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3 years ago

7) Which of the following is true about p53?

Biology

1 answer:

Kitty [74]3 years ago

7 0

Answer:

D. All of the above

Explanation:

P53 is a tumor protein. It is often referred to as the "guardian of the genome". It can stop the cell from growing, repairs DNA and controls cell death, which is called apoptosis. As the cell is cycle goes on, p53 stops the growth of the cell when there is an error or damage in the DNA. This action prevents the defective cell from replicating. The p53 then signals the production of proteins that repair DNA. If the DNA is not fixable, it programs apoptisis.

If by some chance that the p53 gene are mutated, then it cannot do those functions, which may result in cancer or the uncontrolled replication of defective cells.

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Which is the best answer to explain how energy levels are affected as energy moves through a food pyramid?

faust18 [17]

C!! i had this question before . energy decreases at top

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3 years ago

Suppose the two possible alleles for the height gene are tall and short. If short is recessive to tall, provide the symbol repre

navik [9.2K]

Phenotype - short , Tall

Genotype - tt (short) , TT or Tt (tall)

Explanation:

In Mendelian Genetics, Dominant traits are represented by capital letters and Recessive traits are represented by small letters.

So if height is the character considered, then the traits would be short and tall.

Tall is the dominant phenotype and short is the recessive phenotype.

The alleles of the gene for height are T and t.

The genotype for Tall trait is TT or Tt.

The genotype for short trait is tt.

Therefore, the symbol representation of phenotype (Tall) is TT or Tt and for phenotype (short) is tt.

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3 years ago

Α-adrenergic receptors have a higher affinity for norepinephrine than for epinephrine. Β-adrenergic receptors have a higher affi

Molodets [167]

Answer:

Receptors are highly specific and only have high affinity for those ligands for whom they are specific.

Explanation:

Receptors are proteins that receive a stimulus or bind a ligand and mediate effects via receptor effector system.

Receptors are macromolecules that are highly specific.

The affinity between the ligand and the receptors is determind by the disassociation constant Kd.

The receptors produce maximun effect when an appropriate specific stimulus is present.

Different recptors types are present for different ligands.

For example, muscrinic receptors are specific for acetycholine and adrenergic receptors are specific for adrenaline/nor adrenaline.

It is important to know the specificity so that the body remains in a state of balance.

6 0

3 years ago

Which of the following produces NADH, ATP,and two pyruvate molecules

tatyana61 [14]

In glycolysis, glucose is broken down into 2 pyruvate molecules, NADH and ATP.

7 0

3 years ago

Read 2 more answers

Muscle tissue has all of the following properties except ________. A) contractility B) excitabilityC) extensibility D) secretion

Lelu [443]

Answer:

D) secretion

Explanation:

Muscle tissue is tissue that composes all types of muscles, skeletal, cardiac and smooth muscles. There are four main common properties of all muscles:

Contractility-ability to contract. In the case of skeletal muscles it is voluntary, while in cardiac and smooth muscles it is unconscious.
Excitability-ability to change membrane potential usually by the influence of nervous impulse.
Extensibility-the capacity to lengthen
Elasticity-ability to change its length and then return to previous.

8 0

3 years ago