Answer:
25% TT 50% Tt 25% tt
Explanation:
Which of the following scenarios describes an example of epistasis?
What o uawant me to do exactly
Answer:
In rabbits and many other mammals, one genotype (ee) prevents any fur color from developing.
Hope this helps!!! :D
The phospholipid bilayer is composed of lipids which are _________ and do not dissolve well in water but do dissolve in oils. The phosphate head does dissolve in water because it is _________ just like water
Explanation:
which are hydrophobic
it is hydrophilic like water
2. Sperm and egg combine in ______________ to produce a zygote with the normal number of chromosomes.
Answer:
Fertilization
Explanation:
The plasma membrane is selectively permeable. It allows some substances to enter and leave the cell unrestricted while others are restricted. Some toxins produced by certain bacteria cross the plasma membrane, interfering with normal chemical reactions, and ultimately killing the affected cell. Why are cells unable to stop the flood of these harmful substances into the cell
Answer:
There are specific receptors present on the surface of the normal cell membrane to recognize the molecules to allow them to pass or not. Most of the bacterial toxin are water-soluble molecules, and bound to the cell surface and interact with them as some time antibody-antigen interaction or cell recognition does not occur that form a pore in the cell membrane and toxins move into the cell.
Once toxins enter the cell they attack intracellular targets through endocytic vesicles. Ultimately these ends in cell death.
The cells are not able to stop the flow of the mentioned harmful substances into the cell as they fail to recognize them as foreign entities. These foreign toxins have intracellular targets with which they bind and lead to death of the cell.
Cell death due to foreign toxins:The plasma membrane is formed of lipids. The toxins produced by the bacterial cells are water soluble. Therefore, they identify particular receptors on the membrane and associate with them. Thus, cell at certain occasions fail to identify them as foreign entities.
They combine with the plasma membrane of the cell and induce pore formation, however, there are many toxins that invade the cell and possess intracellular targets via endocytic vesicles. With the help of these vesicles, they deliver their enzymatic domain into the cytosol and results in the death of the cell by obstructing the metabolism of the cell.
Thus, cells fail to identify the bacterial toxins as foreign entities and they invade the cell and results in cell death.
Find out more information about invasion of foreign toxins here:
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What is a fossil? Give the best definition.
a
the remains of only dinosaurs
b
the preserved physical remains of deceased organisms
c
old rocks of different shapes and sizes
d
dead bodies of plants and animals
Answer:
B
Explanation:
Fossils are ancient sometimes hidden treasures... remains of deceased beings or things that decayed over a period of time.
Please look at the imagine and tell me what the answer is
Answer:
Medial Malleolus is the answer
What is a neap tide? What causes a neap tide?
Organisms use different types of adaptations to aid in their survival. One type of butterfly mimics a dead leaf to evade predators. What type of adaptation is this? a. Biochemical b. Ecological c. Structural d. Physiological Please select the best answer from the choices provided A B C D
Answer:
It's a structural adaption.
-------
Here are examples of the other adaptions:
Biochemical= Being immune to scorpion poison
Physiological= Hyoid bone used for roaring
Ecological= The sand grouse has wings that can hold water in its feathers, so it can take water back to the nest
Answer:
c
Explanation:
i got it right
If the dominant alleles for stem color and fasciation are commonly located on the same chromosome, how could the dominant allele for one of these characteristics and the recessive allele for the other be on the same chromosome?
Answer:
Chromosome crossing over in prophase 1 where DNA segments are moved between the homologous pair.
Explanation:
Which statement best describes a characteristic unique to renewable resources?
Renewable resources are abundant.
Renewable resources form slowly.
Renewable resources can be used to generate electricity.
Renewable resources are found in nature.
Answer:
The correct answer is -
Renewable resources are abundant.
Explanation:
Renewable source of energy which is found in nature in abundant quantity and can be used repeatedly and will never end as it is kept on forming naturally and replaced.
Both renewable resources and non-renewable sources of energy are used to generate electricity. Non-renewable source of energy takes a longer period to form again as it is a slow process however it is not the case with the renewable source of energy.
Answer:
Which statement best describes a characteristic unique to renewable resources?
Renewable resources are abundant.
Renewable resources form slowly.
Renewable resources can be used to generate electricity.
Renewable resources are found in nature.
Explanation:
The correct answer is -
Renewable resources are abundant.
Explanation:
Renewable source of energy which is found in nature in abundant quantity and can be used repeatedly and will never end as it is kept on forming naturally and replaced.
Both renewable resources and non-renewable sources of energy are used to generate electricity. Non-renewable source of energy takes a longer period to form again as it is a slow process however it is not the case with the renewable source of energy.
Predict the effects of injuries to the following structures: Cerebellum, Pons, Thalamus
Answer:
Explanation:
if cerebellum become injured then problems occur in those activities of the body which are controlled by cerebellum like speeching,thinking,learning and sensation of sound and light.
if pons become injured then problems occur in those activities of the body which are controlled by pons like inspiration expiration biological and rhythm.
thalamus control pleasure and fear feelings so if thalamus become injured then problems occur in pleasure and fear feelings
The red squirrel is a species of tree squirrel that can be found in parts of Europe and Asia. In an experiment, a researcher introduced small populations of red squirrels to two different ecosystems at the same time. One of the ecosystems was a large nature reserve. The other was a city park that was about one-fourth the size of the nature reserve. The graph below shows the red squirrel population in both ecosystems over three years.
red squirrel population graph
The graph shows that while the red squirrel population was higher in the nature reserve than the city park, the city park still had a carrying capacity significantly more than one-fourth that of the nature reserve. Which statement could explain why the carrying capacity of the city park was higher than expected?
A.
The nature reserve is much larger than the city park, so its carrying capacity is greater.
B.
The city park contains fewer natural predators of the red squirrel than the nature reserve.
C.
The red squirrels in the city park face intense competition for a limited number of resources.
D.
The red squirrels in the nature reserve are better adapted to live in their environment.
Answer:
B. The city park contains fewer natural predators of the red squirrel than the nature reserve.
Explanation:
When compared to a nature reserve a city park really doesn't have any predators apart from some cats or birds. There really isn't much that can challenge the squirrel in order for their numbers to go down. There is no threat from food shortages and no threat from being eaten by larger animals that could live there.
Answer:
the number of trees in the city park may be limited by humans
the nature reserve may be much larger in area than the city park.
increasing human activity in the city park may disrupt mating opportunities.
Explanation:
The carrying capacity of an ecosystem is usually determined by a combination of factors. Examples of such factors include the boundaries of the ecosystem, the climate, the type and amount of resources available, competition for those resources, and predation.
The researcher's experiment showed that, with respect to the red squirrel, the carrying capacity of the city park is much lower than that of the nature reserve. The possible explanations for this difference are numerous but might include statements like
the nature reserve may be much larger in area than the city park,
the number of trees in the city park may be limited by humans, or
increased human activity in the city park may disrupt mating opportunities.
Any or all of these factors may be responsible for the different carrying capacities of the two ecosystems.
Which statements describe an ecosystem? Check all that apply.
An ecosystem includes nonliving things in an environment.
In an ecosystem, living and nonliving things interact.
An ecosystem includes living things in an environment.
An ecosystem includes only living things in an environment.
Ecosystems are affected by the climate of a region.
Answer:
An ecosystem includes nonliving things in an environment
. In an ecosystem, living and nonliving things interact.
An ecosystem includes living things in an environment.
Ecosystems are affected by the climate of a region.
Explanation:
An Ecosystem includes living things (biotic) and non living things (abiotic) in an environment.
What is ecosytem?An ecosystem is a geographical region in which plants, animals, and other species, as well as weather and landscapes, collaborate to build a living bubble.Living things and non living things interact in an ecosystem.What are the biotic and abiotic components of ecosystem?Living creatures that have a direct or indirect impact on other species in an ecosystem are referred to as biotic components.Plants, animals, and microbes, as well as their waste products, are examples.All chemical and physical elements, or non-living components, make up the abiotic components of an ecosystem.Abiotic components can differ from one ecosystem to the next and from one place to the next.They mostly serve as life supporters.They control and limit the amount, variety, and development of biotic components in an ecosystem.As a result, they are referred to as limiting factors.Hence the correct option is C.To know more about Ecosystem here
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The law of superposition states that rocks or fossils form in layers . The contents of each layer are from which choice ?
(Don’t use for points)
Answer:
A. different time periods
Explanation:
The contents of the layers are from different time periods based on the law of superposition of strata.
This law states that "in an undisturbed sequence of strata, the oldest layer can be found at the bottom and the youngest on top".
The rock layers and their contents are usually from different time periods. Most times biostratigraphic study of the strata would reveal the ages of the beds.
Which type of sensory receptors monitor position and movement of the body?
A. Photoreceptors
B. Chemoreceptors
C. Proprioceptors
D. Exteroceptors
The answer is Proprioceptors.
C is the correct answer my guy
. What are some consequences of using fossil fuels?
Answer:
Air Pollution
Explanation:
Burning fossil fuels emits a number of air pollutants that are harmful to both the environment and public health.
PLEASE HURRY : The tissue that lines the intestine helps release ___ absorb / break down
nutrients by increasing the intestinal surface area. The long extensions of nervous tissue ___
connect/ingest / destroy the cells in the brain and other parts of the body.
The muscle cells are organized into flexible fibers because muscle tissue elongates and ____
absorbs / protects / contracts
How are increasing temperatures likely to effect agricultural
Answer:Climate change can disrupt food availability, reduce access to food, and affect food quality. For example, projected increases in temperatures, changes in precipitation patterns, changes in extreme weather events, and reductions in water availability may all result in reduced agricultural productivity.
Explanation:
The ability to store energy, as in a glucose molecule, is termed
Answer:
The term can either be, a battery, or an accumulator.
Explanation:
If you look at a “battery“ which stores chemical energy, and devices that use it -toys, mechanical tools, etc.- into electrical energy storing it.
Henry has categorized fish as feminine and sharks as masculine. On further reflection, he has refined the categorization of fish. He categorizes passive fish, such as goldfish and clownfish, as feminine, while he categorizes aggressive, carnivorous fish, like piranhas and goliath tigerfish, as masculine. Henry has done a good job of demonstrating ______________
Answer:
categorizing animal species
Explanation:
Nerve cells that direct muscles and glands are known as ____________________ neurons. Nerve cells that carry information (pain, temperature, etc) from the body to the brain are called ____________________ neurons.
Answer:
1.Effectors/motor neurons
2. sensory
Nerve cells that direct muscles and glands are known as motor neurons, nerve cells that carry information (pain, temperature, etc.) from the body to the brain are called sensory neurons. Sensory neurons sense the stimulus that our body gets from the external environment.
What are the different types of neurons?Neurons make up the nervous system that conducts the impulse from the original site to the brain and spinal cord, and the neuron can either be a sensory or motor neuron. The nerve cell in a sensory neuron is stimulated by pain or temperature and converts it into an impulse that travels from the site of the organ to the spinal cord and brain, and after receive it, the action is sent to the effector organs. These muscles and glands respond to stimuli by producing actions.
Hence, Nerve cells that direct muscles and glands are known as motor neurons, nerve cells that carry information (pain, temperature, etc.) from the body to the brain are called sensory neurons.
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Please help!
Possible answers are :
Condition 1
Condition 2
Condition 3
Condition 4
Answer:
condition 3
Explanation:
Water moves from a high concentration to a low concentration across a permeable membrane by osmosis.
For a net loss of water to occur in the cell, water has to move outside the cell.
Therefore, the concentration of water inside the cell has to be higher than the concentration outside the cell.
This is true for condition 3, where the concentration inside is 95% and inside is 90%
D. Which of the following are functions of the cell membrane? Choose 3.
A Cells don't have membranes.
B To regulate what enters and leaves the cell
C To make ribosomes
D To make proteins
E To protect the cell
F To separate the internal and external environment of the cell
Answer:
Function of the cell membrane :----
B. To regulate what enters and leaves the cell
E. To protect the cell
F. To separate the internal and external environment of the cell
The functions of the cell membrane are:
To regulate what enters and leaves the cellTo protect the cellTo separate the internal and external environment of the cellThus, options B, E and F are the correct options.
What is a cell membrane?The cell membrane is a biological membrane that separates and shields the interior of all cells from the external environment. It is also referred to as the plasma membrane (PM), cytoplasmic membrane, or plasmalemma (the extracellular space). The cell membrane is made up of a lipid bilayer, which is two layers of phospholipids interleaved with cholesterol (a lipid component) to maintain the proper fluidity of the membrane at varying temperatures.
Additionally, the membrane is made up of membrane proteins, such as integral proteins that cross the membrane and function as membrane transporters and peripheral proteins that just cling to the cell's outer membrane and function as enzymes to help the cell interact with its surroundings.
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If a woman is heterozygous for widow's peak
(widow's peak is dominant over a smooth hairline) has children with a man with a smooth hairline, what
are the possible phenotypes of their children?
It is impossible to determine the possible phenotypes.
O All of their children will have a widow's peak.
O None of their children will have a widow's peak.
It is possible for their children to either have widow's peak or a smooth hairline.
Answer:
It is possible for their children to either have widow's peak or a smooth hairline.
Explanation:
Let's say that the widow's peak allele is W (dominant) and the smooth hairline is w (recessive).
A woman heterozygous for widow's peak is Ww. A man with a smooth hairline must have two copies of the smooth allele since it is a recessive trait, so he must be ww.
The cross is Ww x ww
W w
w Ww ww
w Ww ww
There is a 50% chance that the children will have the genotype Ww, and therefore have a widow's peak. There is a 50% chance the children will be ww, and will therefore have a smooth hairline.
So, It is possible for their children to either have widow's peak or a smooth hairline.
Which step in the digestive process represents a chemical change in food?
Answer:
digestion
Explanation:
Researchers are studying the abnormal activity of kinases in relation to cancer. Theoretically, how might researchers use signal transduction pathways to influence the environment of cancer cells for treatment? (3 points)
Disrupt the function of protein kinases involved in cell cycle regulation
Inactivate epinephrine receptors on cancer cells
Stimulate production of cAMP in cancer cells
Alter G protein-coupled receptors involved in cell cycle regulation to be active in the absence of their normal signaling molecules
Answer:
I am pretty sure that the answer is A.
Explanation:
Protein kinases regulate the cell cycle by giving the "go-ahead" or "stop" signal at checkpoints in the cycle. A mutation/disruption in the protein kinases can result in it not doing its job properly. As a result, it can give the 'go-ahead' signal to all cells (mutated or not) to continue through the cell cycle. A distrupted kinase will infleunce the enviornment for a cancer cell as the cancer cell can continue to divide continuously.
I do not think the answer is D because G-couped receptirs are not involed in the regulation of the cell cycle. Additionally, I do not think the answer is C since the production of cAMP (a secondary messgenger amplifies transduction signals; this doesn't have anything to do with cancer?) Finally, between A and B I know that a direct result of cancer is due to a distruption in either protien kinases or growth factors (not in the answer choices). Since one of the factors that leads to cancer is present in answer choice A, I think that is the one. However, this is just my reasoning, I am not 100% sure!
Fungi may cause disease in humans through
A. Allergies only
B. Infection and allergies
C. Infection only
D. Infection, poisoning, and allergies
Answer:
i am not sure but probaby d
Explanation:
Which organelle would you be?
Answer:
Organelles of a cell
Explanation:
Answer:
cell
Explanation:
In pea plants, plant height is controlled by a single autosomal dominant gene. Tall plants (H) are dominant to short plants (h). A tall plant with the genotype capital H lowercase h crossed to a tall plant with the genotype capital H lowercase h. In a cross of two tall heterozygous plants, which phenotype ratio is expected from the resulting offspring?
Answer:
3:1 (Tall=75%)(Short=25%)
Choose the answer that is not a fossil.
a petrified T-Rex is found in Montana
a 400-million-year-old fish preserved in rock
a cow skeleton in the desert
dinosaur footprints preserved in mud turned to rock
Answer:
The last one: dinosaur footprints preserved in mud turned to rock
Fossils have to be physical remains of an animal.
Hope this helps!
Answer:
(D) a cow skeleton in the desert
Explanation:
Because a petrified T-Rex is considered a fossil, a 400-million-year-old fish preserved in rock is also a fossil and a preserved footprint from a dinosaur is a fossil, the cow is the only one that is not a fossil because it does not remain or an impression of a prehistorical, organism because cows still exist today
Definition of a fossil: the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
