrosomesG2 (gap 2 phase)-proteins and oranelles are madeMitotic phase is phase of cell division, chromosomes are separated, daughter cell get identical sets of chromosomes. It is followed by cytokinesis-separation of cytoplasm. Stages of mitosis are:
prophase-condensation of chromatin into chromosomes, the nuclear envelope breaks down, mitotic spindle formationmetaphase-the chromosmes line up (metaphase plate)anaphase-the siste chromatides move toward opposite cell polestelophase-the nuclear envelope forms again, cell division is almost completewhich statement correctly describes the relationship between bones and muscles
a. a muscle can both push and pull a muscle, causing it to move
b. bones can move without the aid of muscles
c. moving a bone back and forth requires the action of at least two muscles
d. a bone needs only one muscle to move it back and forth
Answer:
C
Explanation:
Bones are moved at the joints by muscles. It requires at least two muscles acting antagonistically on the bone to move the joint. When one muscle contracts, the other relaxes. Muscles are attached to bones through tendons. An example is the humerus (bone of the upper arm) is moved at the elbow by the antagonistic action of the biceps and triceps.
Green plants need light in order to survive. Structures in the leaves absorb light, which in turn, helps plants make their own food.
Under which color of light will plants be least likely to make food?
red
blue
orange
green
Answer:
The correct answer is the green light.
Explanation:
Plant themselves have a green color pigment in their leaves called chlorophyll which absorbs visible light.
Pigments absorb mostly the red and blue color light and reflect green light. This the reason why plants appear green to us and least likely to make food. Most of the autotrophs contain this green pigment.
Thus, the correct answer is the green light.
green light is the correct answer....hope this helps :))))
How did the agricultural revolution lead to an increase in human population numbers? How did the agricultural revolution lead to an increase in human population numbers? The shift from a nomadic lifestyle to settling down on farms led to people producing more food to meet their nutritional needs, and therefore, having more children. Farming allowed for the discovery of pesticides, which allowed for better food production. The discovery of medicines, such as antibiotics, allowed us to live longer. Industrialization and manufacturing allowed us to produce more food.
Answer:
The shift from a nomadic lifestyle to settling down on farms led to people producing more food to meet their nutritional needs, and therefore, having more children.
Explanation:
The agricultural revolution is in many ways the most important turning point in the development of the humans. The humans saw the potential in some of the wild crops and that they can cultivate them. In order to do so, the people had to settle and create farmlands, and so they did. For the first time the people started to produce their own food, and not just that they were producing, but it was in such a high amount that they were able to have food for the whole year and more. This resulted in a gradual increase of the human population, as the worry about food was no longer there, the people had shelters and were living in larger groups so they were protected from predators, and they were not risking and losing their lives while hunting larger animals. As the populations were growing, the settlements that had tens or hundreds of people started to grown, and they gave birth to the first towns and cities.
The Agricultural Revolution led to an increase in human population numbers by providing more abundant and reliable food sources through the domestication of plants and animals, technologically advanced farming practices, and creating food surplus that allowed larger family sizes and socio-economic developments.
Explanation:The Agricultural Revolution, a shift from nomadic hunting and gathering to settled farming, played a pivotal role in increasing human population numbers. In essence, the development of agriculture leads to various socio-economic changes that spurred exponential population growth.
One significant transformation was the domestication of plants and animals, which provided more abundant and reliable food sources. Regions across the globe including the Near East, China, Sub-Saharan Africa, Mesoamerica, South America, independently developed unique types of domesticated plants based on their natural vegetation. For instance, grains like wheat and barley were cultivated in the Near East while maize and rice were grown in Mesoamerica and China respectively.
Similarly, advancements in technology, specifically the invention of the steam engine and agricultural machines, allowed for more efficient farming practices and increased the amount of available resources to sustain human life. The change from subsistence farming to the practice of planting large fields of a single crop substantially improved food production.
Moreover, agriculture gave birth to labour specialization and prompted socio-economic developments. As food surplus was created, not everyone was needed in the fields, therefore, new occupations surfaced and trade systems developed. Furthermore, larger family sizes were sustained by the enhanced food production, which contributed to a dramatic increase in global human population.
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Which of the following is most directly responsible for the coupling of excitation to contraction of skeletal muscle fibers?Acetylcholine.Action potentials.Calcium ions.Sodium ions.
Answer:
Calcium ions
Explanation:
The excitation-contraction coupling process is the process by which the electrical activation of muscles (the depolarization of the action potential) leads to the activation of contraction.
An action potential in the skeletal muscles or muscle excitation leads to Ca release from the sarcoplasmic reticulum via calcium channel protein. Released Ca regulates the contraction of the muscle.
How is a species added to the endangered species list?
A species is added to the endangered list when the numbers of the species decrease drastically, making the species dangerously close to getting extinct
What is the function of the conjugation pilus?
Answer:
It is involved in the process of conjugation-exchange of genetic material between two bacteria
Explanation:
Conjugation is one of the ways by which bacteria exchange their genetic material (horizontal gene transfer). Two bacterial cells must physically connect in order to perform the conjugation. The linking occurs through a pilus.
Pilus is an appendage on the surface of bacteria cell and it is also called fimbria. Pilus is filamentous, tubular and composed of oligomeric proteins-pilin.
Donor cell contain pilus that will attach to the recipient bacterial cell and induce the transfer.
The conjugation pilus, also known as a sex pilus, is a hollow tube composed of protein that brings two bacterial cells into contact for the process of conjugation. It enables the transfer of genetic material, usually in the form of a plasmid, from a donor cell (F+) to a recipient cell (F-).
Explanation:Conjugation is a mechanism of horizontal gene transfer in bacteria where DNA is directly transferred from one cell to another using a conjugation pilus, also known as a sex pilus. The conjugation pilus is a hollow tube composed of protein that brings two bacterial cells into contact for the process of conjugation. It enables the transfer of genetic material, usually in the form of a plasmid, from a donor cell (F+) to a recipient cell (F-).
a conservation plan could proceed with a single 20-square kilometer habitat preserve or with two habitat perserves,measuring a total of 20 square kilometers combined. Which perserve format would support more species
Answer:40
Explanation:20+20=40
NEED HELP ASAP
Why is ice so important to the survival of the polar bear in the arctic?
A. The polar bears can’t out swim the seals, so they sit quietly on an ice platform and attack the seals when they come
up for air.
B. The polar bears are hibernating for longer periods of time, so they are not able to get the food necessary to survive.
C. The sea ice is important because the polar bears use the ice to go on their migration to warmer land areas
D. The sea ice provides a place for the polar bears to take a nice nap in the sunshine.
There are a couple reasons the ice is important to polar bears, but given the choices you have the correct one would be:
A. The polar bears can’t out swim the seals, so they sit quietly on an ice platform and attack the seals when they come up for air.
Nephrons located close to the medulla with long nephron loops are called ________ nephrons.
vasa recta
juxtamedullary
Henle
juxtaglomerular
cortical
Answer:
The answer is juxtamedullary nephrons. Hope this helps.
Which describes an African butterfly species that exists in two strikingly different color patterns?a. sexual selectionb. disruptive selectionc. artificial selectiond. directional selectione. stabilizing selection
Answer:
The answer is b disruptive selection. Hope this helps.
What could be a result of an injury to the dorsal column?
1....loss of sensation to pressure and touch
2...loss of control over all involuntary movements
3....inability of the body to maintain homeostasis
4....inability to regulate the sleep-wake cycle
5....loss of motor control
loss of sensation to pressure and touch
Answer is 1
How are girls affected by changes in friendships?
A. Girls are only affected by changes in friendships with their one or two closest friends.
B. Girls are highly resistant to changes in friendships.
C. Girls may be more easily hurt and distraught by frequent changes in friendships. D. Girls are rarely affected by changes in friendships.
c. girls may be more easily hurt and distraught by frequent changes in friendships
Generally, girls may be more hurt and distressed by frequent changes in friendships as they highly value emotional bonds. However, it's important to note everyone deals with these changes differently depending on personal factors like resilience, support system, and coping strategies.
Explanation:
Based on various studies, option C is generally more accurate: Girls may be more easily hurt and distraught by frequent changes in friendships. This does not mean all girls will react the same way, but on average, changes in friendships can significantly impact girls, especially during their formative years. Girls often value close bonds and shared emotions in friendships, and disruptions of these connections can lead to feelings of hurt, betrayal, and loss. Moreover, changes in friendships could influence their self-esteem and overall emotional well-being, which in turn may potentially affect their academic performance and other aspects of their lives.
However, it's important to acknowledge that everyone, regardless of gender, has a unique way of dealing with changes in friendships. The individual's resilience, support system, and personal coping strategies play a crucial role in how they navigate through these changes.
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The relationship between hemoglobin ____________ and po₂ is shown by an oxyhemoglobin dissociation curve.
Answer:
Saturation
Explanation:
Blood oxygen saturation is usually used to detect respiratory insufficiency, this saturation increases according to a hemoglobin dissociation curve.
The curve analysis shows that hemoglobin saturation is linked to partial oxygen pressure (pO₂). The higher the pO₂, the higher the oxygen saturation in the blood. The average saturation in a healthy human being is between 95% and 99%.
Question 21(Multiple Choice Worth 3 points)
(12.05 MC)
A suspect is brought in for questioning about a string of burglaries. This same suspect has been questioned by police before for other crimes. After about a half-hour of questioning, the 17- year-old suspect confesses to the crime. What would make you question the accuracy of this confession the most?
The suspect has only been questioned for a short time
The suspect was probably confused about the process
The suspect is under 18 years of age
The suspect wouldn't admit to one crime and not others
The suspect has only been questioned for a short period of time, cuz the second answer, he has been questioned before, the third one doesn’t make sense cuz it’s just age and fourth doesn’t make sense
Answer:
C - The suspect is under 18 yrs of age
Explanation:
Confessions after long periods of questioning might be used, however, this was only 30 minutes. The suspect has been questioned previously, so he knows the process. He is in fact under the age of 18, and not considered an adult, and juvenile confessions are commonly false. PLUS - I got it right on the test!
Suppose a rock on Earth is dropped in a vacuum and has an initial speed of 0 m/s. What is the rock's speed after 2 seconds, in m/s?
Answer:
Explanation:
There are many different equations which can be used to find acceleration, time, velocity, distance, etc. However, there are three variables we need to take into consideration for this question, initial velocity, acceleration due to gravity, and time.
The equation acceleration= velocity/time, can be used, and we need to remember that on Earth, acceleration due to gravity is calculated to be 9.8 m/s².
So using the equation:
a= v/t
v= a x t
v= (9.8 m/s²) x (2 s)
v= 19.6 m/s
What caused by greenhouse gases? A. the hole in the ozone layer is decreasing B. global warming C. temperature decrease D. weather patterns remaining stable
Answer:
A the hole in the ozone layer is decreasing
B
Explanation:
Put the sequence of protein synthesis in the proper order: amino acids bind to each other, the chain lengthens mrna copies dna according to complementary base pairing dna strands unwind and separate trna binds to the corresponding mrna a stop codon is reached, the newly formed protein is released trna binds to the corresponding mrna mrna leaves the nucleus
Answer:
There is no question to this text.
Explanation:
Protein synthesis begins with the unwinding of DNA, followed by mRNA transcription and transportation out of the nucleus. tRNA then binds to mRNA in the ribosome, linking amino acids to form a protein until a stop codon signals its release.
The sequence of events during protein synthesis is intricate and follows a precise order. Once the double helix of the DNA unwinds, the sequence of the gene is transcribed into messenger RNA (mRNA), which leaves the nucleus and travels to the ribosome. Here, transfer RNA (tRNA) molecules, each carrying a specific amino acid, bind to the corresponding codons on the mRNA in the ribosome. As each tRNA brings its specific amino acid, they are linked together forming a growing polypeptide chain. This process continues until a stop codon is reached, signaling the release of the newly formed protein, which will then fold into its functional three-dimensional shape.
DNA strands unwind and separate.
mRNA copies DNA according to complementary base pairing.
mRNA leaves the nucleus.
tRNA binds to the corresponding mRNA.
Amino acids bind to each other as the chain lengthens.
A stop codon is reached, and the newly formed protein is released.
How are cellular respiration and photosynthesis related?
Answer:
Products of photosynthesis are used in cellular respiration
Explanation:
Photosynthesis is a process performed by the plants (also some algae and bacteria) in which the energy of sunlight is transformed into chemical energy usable by those plants. Necessary components of this set of reactions are sunlight, water and CO2, while resulting products are glucose and oxygen. Products of photosynthesis are then used in the metabolic processes known as cellular respiration. During the cellular respiration, glucose and oxygen are used for the production of ATP, CO2 and water. Cellular respiration is performed in mitochondria of all living organisms.
Photosynthesis occur in the chloroplast, membrane organelles with photosynthetic pigments (such as chlorophyll).
Nitrifying bacteria obtain their chemical energy from: A. the reduction of NO3- to NH4+. B. the formation of NH4+ from N2 gas. C. the oxidation of NH4+ to N2.
Answer:
C. the oxidation of NH4+ to N2.
Explanation:
Nitrifying bacteria are specific types of bacteria that obtain their chemical energy by the oxidation of inorganic nitrogen compounds. The process of nitrification can be divided into two steps:
oxidation of ammonium to nitrite (performed by ammonia-oxidizing bacteria-AOB such as Nitrosomonas)oxidation of nitrite (NO2−) to nitrate (NO3−) performed by nitrite-oxidizing bacteria (NOB) such as Nitrobacter.Photosynthesis is to chloroplasts as cellular respiration is to
Answer:
Products of photosynthesis are used in cellular respiration
Explanation:
Photosynthesis is a process performed by the plants (also some algae and bacteria) in which the energy of sunlight is transformed into chemical energy usable by those plants. Necessary components of this set of reactions are sunlight, water and CO2, while resulting products are glucose and oxygen. Products of photosynthesis are then used in the metabolic processes known as cellular respiration. During the cellular respiration, glucose and oxygen are used for the production of ATP, CO2 and water. Cellular respiration is performed in mitochondria of all living organisms.
Photosynthesis occur in the chloroplast, membrane organelles with photosynthetic pigments (such as chlorophyll).
Photosynthesis occurs in chloroplasts and converts light energy to chemical energy, while cellular respiration takes place in mitochondria, converting glucose into ATP. Thus, the answer to the comparison is 'mitochondria'. These processes form the carbon-oxygen cycle, which is vital for life energy transformations.
Photosynthesis is comparable to cellular respiration in that both are essential processes that take place in cells to make chemical energy available for life. While chloroplasts are the site of photosynthesis in plant cells, where light energy is converted to chemical energy and stored in the form of glucose, mitochondria are the sites where cellular respiration occurs. In cellular respiration, the chemical energy stored in glucose is converted back into ATP, which is a usable form of chemical energy for cells.
Consequently, responding to 'Photosynthesis is to chloroplasts as cellular respiration is to what?', the answer is mitochondria. Both chloroplasts and mitochondria work in tandem to support the life processes of plants. They together form part of the carbon-oxygen cycle, showcasing a biological, cyclical harmony, which is essential for energy transformation and sustaining life.
Scientists in the united states, europe, and africa have now suggested that the hippopotamus is a relative of the
Answer: Hippos spend lots of time in the water and now it turns out (or researchers argue), they are the closest living relative to whales. ... Thewissen says that whales are more closely linked to an extinct pig-like animal, often known as India's pig or Indohyus, while hippos are closely related to living pigs.
Explanation:
Select the answer option that lists the levels of genetic information in order from smallest to largest.
gene; chromosome; DNA strand; genome
DNA strand; gene; genome; chromosome
DNA strand; chromosome; gene; genome
gene; DNA strand; chromosome; genome
genome; gene; chromosome; DNA strand
Answer:
gene; DNA strand; chromosome; genome
Explanation:
Gene is a sequence in DNA molecule that has a function. It codes for a molecule, usually protein that performs a certain function within the cell. It carries the information that is necessary for the gene expression. Gene is copied into mRNA molecule during the process of transcription. mRNA is used for the protein synthesis (translation).
DNA is packed into chromosomes during the preparation for cell division. Chromosome is highly condensed form of chromatin.
Genetic is a whole genetic material of an organism.
Certain genes have apparently unusual inheritance patterns. For instance, in the mouse autosomal gene H19, only the copy inherited from the mouse's mother is expressed. Conversely, in the mouse autosomal gene Igf2, only the copy inherited from the mouse's father is expressed. The consequence of this is that imprinted genes are expressed as if they were present in only one copy, even though there are two copies of each of these genes in each cell. What process or processes are responsible for this phenomenon? (Select all that apply.)None of the answer options is correct.combinatorial gene regulationepigenetic inheritanceX-chromosome inactivationMendelian inheritance
Answer:
epigenetic inheritance
Explanation:
This phenomenon is known as genomic imprinting. Epigenetic control and inheritance is the basis of genomic imprinting: DNA methylation and histone methylation lead to inactivation (silencing) of a certain genes. The epigenetic pattern is imprinted and maintained in parents.
As a consequence of genomic imprinting, specific genes from only one parent are expressed. This is different than Mendelian type of inheritance in which in diploid cell one gene is from father while another is from mother.
The diagram below shows the structure of a segment of DNA.
--
Which of the following best describes the component of DNA labeled with an x in the diagram?
A.
a series of codons
B.
nitrogenous bases
C.
chromosome pairs
D.
sugar and phosphate
Answer:
B. nitrogenous bases
Explanation:
Nitrogenous bases are chemical compounds formed by slightly alkaline rings that contain nitrogen. Together with sugar and a phosphoric acid, they make up ribonucleic acid (RNA) and deoxyribonucleic acid (DNA). It is through these nitrogenous bases that the two strands of DNA are linked. This is exactly what we can see in the picture.
There are five types of bases, which are classified into two groups:
Purine or purine nitrogenous bases: adenine (A) and guanine (G); Pyrimidine or pyrimidine nitrogenous bases: cytosine (C), thymine (T) and uracil (U).Pyrimidine bases are derived from pyrimidine and are formed by a ring (hexagonal) of carbon and nitrogen. The purine bases are derived from purine, are larger and have two rings (one hexagonal and one pentagonal) of carbon and nitrogen.
When Carolus Linnaeus created his classification system in the 1700s, he sorted organisms based on their physical characteristics. In 1990, Carl Woese and his colleagues introduced a new classification system that sorted organisms into three different domains. Which of the following best explains why this change occurred?
Many of the organisms classified by Linnaeus are extinct, and his classification system was considered outdated.
Linnaeus' classification system did not account for similar organisms being found in different geographic locations.
New genetic research showed that organisms with similar characteristics were not related to each other.
Organisms were discovered that belonged in more than one of Linnaeus' kingdoms, based on physical appearance.
Answer:
New genetic research showed that organisms with similar characteristics were not related to each other.
Explanation:
Linnaeus system of classification was based on morphological features such as the morphology of stamen and carpels. however, with new genetic advancement, it was shown that two morphologically similar organisms may have a separate evolutionary history and were not related to each other. Hence, the three-domain system was introduced to classify organisms based on a large number of features (morphological, biochemical, molecular, etc.)
What would you typically see on a beach after winter has ended? Select one: a. Much more sand piled up on the beach. b. Much less sand piled up on the beach. c. The same amount of sand should be at the beach no matter what season it is.
the answer would be (b), do to al the storms and wave heights causing the sand to be pulled offshore
Answer:
The correct answer is option a. "Much more sand piled up on the beach".
Explanation:
Even though for occasional visitors it might seem that beach sand does not move, there is a constant flow of sand between the land and the ocean. Typically, you will see much more sand piled up on the beach after winter has ended. During winter there is much less sand on the beach because winter storms produce high energy waves that pull sand offshore. Once winter has over, the gentle waves of summer carry sand back on to the beach.
What are cells where the genetic material is contained in membrane-bound nuclei?
Answer:
Eukaryotic cells
Explanation:
There are two main types of cells among living organisms:
Eukaryotic cell (plants, animals, fungi) which is more compound, conntains nucleus with genetic material in it, membrane-bound organelles (mitochondria, Golgi apparatus, lysosomes etc). Because of their complex structure, the process within such cells are often more comlex then those in prokaryotes. Eukaryotic organisms are usually multicellularProkaryotic cell is simple cell found in Archea and Bacteria kingdom. It doesn't have nucleus neither membrane-bound organelles. Genetic material of these cell is located within the cytoplasm together with proteins and metabolites. First living cell was prokaryotic cell. Organisms that are prokaryotic are usually unicellular.perimenopause ____.
a. is marked by limited changes in reproductive hormones
b. occurs five to eight years after the final menstruation
c. is the period after a woman's last menstruation
d. is the period from a woman's first irregular cycles to her last menstruation
e. is marked by only trivial symptoms
Answer:
a. is marked by limited changes in reproductive hormones
Explanation:
Enzymes affect the reactions in living cells by changing what?
Answer:
Speed of Biochemical Reaction (Lowering the Activation energy)
Explanation:
Enzymes are catalyst that speeds up the rate of biochemical reaction in living organism. They are protein in nature and they are involved in every process that take place in living organisms such as breaking down of food to building up of protein. In living organism, enzymes speed up the rate of chemical reaction by lowering the activation energy thereby bringing the reactants close to each other and weaken there chemical bonds which will enable the reactions to be faster.
Enzymes affect biochemical reactions in living cells primarily by lowering the activation energy, thereby increasing the reaction rate. They are specific to certain molecules and their activity is influenced by factors including temperature and pH.
Explanation:Enzymes, which are typically proteins, play a crucial role in living cells by affecting the rates of chemical reactions. These are known as catalysts in biochemical reactions. The primary way enzymes affect these reactions is by lowering the amount of energy needed to start them, which is known as the activation energy.
The enzymes' activity can be influenced by factors such as temperature and pH, as well as the concentration of the reactants and the enzyme itself. Each enzyme is specific to its substrate, meaning it only acts on certain molecules within the cell. This precise interaction allows enzymes to speed up vital reactions that need to occur within the cell.
Therefore, the presence and activity of these enzymes ultimately determine which reactions will proceed and at what rates. For example, enzymes like salivary amylase act as catalytic enzymes to affect the rate of digestion in the human body.
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Which of the following characteristics of DNA-dependent DNA synthesis is NOT the same for DNA-dependent RNA synthesis?
Synthesis requires a template.
Initiation involves the recognition of a specific DNA sequence.
Initiation of synthesis requires a primer.
Synthesis is catalyzed in the 5′ to 3′ direction.
All of the choices given are the same for both DNA and RNA synthesis.
DNA and rna is not the same?