Could you tell me what is a mutagen?

Answers

Answer 1
Answer:

Answer:

The answer is Mutagen is biological agent that alters the genetic information of an organism

Explanation:

A mutagen is a physical, chemical or biological agent that alters or changes the genetic information of an organism and therefore increases the frequency of mutations above the natural level. it is a permanent change in the genetic material of a cell or a microorganism, which can alter a trait or a characteristic of a person or cause disease.

Answer 2
Answer: an agent, such as radiation or a chemical substance, that causes genetic mutation.

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Please help me really quick :)

Which organelle can be compared to a security guard who decides whom may enter a building and whom may not?

Answers

The answer is the cell membrane. The cell membrane controls what nutrients come in, and what unneeded material comes out. It protects the cell from anything that might come in and harm it. It is kind of like the security guard. A security guard let's the good people in and keeps the bad people out.

Final answer:

The cell membrane is comparable to a security guard. It regulates the substances that enter and exit cells, allowing necessary substances in and keeping harmful ones out.

Explanation:

The organelle that can be compared to a security guard who determines who is allowed to enter and exit a building is the cell membrane. The cell membrane, also known as the plasma membrane, is a biological structure that separates the interior of cells from the outside environment. It functions similarly to a security gatekeeper, regulating the transport of substances in and out of cells. For example, it allows useful substances such as glucose and amino acids to enter the cell while preventing harmful substances from entering. In this way, the cell membrane ensures the safety and functionality of the cell, acting as its security guard.

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Which statement about plants cells is MOST accurate?A) Plant cells take in nutrients by phagocytosis.
B) Plant cells do not need nutrients since they make their own food.
C) Plant cells get nutrients through the decomposition of organic matter.
D) Plant cells, like animal cells, take in small molecules through the cell membrane.

Answers

i would say D :) I hope i helped

Identify all of the true statements:

A concentration gradient is the difference between
two concentrations

Active transport allows cells to transport molecules
against a concentration gradient

Diffusion results in a net overall movement from a low
concentration to a high concentration

In diffusion particles are moving around randomly in
all directions

Osmosis requires energy from respiration to be carried
out

Partially permeable membranes allow any molecules
to pass through them

Answers

Explanation:

a) True. The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse.

b) True. Active transport requires cellular energy to achieve this.

c) False. Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration.

d) True. For diffusion to work, the particles must be able to move around.

e) True. Osmosis requires energy from respiration to be carried

out.

f) False. Partially permeable membranes allow  only water but not other dissolved substances to pass through.

Which statement accurately describes the relationship between the brain and addiction?A. Normal activities produce heightened responses once receptors are reduced.   B. A higher amount of addictive chemicals are needed to get the same high when fewer receptors are present.   C. The brain reacts to excessive dopamine levels by increasing the number of dopamine receptors.   D. All drugs act on dopamine synapses in the same way.

Answers

 C. The brain reacts to excessive dopamine levels by increasing the number of dopamine receptors. 

The statement accurately describes the relationship between the brain and addiction. There is a significant link between neurotransmitters and its influence on the activity and the emotion that we feel towards that set of activity. When there is an abnormal or disoriented amount of neuro-chemicals then it would cause some dysfunctional responses on the activity. 

Jerome also had blood work done to confirm the MI. The presence of troponin, or cardiac enzymes such as CK-MB, are a positive indicator of an MI. Why is their presence at higher levels in the blood indicative of an MI?a. They are by-products of aerobic metabolism and if they are present in higher amounts in the blood it shows that the myocardium is working harder.
b. They are substrates for aerobic metabolism and if increased in the blood show that the cardiac muscle is not functioning normally.
c. These proteins are normally found inside cardiac muscle cells and if present in the blood indicate damage to the cells.
d. They are by-products of anaerobic metabolism (glycolysis) and if increased indicate that the heart is not receiving oxygen.

Answers

Answer:

c.These proteins are normally found inside cardiac muscle cells and if present in the blood indicate damage to the cells.

Explanation:

  • When there is a decreased blood flow to the heart or if a particular part of the heart stops working then this is known as myocardial infarction (MI) and due to this the heart muscle gets damaged.
  • There are several biomarkers that are used to evaluate the functioning of the heart and these are known as cardiac markers, an example of this is Ck-MB which is an isoform of creatine kinase.
  • The CK-MB isoform is found in the cytosol of the heart muscle cells and it plays a role in causing the movement of high energy phosphates in and out of the mitochondria.
  • If there is a damage to the heart muscle cells which usually occurs following a myocardial infarction CK-MB levels elevates in the blood for a short period of time and this indicates MI.

Is there a breed of male cows that have udders?

Answers

Answer:

Bull and cow not have udders

Explanation:

Thats

Final answer:

No, there is no breed of male cows that have udders. Udders are mammary glands found in female cows, and their purpose is to produce milk. The udders of female cows are an important reproductive feature that allows them to nourish their young with milk after giving birth.

Explanation:

No, there is no breed of male cows that have udders.

Udders are mammary glands found in female cows, and their purpose is to produce milk. Male cows, also known as bulls, do not have udders because they do not produce milk.

The udders of female cows are an important reproductive feature that allows them to nourish their young with milk after giving birth.

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