While looking at bacteria under a microscope, you decide to take a break. When you return, the amount of bacteria has doubled in size. Your break probably only took _____.
24 hours
1-3 hours
8 hours
48 hours
The correct answer is 1-3 hours.In ideal laboratory conditions, some types of bacteria can double in size in as short as 20 to 30 minutes. Therefore, the break probably only took 1-3 hours for the bacteria to double. This doubling time leads to a J-shaped exponential growth curve, which can vastly increase the bacterial population over a short period.
When observing bacterial growth under a microscope, the time it takes for a bacterial population to double in size, known as the doubling time, can vary based on the environmental conditions and nutrient availability. In ideal conditions, some bacteria can double every 20 to 30 minutes, while in less favorable conditions, the doubling time might be extended to several hours. Based on the information provided, a doubling time was interpreted as relatively rapid, implying that the break taken was likely 1-3 hours, during which the amount of bacteria observed doubled.
For a bacteria culture that doubles every 30 minutes, we can calculate the growth over time. Starting with a specific number of cells, say 1 × 105 cells, after 2 hours (which is four 30-minute cycles), the population would reach 1.6 × 106 cells given that there is no cell death. This rapid growth pattern, which is common in bacteria under optimal conditions, often leads to a J-shaped exponential growth curve.
It's important to remember that these figures are theoretical and actual bacterial growth can be influenced by various factors such as nutrient availability, temperature, pH, and the immune response of the host in a real-world scenario.
When an atom that has no change loses two electrons, it becomes a ?
Question: When an atom that has no charge loses two electrons, it becomes a:
A: positive ion.
B: negative ion.
C: positive isotope.
D: negative isotope.
Answer:
When an atom that has no change loses two electrons, it becomes "positive ion".
Explanation:
It is known that electrons hold a negative charge. So, when the negative charge that is electrons are taken out an atom then the number of electrons become less in number as compared to the number of protons. Hence, the atom attains a positive charge.An isotope is formed when an atom shows same number of protons and different number of neutrons. So, when an atom loses 2 electrons there will be no change in the number of neutrons. Therefore, an isotope will not form.Thus, it is concluded that when an atom with no charge loses two electrons, it becomes a positive ion.
Human blood has a pH of 7.4 how do buffers in the blood affect the pH
Answer:
Human blood has a pH of 7.4 how do buffers in the blood affect the pH?
It is expedient to note that since pH of human blood tends to be at neutral, buffer ensures that the point of neutrality is maintained in order to avoid having a basic or acidic blood. Proteins in the body works as buffer as well to carryout this activity
Explanation:
How are clouds and fog related to precipitation?
Answer and Explanation:
Both clouds and fog are closely related to precipitation.
This can be explained first by the formation of clouds and fog, which begin when the air contains water vapor. This water vapor is produced when there is an accumulation of moisture in the enviroment which leads to the formation of clouds. A similar process occurs with the formation of fog, which comes from saturation, that occurs after the evaporation and condensation processes that take place after precipitation (water cycle).
Moreover, some types of clouds (cumulonimbus) are associated with precipitation as they could be accompanied by climatic phenomenon such as rain and snow.
Which enzyme is responsible for facilitating the hydrogen bonding between the nucleotides in a new DNA molecule
Answer:
"DNA polymerase" is responsible for facilitating the hydrogen bonding between the nucleotides in a new DNA molecule.
Explanation:
It is an enzyme which helps in synthesis of the DNA molecules from the deoxyribonucleotides, which is considered as the base of the DNA. The enzyme s very much required for the replication of the DNA and they have been seen working in pairs so that similar strands of the DNA can be created from the single DNA molecule. DNA polymerase helps in formation of the copies of the DNA which is in form of the nucleic acid molecules.
Light-absorbing molecules such as chlorophyll are called ____________.
Question 20 options:
grana.
pigments.
stomata.
thylakoids.
Light-absorbing molecules in plants, such as chlorophyll, are called pigments, which absorb light for photosynthesis and give plants their green color.
Explanation:In the process of photosynthesis, light-absorbing molecules that absorb certain wavelengths of light and give plants their green color are called pigments .
The most common pigment is chlorophyll , found in structures like thylakoids within the chloroplasts of plant cells. Unlike pigments, 'grana' refers to stacks of thylakoids, while 'stomata' are tiny openings in the leaf's surface where gas exchange occurs. So, the correct answer is pigments .
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Calculate the total magnification of the medium power ocular objective with a 10X magnification.
Total magnification of the medium power ocular objective with a 10X magnification is 100X
Explanation:
Given: Medium power ocular objective=10X
magnification is 10X
Total magnification= power of ocular objective*magnification
10*10
The magnification of the ocular lens is multiplied with the power of the objective lens. We know that magnification of the objective lens for low, medium and high power are 4X, 10X, and 40X,
A _____ is a sequence of 3 nucleotides within mRNA that encodes for a specific amino acid or termination sequence.
Answer: Codon
Explanation: A codon is a triplet of nucleotides in an mRNA that codes for specific amino acids. There are 64 possible codons. They are called the genetic codes. Three of these codons (UAA, UAG, UGA) do not code any known amino acid and are thus called termination codons. One of the codons (AUG) signals the beginning of translation and is thus called initiation codon.
The principal of Dominance states that
Principle of Dominance was given by Sir Gregor Johann Mendel.
Explanation:Principle of Dominance was given by Sir Gregor Johann Mendel as a conclusion of the monohybrid cross between the different characteristic pea plants. It says that in an organism which is heterozygous for a particular character, only the dominant trait is able to express as a phenotype, not the recessive one. In other words, the recessive allele is completely masked by the presence of the dominant allele. This leads to same phenotype of a homozygous dominant organism and a heterozygous organism.
To test the organism about its heterozygosity, the organism is led through a test cross where the organism is crossed with a recessive organism. If the F1 offsprings are all dominant, then the organism is homozygous dominant, and if the F1 offsprings are of half dominant and half recessive phenotype, then the organism is heterozygous.
The principle of Dominance refers to the genetic phenomenon when two different alleles are present, the dominant allele is expressed and the recessive allele is hidden. An example of this is eye color in humans where brown is dominant over blue.
Explanation:The principle of Dominance in biology is based on genetics. It states that when two different alleles are present, only one is expressed while the other is masked. This expressed allele is known as the dominant allele and the one that is hidden is the recessive allele. For example, in humans having two different alleles for eye color, one brown (dominant) and one blue (recessive), if the person carries both, they will have brown eyes as brown is the dominant trait over blue.
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What is the definition of Mitosis in your own words?
Final answer:
Mitosis is the division of the nucleus in eukaryotic cells, resulting in two identical daughter cells used for growth, repair, and asexual reproduction. It involves several stages and ends with cytokinesis, where the rest of the cell divides, creating two complete diploid cells.
Explanation:
Mitosis is a vital process in eukaryotic cells where the nucleus divides, leading to the production of two identical daughter cells. It is primarily used for growth, repair, and asexual reproduction. The process of mitosis has several stages: prophase, prometaphase, metaphase, anaphase, and telophase, each with critical functions to ensure accurate duplication and separation of the cell's DNA.
During mitosis, the cell's DNA and other organelles are first replicated. Then, mitotic spindle fibers, which are made of microtubules, attach to each chromosome's centromeric region. These spindle fibers align the chromosomes in the center of the cell and later pull apart the sister chromatids to opposite sides of the cell. In humans, this results in 46 chromosomes on each side of the cell. Following the division of the nucleus, cytokinesis occurs to divide the cytoplasm, resulting in two distinct diploid cells with the same genetic material as the original cell.
The ability of cells to undergo mitosis ensures that variations, such as those seen in cancer cells, can be replicated within the organism, although these variations will not be passed down to the next generation unless they occur in germ cells.
Final answer:
Mitosis is a crucial biological process wherein a single cell divides to form two identical daughter cells, each containing the same number of chromosomes as the parent cell. This process involves the copying of chromosomes, segregation of sister chromatids, and culminates in cytokinesis to produce two separate but genetically identical cells.
Explanation:
Mitosis is a process that facilitates the division of a cell's nucleus into two identical nuclei, each housing its own full set of chromosomes. This process is essential for the growth, repair, and asexual reproduction of organisms. During mitosis, the cell's chromosomes are copied and then distributed evenly to two daughter cells, ensuring that each new cell contains the same genetic information as the parent cell. Cytokinesis, often following mitosis, completes the cell division by splitting the cell's cytoplasm and its contents, thus forming two separate and independent cells. This mitotic (M) phase of the cell cycle results in the formation of two diploid daughter cells, each with its distinct nucleus and cellular structures.
Which is part of the theory of evolution by natural selection?
O
A. Only the best-adapted animals in a population survive.
B. Evolution can only cause small changes to a species.
C. Adaptations cannot be passed along to the next generation.
) D. Animals that survive cannot pass along their adaptations.
Answer:
The correct answer is: A. Only the best-adapted animals in a population survive.
Explanation:
Natural Selection is the process by which the individuals of a species which has the potential to sustain and survive in adverse or changing environment gets a survival advantage over those individuals which are unable to adapt themselves to altered environmental conditions.As the less potent individuals die in altered environmental conditions the adaptable individuals escapes competition with them for natural resources.Evolution causes species to alter their characteristics depending upon the demand of the conditions. These changes can vary, can be less or drastic.Animals pass all the newly adapted traits to the successive generations either as genetic traits or as acquired traits, as this is necessary for the offspring to survive in the altered environment.Natural selection is best defined as "the survival of the fittest".Answer:A
Explanation:
mercury is a pollutant classified as___?
A. a radioactive waste
B. a heavy metal
C. an organic material
D. a pathogen
Answer: B. a heavy metal.
Explanation:
Mercury is a heavy metal and can be quite toxic if leaked out
Answer:
heavy metal
Explanation:
What group is entirely unicellular?
organisms
prokaryotes
fungi
eukaryotes
Answer:
promaryotes and eukaryotes
Which of the following is not a component of the cell theory?
- cells are the basic unit of organization in organisms
-all living things are made of cells
-all cells contain nuclei
-all cells come from pre-existing cells
That all cells contain nuclei is NOT a component of the cell theory
Explanation:
Not all cells contain a nuclei. Cells are even categorized based on this attribute. Eukaryotic cells have a nucleus while prokaryotic cells do not. This property, therefore, cannot be used to categorize all cells. Prokaryotic cells have a nucleoid, which is not a true nucleus, but only a region in the cell where the genetic material of the cell can be found.
The other 3 choices are the universally-accepted tenets of the cell theory;
-cells are the basic unit of organization in organisms
-all living things are made of cells
-all cells come from pre-existing cells
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The cell theory states that cells are the basic unit of organization in organisms, all living things are made of cells, and all cells come from pre-existing cells. However, not all cells contain nuclei.
Explanation:In the cell theory, all of the following components are true except for the statement that all cells contain nuclei. While many cells do have nuclei, there are exceptions to this rule, such as red blood cells and some bacteria, which lack a nucleus. The other components of the cell theory are that cells are the basic unit of organization in organisms, all living things are made of cells, and all cells come from pre-existing cells.
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If these rock layers have been undisturbed, which layer is the youngest?
Answer: A
Explanation:
Answer:
I think it is A, because the rocks that are at the top are the youngest and the ones that are on the bottom are the oldest.
Explanation:
What causes fingers to look wrinkled after soaking in water?
O
A. The skin cells lose all their water.
O
B. Salt enters the skin cells.
O
c. Water enters the cells in the skin.
O
D. The skin cells shrink in size.
SUBMIT
the answer is C. water enters the cells in the skin
what is one characteristic of life that is not essential to the life of the organism but is necessary to its species
Answer:
The answer is reproduction.
Humans are different from each other in many ways, including in their sizes, shapes, skin color, facial features, and handedness. However, all humans are classified as one species because it is possible for one person from one location on the Earth to reproduce with another person from a different location on the Earth. What other evidence can be used in support of the idea that humans are a single species and unique from other species? A. All humans have one vertical line of symmetry in their body plans. B. Humans from different locations speak different languages. C. Humans from different locations can donate blood and organs to one another. D. All humans possess body hair.
Answer:
The correct option is C) Humans from different locations can donate blood and organs to one another.
Explanation:
Organisms belonging to the same species can interbreed and produce fertile offsprings. As humans all around the world can interbreed and produce fertile embryo hence all human beings belong to the same species. Also, the organs and blood of organisms from the same species can be transferred depending on the compatibility. It is less likely for the human body to reject a graft from other human being rather than another species. Although, xenotransplantation has been practiced in the laboratory by scientists but it has not produced any good results.
PLEASE HELP ASAP!!!
To which classification levels does this scientific name "Canus nipponicus" belong?
A. kingdom and phylum
B. phylum and genus
C. genus and species
D. kingdom and species
Answer:
ALRIGHTY IMA HELP YA DONT WORRY!
The Answer is: C
Explanation: I dont know how to explain it lol but pretty sure im right.
A mechanism of evolution that suggests changes in the gene pool of a population are due to chance is
genetie di
natural selecting
gene flow
evolution
Answer:
Genetic drift
Explanation:
Genetic drift is the change in the frequency in which an allele occurs in a population due to random sampling meaning the alleles in the offspring in a population are a random sample of those in the parents.Genetic drift being an evolutionary process leads to changes in the gene pool of a population over time.
Experiments and observations verify scientific laws.
True
False
Answer:
true
Explanation:
which type of macromolecule is responsible for long term energy storage
Carbohydrates
Proteins
lipids
nucleic acids
Answer:
Lipids
Explanation:
Lipids, or fats, are the macromolecules responsible for long-term energy storage. They provide more than twice the energy per gram compared to carbohydrates and proteins, making them efficient in providing energy for longer periods of time.
Explanation:The type of macromolecule responsible for long-term energy storage is lipids. Lipids, specifically fats, are significant for long-term energy storage because they deliver more than twice as much energy as carbohydrates or proteins per gram, making it a highly efficient form of stored energy. Examples of lipids include fats, oils, and waxes. Conversely, carbohydrates are typically used for quick energy boosts, proteins for repaid and cellular function, and nucleic acids for genetic information storage.
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In the Linnaean system, birds and reptiles are each classified in a separate class. However, in the modern system, birds are members of the
clade Reptilia. Which conclusion, based on evidence, did scientists cite to revise the classification of birds?
A Birds and reptiles have adaptations for surviving in similar habitats.
B. Birds and reptiles both rely on DNA, RNA, and the universal genetic code..
C. Birds and reptiles share many behavioral traits, such as laying eggs in nests.
D. Birds descended from the most recent common ancestor of reptiles.
Answer:
The correct option is D) Birds descended from the most recent common ancestor of reptiles.
Explanation:
The modern system of classification is based on the evolutionary history of organisms. The organisms having more common ancestors from the past stand more closely together in the evolutionary tree. The evolutionary history of the birds showed that birds originated from an ancestor which was a reptile in the past. Hence, in the modern system of classification, birds are placed as members of the clade reptiles.
Answer:
d
Explanation:
What type of material is exchanged during "crossing over"?
Answer:
gentic materal
Explanation:
Alleles are swapped when crossing over
Answer:
Chromosomal crossover, or crossing over, is the exchange of genetic material between two homologous chromosomes non-sister chromatids that results in recombinant chromosomes during sexual reproduction.
Explanation:
How did the lab activities help you answer the lesson
question: How are relative and absolute dating methods
used to determine the age of rocks and fossils? What did
you learn from conducting this lab?
Answer:
The relative method for dating the age of rocks and fossils helps to date the rocks and fossils by determining the approximate age for the fossil or rock by comparing it to something whose age is already known like similar rocks and fossils. In fact, there are certain rocks and fossils which serve as index fossils for comparison.
Absolute dating method tends to determine a precise age of rocks and fossils by radiometric dating of the isotopes of the rocks and fossils.
A known aged rock or fossil is used in the relative dating while radio isotopes are used in absolute dating method.
Relative dating method:
It compares the rock or fossil with similar rocks which age is already known to determine the approximate age for the fossil or rock.
Absolute dating method:
It use the radio element dating to determine a precise age of rocks and fossils .
Therefore, a known aged rock or fossil is used in the relative dating while radio isotopes are used in absolute dating method.
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Agricultural technology has improved people’s quality of life. Many of the products we use come from ranches and farms that are worked using machines. Which of the following groups of products all come from some type of material raised on a ranch or farm?
Answer:
C. a cotton shirt, a book, and ice cream
Explanation:
A cotton shirt will be made from the cotton crop which is grown by agricultural technology. A book will be made up of paper. Paper comes from woods of the trees, hence it is produced from agricultural technology. Ice cream is made from dairy products which come from animals. Hence, option C is correct.
Other options, like Option A, is not correct because paperclips and plastic bags are nor manufactures from agricultural products. Plastic bags are made from polyesters and paperclips probably from any element like a metal.
a rat becomes a long tailed rat and a short tailed rat over 10000 years. What is this called ?
Answer:
Evolution
Explanation:
Evolution can be described as the changes which occur in a population over a period of time. Over a period of time, organisms tend to evolve those characteristics which make them better adapted to live in an environment. Such changes which occur over a long period of time are termed as evolution. Charles Darwin was the scientist to bring forward the theory of evolution.
The change in the tail length of a rat over a course of many years is an example of evolution.
"The process described is known as speciation.
Speciation is the evolutionary process by which new biological species arise. This can occur over long periods of time, such as the 10,000 years mentioned in the question. In the case of the rat, the original population may have been subjected to different environmental pressures, leading to genetic changes. Over time, these changes can accumulate to the point where two populations of the same species can no longer interbreed successfully, thus becoming separate species. The long-tailed and short-tailed rats in the question are examples of the resulting species after speciation has occurred. There are several mechanisms by which speciation can happen, including geographic isolation (allopatric speciation), ecological divergence (sympatric speciation), and polyploidy (especially in plants)."
Which of the following best describes telophase stage of mitosis
Answer AND Explanation:
Once the chromatids reach the poles they become densely packed together and uncoil. These are destined to become the chromosomes of the new daughter cells. The spindle apparatus breaks down and a nuclear membrane is formed around each set of chromatids. Finally, the cell divides forming two daughter cells. The newly formed daughter cells enter interphase and prepare for the next division.
what characteristics of the circulatory system increase its efficiency?
Answer:
it has thin long capillaries which allows it to carry blood to all parts of the body
Drag the tiles to the correct locations. The tiles can be used more than once. Identify which type of reaction the feature occurs in.
Releases oxygen - Light-dependent reactions
Fixes carbon dioxide - Light-independent reactions
Takes place in the stroma - Light-independent reactions
Takes place in the thylakoid membrane - Light-dependent reactions
Releases oxygen: Oxygen is released as a byproduct during the light-dependent reactions of photosynthesis. These reactions occur in the thylakoid membranes of the chloroplasts and involve the absorption of light energy to convert water into oxygen and ATP.
Fixes carbon dioxide: The process of fixing carbon dioxide occurs during the light-independent reactions, also known as the Calvin cycle. These reactions take place in the stroma of the chloroplasts and involve the conversion of carbon dioxide into organic molecules using the ATP and NADPH produced in the light-dependent reactions.
Takes place in the stroma: The light-independent reactions, or Calvin cycle, occur in the stroma of the chloroplasts. Here, carbon dioxide is captured and converted into glucose through a series of enzymatic reactions.
Takes place in the thylakoid membrane: The light-dependent reactions take place in the thylakoid membranes of the chloroplasts. In these reactions, light energy is absorbed by chlorophyll and other pigments, leading to the conversion of water into oxygen and the generation of ATP and NADPH.
In summary, the features mentioned correspond to specific steps and locations within the process of photosynthesis. The release of oxygen is a result of the light-dependent reactions, while the fixation of carbon dioxide and the synthesis of glucose occur in the light-independent reactions. The stroma is the site of the light-independent reactions, and the thylakoid membranes host the light-dependent reactions.
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