NURSING ANM AND GNM

NURSING EXAM QUESTIONS

MICROBIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What type of modification in the branched pathway, allows different end-products to produce similar enzymes?
A
cumulative feedback regulation
B
concerted or multivalent feedback regulation
C
isoenzymes with specific regulatory effectors
D
sequential feedback inhibition
Explanation: 

Detailed explanation-1: -The major systems involved are feedback inhibition, feedback repression, and attenuation. Feedback inhibition is the situation where the end product of a biochemical pathway inhibits the activity of an enzyme catalyzing one of the reactions (normally the first reaction) of the pathway.

Detailed explanation-2: -Feedback inhibition, where the end product of the pathway inhibits an upstream process, is an important regulatory mechanism in cells. The production of both amino acids and nucleotides is controlled through feedback inhibition.

Detailed explanation-3: -1: Anabolic and catabolic pathways: Anabolic pathways are those that require energy to synthesize larger molecules. Catabolic pathways are those that generate energy by breaking down larger molecules. Both types of pathways are required for maintaining the cell’s energy balance.

Detailed explanation-4: -Regulation on the physiological level of the pathways to the branched-chain amino acids occurs by the repression of the leucine and isoleucine-valine biosynthetic enzymes. A phenotypic derepression caused by valine was detectable in the case of the latter biosynthetic enzymes.

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