Answer:
Prokaryotes
Explanation:
A prokaryote can be described as an organism which is unicellular and lacks a nucleus. Other membrane- bound organelles are also absent in the prokaryotes. Organisms of the domain Archaea and Bacteria are prokaryotes.
Eukaryotes are organisms which possess a nucleus and other membrane bound organelles. These organisms are more complex than the prokaryotic organisms. Eukaryotic organisms are usually multicellular. Examples of eukaryotic organisms include humans, dogs, cats etc.
What is the function of a motor neuron
A motor neuron is a neuron that specifically controls the movement and usage of muscles and glands.
A motor neuron carries nerve impulses from the central nervous system to muscles and glands, resulting in their activation. They connect to muscle fibers at neuromuscular junctions and can be precisely controlled based on the motor unit's needs. This nerve impulse transmission results in muscle contraction.
Explanation:The function of a motor neuron is to carry nerve impulses from the central nervous system to muscles and glands. These neurons change nerve signals into activation of these structures. Motor neurons project to the spinal cord to synapse with more motor neurons in the ventral horn of the spinal cord, which then connect to skeletal muscles and cause contractions.
These neurons connect to the muscles at neuromuscular junctions, where they connect to multiple muscle fibers within a target muscle. The number of fibers that a motor neuron connects to varies based on the required precision of the muscle and the force necessary for that motor unit. For instance, the quadriceps have many fibers controlled by single motor neurons for robust contractions that don't need to be precise, but extraocular muscles are controlled by each motor neuron very precisely since moving the eyes requires less force but needs high precision.
Motor neurons transmit nerve impulses to the muscles causing them to contract. At the neuromuscular junction, the motor neuron axons connect to muscle fibers. Here, the motor neurons secrete a neurotransmitter called acetylcholine that binds to receptors on the muscle fiber, triggering muscle contraction.
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There are many factors that influence the number of different kinds of plants in a biome. Why is elevation, or height, a factor that influences what kinds of plants can live in any certain biome on Earth?
Answer:
Elevation, or height, is a factor that influences what kinds of plants can live in any certain biome on Earth because elevation determines the temperature of that place.
Explanation:
The most important factor that is responsible to make the plants grow in that particular area is the climate, and climate is determined by the height and elevation.As the elevation increases (i.e. height from sea level) the temperature of that place decreases. There are other factors like, pollution, humidity level etc. that determines the growth of biome on earth besides height and elevation.Answer:
Answer:
Elevation, or height, is a factor that influences what kinds of plants can live in any certain biome on Earth because elevation determines the temperature of that place.
Explanation:
The most important factor that is responsible to make the plants grow in that particular area is the climate, and climate is determined by the height and elevation.
As the elevation increases (i.e. height from sea level) the temperature of that place decreases.
There are other factors like, pollution, humidity level etc. that determines the growth of biome on earth besides height and elevation.
Explanation:
During what part of the earth's history did living organisms first appear? What were they?
Answer:
The earliest time that life forms first appeared on Earth is at least 3.77 billion years ago, possibly as early as 4.28 billion years, or even 4.5 billion years; not long after the oceans formed 4.41 billion years ago, and after the formation of the Earth 4.54 billion years ago.
Explanation:
Describe how thermal energy and temperature are sim-
ilar. How are they different?
Kinetic energy is the main cause on which both temperature and thermal energy are dependent.
Explanation:
Both the temperature and the thermal energy are physical quantities. Both temperature and thermal energy are having thermodynamic state function. Both of them are measurable in nature that is quantitative . Both of them do not have any direction that is they are scalar quantities.
Temperature is not dependent on the quantity of a substance but in case of thermal energy it is dependent on the quantity of a substance. Temperature is based on the average kinetic energy of given particles but in case of thermal energy it is based on the total kinetic energy of given particles.
What happens to the bases when an insertion mutation occurs
Explain how geographic isolation can affect
evolution.
NEED HELP NOW!!
Answer:
Geographic isolation stops the exchange of genetic material between the two populations. ... Differences in climate and food sources can create selective pressures unique to each population. Eventually, the two populations might become different species, but not always.
Final answer:
Geographic isolation triggers allopatric speciation by physically separating populations, leading to genetic divergence and potentially the evolution of new species. It often results in the emergence of endemic species uniquely adapted to localized environments.
Explanation:
Geographic isolation affects evolution by preventing populations of the same species from interbreeding. This process, known as allopatric speciation, can be initiated by various events, such as the formation of a river or valley, a group of organisms becoming stranded after migrating, or seeds being carried to an island by the wind or ocean currents.
Once populations are isolated, there's no genetic flow between them. Genetic divergence may occur as natural selection acts differently on the populations or as a result of genetic drift. These changes can eventually lead to reproductive incompatibility, meaning that even if the two populations come into contact again, they can no longer interbreed and have thus evolved into separate species.
Endemic species, which are found only in specific geographic locations, are often the result of long periods of geographic isolation that have allowed them to develop unique characteristics catered to their particular environment, isolated from the gene pools of their species located elsewhere.
10. Do you demand a perfect streak or are you able to accept that life is a mix of losses and wins?
Answer: I am able to accept that life is a mix.
Explanation:
not everything in life comes easy and you can learn from your losses to help get more wins.
Why does the United States purchase oil from other countries and the problem this sometimes causes
Answer:
The oil produced in United States is light and low sulfur content and they do not have proper processing facilities, hence purchase it from other countries.
Explanation:
About 9.93 million barrels per day U.S purchase oil from 86 countries. Because the crude oil present is not homogeneous in nature. It is very light in nature with low sulfur content or may be high,this particular factor depends upon the method of the refining. Most of the oil are being exported by the Saudi Arabia and then comes Russia followed by Iraq. Despite the collapse in price, U.S. dependence on foreign oil should continue to decrease.
Which of the following is released by a plant following photosynthesis?
A.
oxygen
B.
nitrogen
C.
carbon dioxide
D.
water
oxygen is released in photosynthesis
Answer:
A. Oxygen
Explanation:
plant release oxygen as a by-product of photosynthesis.
What causes pressure?
A. Converting phases
B. Conduction of heat
C. Changes in bonding
D. Collisions of molecules
Answer:
D
Explanation:
collisions between molecules and atoms push on the container creating pressure
Pressure is caused by collisions of molecules within a gas, as their kinetic activity and interactions with the container walls generate a force exerted over an area.
The cause of pressure, especially when discussing gases, is due to collisions of molecules. When gas molecules move, they bounce off each other and the walls of their container. This action results in a force distributed over the area of the container walls, which is defined as pressure. This concept can be represented mathematically as pressure (P) being proportional to the number of collisions, the mass of the molecules (m), and the square of their velocity (v), simplified as P = Nmv2, where N is the number of molecules.
Moreover, changes in temperature and pressure can affect phase changes, such as melting, freezing, evaporation, and condensation. During such phase changes, energy transfer occurs without a change in the system's temperature, leading to the transition from one phase to another. However, when discussing the direct cause of pressure in a gas, it is the kinetic activity of particles, their collisions, and the resulting force on the area of the walls that is directly responsible.
Fill in the blank.
__________________ uses laboratory methods to look at genes and can be used to identify increased risks of health problems, to choose treatments, or to assess responses to treatments
a.) Genetic modification
b.) Gene therapy
c.) Selective breeding
d.) Genetic testing
Answer:
genetic testing
Explanation:
attached earlobes are a recessive trait in humans. in the tree below, people with attached earlobes are shaded in. which best describes the person labeled X in the tree?
A) a male with one recessive allele
B) a female with no recessive alleles
C) a female with one recessive allele
D) a male with no recessive alleles
Answer:
The correct option is A) a male with one recessive allele
Explanation:
As we can depict, the offsprings are formed by a cross between a homozygous recessive parent and a heterozygous parent.
The outcomes of such a cross will be:
r r
R Rr Rr
r rr rr
The results from the cross show that the offsprings from such a cross will either have both recessive alleles and will have attached earlobes or they will be heterozygous dominant having unattached ear lobes.
As we can see from the pedigree, the person labelled X is not shaded hence it cannot carry the alleles rr. So, the person is heterozygous carrying one dominant and one recessive allele.
Answer:
He's right its A
Explanation:
Hemophilia is an X-linked recessive trait. In a family, the father is unaffected and the mother carries only one recessive allele. (1 point) A. All of the male offsrping would be affected. B. Half of the male offspring would be affected. C. All of the female offspring would be affected. D. Half of the female offspring would be affected.
Answer: The answer is A
Explanation:
Final answer:
The correct answer is B. Half of the male offspring would be affected since they have a 50% chance of inheriting the hemophilia allele from a heterozygous mother. Daughters would only be carriers, not affected, because they inherit a normal X chromosome from their father.
Explanation:
Hemophilia is an X-linked recessive trait, meaning it is carried on the X chromosome. A mother who is heterozygous for hemophilia (carrying one recessive allele) has a 50% chance of passing this allele to her sons, since they receive their only X chromosome from her. The father, who is unaffected, cannot pass the hemophilia allele to his sons as they receive his Y chromosome.
Therefore, the correct answer is B. Half of the male offspring would be affected. Daughters, however, would not be affected because they receive one normal X chromosome from their father and would need to inherit two defective X chromosomes to express the disease, which is extremely rare. As the mother carries only one recessive allele, she could pass the defective gene to her daughters, but these daughters would be carriers, not affected.
How is the skin of a reptile an improvement of the skin of an amphibian?
Answer:
Reptiles have dry and scaly skin, whereas amphibians feel moist and sometimes rather sticky. They are vertebrates and cold blooded like amphibians. As compared to reptiles, amphibians have smooth skin. The skin of most amphibians is not water-proof unlike reptiles.
Explanation:
The movement of water molecules through the environment is known as the
Answer:
osmosis
Explanation:
Movement of a solvent (such as water) through a semipermeable membrane (as of a living cell) into a solution of higher solute concentration that tends to equalize the concentrations of solute on the two sides of the membrane.
which freshwater ecosystems have very low to no water flow
Answer:
Freshwater ecosystems such as lakes and swamps.
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Normal cells may undergo changes during cell processes that can lead to
cancer. However, most of them do not form cancers.
Which of the following explanations accounts for the relatively low rates
of cancer?
A. Cancerous cells die when they are exposed to radiation.
B. Cancerous cells are crowded out by normal cell growth.
C. Cancer cells grow only very slowly at first.
D. DNA repair systems fix the mutation before it causes cancer.
Answer:
A
Explanation:
Which types of organisms are always made up of only one cell each?
Answer: Unicellular organisms.
Explanation:
Answer:
Unicellular organisms: Bacteria, protists, and yeast
Explanation:
Unicellular organisms are made up of only one cell. All of the functions needed by the organism are carried out by that one cell. Bacteria, protists, and yeast are some examples of unicellular organisms.
There are no species of organisms alive today that are directly related to the triceratops. This information indicates that
A.
all organisms that lived in the past can be linked to newly evolved organisms in the present.
B.
triceratops are extinct, and no organisms alive today evolved from the triceratops.
C.
triceratops have evolved into a species that is so different, scientists are unable to discover the connection.
D.
fossil evidence is inconsistent with the theory of evolution.
Answer:
There are no species of organisms alive today that are directly related to the triceratops. This information indicates that triceratops are extinct, and no organisms alive today evolved from the triceratops.
Explanation:
Answer:
b
Explanation:
triceratops are extinct and no organisms alive today evoled
2 Points
Which of the following shows methods of harvesting corn in order from the
lowest rate of resource consumption to the highest?
A. Picked and sorted by hand hand-picked and sorted by a simple
machine picked and sorted by complex machinery
O
B. Picked and sorted by hand picked and sorted by complex
machinery hand-picked and sorted by a simple machine
O
C. Hand-picked and sorted by a simple machine → picked and sorted
by hand picked and sorted by complex machinery
O
D. Picked and sorted by complex machinery — hand-picked and
sorted by a simple machine → picked and sorted by hand
Answer:
The correct option is A) Picked and sorted by hand, hand-picked and sorted by a simple machine picked and sorted by complex machinery
Explanation:
Option A is correct because the first method is to pick ans sort by using the hands only which will be the lowest resource consumption as only hands are being used. The second method illustrates using hands for picking ans simple machinery for sorting. As simple machinery is being used hence this method uses more resources than the first one. The third method described using complex machinery for both picking and sorting, which will use the highest resources.
Answer: D. I just took it
Explanation:
Hi!! Can anyone please help me with the problem linked as a photo? Thanks!!
Two cells will finally be produced .If the parent cell has 2n chromosomes, each daughter cell will have n chromosomes.
1. How many cells will finally be produced?
Two cells will finally be produced.
2. How many chromosomes will be in each cell?
Each cell will have half the number of chromosomes as the parent cell. So, if the parent cell has 2n chromosomes, each daughter cell will have n chromosomes.
3. Sketch one of the final cells, showing its chromosomes.
Here is a sketch of one of the final cells, showing its chromosomes:
+---+---+
| | |
| | |
| | |
+---+---+ +---+---+
| | | | | |
| | | | | |
| | | | | |
+---+---+ +---+---+
This cell has 2n = 4 chromosomes. The chromosomes are arranged in homologous pairs.
The sister chromatids of each chromosome are attached at the centromere.
Additional information about the image:
The image you provided shows the sequence of events in a cell undergoing normal meiotic cell division.
The four diagrams represent the following stages:
Diagram 1: Prophase I. The homologous chromosomes pair up and form tetrads.
Crossing-over, the exchange of genetic material between homologous chromosomes, can occur during this stage.
Diagram 2: Metaphase I. The tetrads align on the metaphase plate.
Diagram 3: Anaphase I. The homologous chromosomes separate and move to opposite poles of the cell.
Diagram 4: Telophase I and cytokinesis. Two daughter cells are formed, each with a haploid set of chromosomes.
After meiosis I, the two daughter cells enter meiosis II. Meiosis II is similar to mitosis, but the sister chromatids of each chromosome separate.
This results in four haploid daughter cells.
Meiosis is essential for sexual reproduction.
It ensures that the offspring have the correct number of chromosomes and that there is genetic diversity in the population.
Which of the following events do biologists consider a random change?
a)directional selection
b)speciation
c)disruptive selection
d)genetic drift
Answer:
D. genetic drift
Explanation:
Answer:
it is d genetic drift
Explanation:
Which of the following would be least likely to be part of an ionic bond?
- calcium
- Carbon
- lithium
- Bromine
Answer:
Carbon is least likely to be part of an ionic bond.
Explanation:
Ionic bond is formed by the process of transformation of electron between two atoms.In ionic bonds the charges of cations and anions are balanced.For the atom of carbon to form an ionic bond it must transfer 4 electron or gain 4 electron from another atom, this is not likely to occur in the chemical reaction.Hence carbon atom shares 4 electron so that it can have the configuration of noble gas.Final answer:
Carbon is the element least likely to be part of an ionic bond, as ionic bonds commonly occur between metals and nonmetals, and carbon is a nonmetal.
Explanation:
The element most likely to be least likely to be part of an ionic bond among calcium, carbon, lithium, and bromine is carbon. This is because carbon (group 14) is a nonmetal and does not typically form ionic bonds, which generally occur between a metal and a nonmetal. Calcium (group 2), lithium (group 1), and bromine (group 17) are more likely to form ionic bonds, as calcium and lithium are metals and can readily donate electrons to nonmetals like bromine, which accepts electrons to form negative ions.
Nutritionists and doctors do not recommend energy restrictions below. Calories for women and. Calories for men.
Nutritionists and doctors recommend not falling below 1,200 calories per day for women and 1,500 calories for men to maintain proper health and metabolism. Athletes may require more, up to 3,000 to 5,000 calories, depending on their level of activity. Balanced diets and avoiding very low-calorie diets are essential for metabolic health.
Explanation:Nutritionists and doctors typically recommend that energy intake should not fall below certain thresholds to ensure adequate nutrition and maintain metabolic health. For women, the lower limit is often set around 1,200 calories per day, while for men it is typically around 1,500 calories per day. These numbers can vary based on the individual's body size, age, activity level, and other health-related factors.
The quality and quantity of the food consumed markedly affect one's metabolism. Energy-dense foods with poor nutritional quality, such as sugary drinks, can lead to weight gain and associated health issues. Nutritional needs increase with physical activity, and athletes, in particular, may require significantly more calories. For instance, competitive athletes often require between 3,000 to 5,000 calories daily, whereas a sedentary person may need only about 2,000 calories. Energy requirements further vary by gender; men generally have higher caloric needs than women due to greater muscle mass.
Regardless of caloric intake, it's crucial to consume a balanced diet rich in vegetables, fruits, whole grains, and lean proteins. It is also important to avoid extremely low-calorie diets, as they can substantially lower basal metabolic rate (BMR) and potentially harm health. Proper caloric consumption aids in maintaining body composition, supporting bodily functions, and ensuring adequate nutrient intake.
Final answer:
Nutritionists typically recommend that women should not consume fewer than 1200 calories per day and men not fewer than 1500 calories per day to ensure nutritional needs are met without adverse health effects. Quality and quantity of food intake are crucial in managing energy needs, which vary based on lifestyle, gender, and activity level.
Explanation:
Nutritionists and doctors typically advise against severe energy restrictions that fall below certain caloric thresholds. For normal daily activities, an average person requires between 1500 to 2000 calories. However, factors such as gender, age, weight, and physical activity level can influence individual energy needs. For instance, men generally need more calories than women due to higher muscle mass. It's important to maintain a balance and consume a diet that provides the quality and quantity of calories necessary to prevent both over-consumption and under-consumption. Over-consumption can lead to health issues such as cardiovascular disease, cancer, and diabetes, while under-consumption can dramatically reduce one's basal metabolic rate (BMR) and lead to other health problems.
Regarding the minimum calorie intake, health professionals generally do not recommend that women consume less than 1200 calories and men less than 1500 calories per day without medical supervision. This is to ensure that individuals still meet their nutritional needs without risking adverse effects on their metabolism and overall health.
In conclusion, a diet that includes a variety of vegetables, fruits, whole grains, and legumes, while limiting sugary drinks and energy-dense foods, is recommended. Additionally, energy needs are highly individualized and should be tailored to one's lifestyle, with discretionary calories adjusted based on activity level and age.
Rasheed crossed plants that were hybrid-have two different alleles for the traits of
flower color, seed color, and seed shape as part of an investigation designed to verify
the results of Gregor Mendel's experiments. The table below displays the results.
RASHEED'S RESULTS
Characteristic
Offspring phenotypes
Ratio
flower color
705 purple
224 white
3:1
seed color
6,002 yellow
2.001 green
3:1
seed shape
5,474 round
1.850 wrinkled
3:1
Based on the information in the table above, which of the following is a valid
conclusion?
A. White flowers are dominant.
B. Yellow seeds are a recessive trait.
c. Wrinkled seeds are a recessive trait.
D.Flower color is the result of environmental conditions.
Answer:
Wrinkled seeds are a recessive trait
Rasheed crossed plants that were hybrid-have two different alleles for the traits of flower color, seed color, and seed shape as part of an investigation designed to verify the results of Gregor Mendel's experiments. Wrinkled seeds are a recessive trait shows the phenotypes.
What is trait ?Traits are the characteristics of a gene in an organism are influenced by the environment and expressed by genes, the Physical characteristics of an organism, such as hair color, leaf form, size, behavioral characteristics are traits.
specific traits which allow an organism to be successful in their ecosystem, some of the physical characteristics include fin length, body shape, color patterns, eyesight, and muscle definition.
Species with variation in traits For example, white-tailed deer in Pennsylvania have seed coat color with limited variation, all the organism have characteristics are genetic traits or behavioral traits.
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Natural selection argue claim evidence reasoning answer
Answer:
how is this a question
Explanation:
Which type of scientific statement is defined as a statement of fact that is generally accepted to be true and universal because
it has always been observed to be true?
theory
probability
law
hypothesis
Answer:
law
Explanation:
a scientific law is based on observations of similar events that is ALWAYS true while a scientific theory is based on repeated observations and scientific investigations that ia ALMOST ALWAYS true
Which animals typically have a reproductive group and a nonreproductive group within their social structure?
Answer: the answer to this question is bees and ants hope this helps
Explanation:
Answer:
bees
Explanation:
edge
A mother carries one allele of a recessive gene for a disease on an autosome, and the father carries no recessive alleles of the gene for that disease. What is the likelihood of their child having the disease?
A. 0%
B. 50%
C. 75%
D. 100%
What is the likelihood of their child having the disease is:
A. 0%
Explanation:
The mother is heterozygous, thus she has an allele which is recessive and the other allele which is dominant.The father has no recessive allele for the gene.During meiosis in mother , two types of gametes will be produced. One type of gamete will have the recessive allele and the other type of gametes will have dominant allele.During meiosis in father, only one type of gametes will be formed which will have the dominant allele only.In a situation a female gamete with recessive allele is fertilized by a male gamete with dominant allele. The resulting zygote will be heterozygous.The effect of the recessive allele will be masked by the dominant allele and the child will not have the disease.In a situation a female gamete with the dominant allele is fertilized by a male gamete with dominant allele then the resulting zygote will be homozygous for dominant allele and obvioiusly the individual will not have the disease.Thus, in this case we can conclude that there is 0% chance of child having the disease.The Law of Independent Assortment describes why there is so much
diversity among offspring of a species. A female rabbit that is
heterozygous for long ears and long fur mates with a male rabbit that is
also heterozygous for long ears and long fur. What is the phenotypic ratio
of the offspring of this genetic cross?
LIFF X LIFE
8:8
8:6:2
1:1:1:1
09:3:3:1
9:3:3:1 is the ratio.
Option D.
Explanation:The cross described here is actually similar to Mendel’s Dihybrid Cross where two characters of the organisms are actually taken into account and then the phenotypic ratio of the F2 offsprings are seen.
The genes for the long ears and long fur are both heterozygous in both parents. So both of the parents have a dominant allele and a recessive allele.
Lets suppose the dominant allele for the gene determining ear is E and recessive is e. And the dominant allele for the gene determining fur is F and recessive is f.
So the genotype of both the parents is EeFf.
So the gametes produced by both the parents are EF, Ef, eF and ef respectively.
Thus, if we put these in punnett square and see the offsprings, we will see that phenotypic ratio of Ling eared long furred to long eared short furred to short eared long furred to short eared short furred is 9:3:3:1.
Answer:
9 : 3 : 3 : 1
Explanation: