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Tems11 [23]
3 years ago
9

What is the function of phosphoribosyltransferases?

Biology
1 answer:
Mnenie [13.5K]3 years ago
3 0

Answer:

a. they are central to the re-synthesis of nucleotides from bases in salvage reactions.

Explanation:

Phosphoribosyltransferases are the enzymes that are involved in salvage pathways to reuse the free purines and pyrimidines to make nucleotides. Metabolic degradation of nucleotides releases purines and pyrimidines which in turn enter the salvage pathway to be reused in the formation of new nucleotides. These metabolic pathways that make new nucleotides by reusing the free purines and pyrimidines are called salvage pathways.

Example: Adenosine phosphoribosyltransferase is the enzyme that catalyzes the formation of adenine nucleotide from free adenine and PRPP (5-phosphoribosyl-1-pyrophosphate).

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Glycolysis occurs in the cytosol, but the Krebs cycle and electron transport chain occur inside the mitochondria. Electron carriers such as NADH produced during glycolysis and the Krebs cycle pass their electrons to the electron transport chain, which results in synthesis of a lot of ATP.

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What type of cells are found in your body?
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Specialised cells , nerve cells , blood cells
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The semilunar valves prevent backflow of blood into the _____.
GREYUIT [131]

Answer:

The semilunar valves prevent backflow of blood into the ventricles.

Explanation:

The semilunar valves are valves found at the junction between the left ventricle and the aorta and also between the right ventricle and the pulmonary artery. They are cup-like in shape and prevent blood from flowing back into the ventricles which are the pumping chambers.

There are two types of semilunar valves. The aortic semilunar valves and the pulmonary semilunar valves. They are made up of the endocardial and connective tissue.

The closure of the semilunar valves causes the second heart sound detected on the stethoscope.

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4 0
4 years ago
Phosphorus (P) often occurs as a waxy solid in its natural state. Ifyou subdivide a piece of phosphorus until you have the small
ANTONII [103]

Answer:

An atom

Explanation:

An atom is defined as the smallest, indivisible unit of a substance.

Elements are defined as the simplest part of a substance that can no longer be broken down in a reaction.

<em>Elemental phosphorus is a substance and when a piece is subdivided until it becomes physically impossible to divide further, then it becomes an atom of phosphorus.</em>

The correct answer is atom.

4 0
3 years ago
The divisions of the nervous system that have antagonistic actions, or opposing actions are A) motor and sensory. B) sympathetic
Effectus [21]

Answer:

B) sympathetic and parasympathetic

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e autonomic nervous system also called the vegetative nervous system is part of the peripheral nervous system which inervates  smooth muscle and glands. Thus, it directly affects the function of internal organs and  regulates  functions such as the heart rate, digestion, respiratory rate,  urination etc. This nervous system control is  unconscious.

The autonomic nervous system is divided into: the sympathetic nervous system, the parasympathetic nervous system and the enteric nervous system.

Parasympathetic nervous system works when organism is at rest so it is known as system responsible for "rest and digest functions". On the other hand, sympathetic nervous system works at active and stressful situations and it is known as "fight and flight" system.

7 0
4 years ago
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