Question 30 Glycogen phosphorylase has its greatest activity when blood glucose

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Question 30 Glycogen phosphorylase has its greatest activity when blood glucose level is (high or low). Question 31 Leptin is a hormone that acts on the hypothalamus to send the following signal that: (the person is full and cells should increase energy expenditure/the person is hungry and cells will conserve energy use). Question 32 Name the enzyme that catalyzes nitrogen fixation and the unusual metal that is a part of the cofactor of this enzyme. (Separate the two answers by a comma and spell out the name of the chemical element). Question 33 The amino acid that is the biosynthetic precursor of proline and arginine is (asparagine/asparate/glutamate/glutamine/alanine)

Explanation / Answer

Question 30: Glucose will inhibit the activity of glycogen phosphorylase enzyme so when blood glucose level is low it has greatest activity

Question 31: Leptin Controls food intake and energy expenditure by acting on receptors in the mediobasal hypothalamus so it will send the signal that the person is full and should increase energy expenditure

Question 32: Nitrogenase is the enzyme responsible for nitrogen fixation.

All nitrogenases have an iron and sulfur-containing cofactor that includes an iron-sulfur cluster at the active site. In most proteins, this Fe-S cluster also contains molybdenum, in which case the active site is referred to as FeMoco. In some case, molybdenum is replaced by a vanadium or iron.

Question 33: Glutamate

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