MC - Biochemistry Quiz - L8-L11

Which of the following is an aldotriose?

Dihydroxyacetone

Glyceraldehyde

Ribulose

Erythrose

The major free energy sources for anabolic pathways are

ATP and NADPH

ADP and NADPH.

ATP and NADP+.

ADP and NADP+

AMP or NADPH.

An example of DIRECT cell communication is:

Neurons communicating across a synapse

Hormones traveling through the blood stream to target tissues

White blood cells bumping into each other sharing antigen info

Whenever the cell’s ATP supply is depleted, which of the following enzyme’s activity is increased?

Hexokinase

Phosphofructokinase-1

Glucokinase

Pyruvate kinase

Which of the following is a sugar alcohol?

Arabitol

Manitol

Sorbitol

All of these

The __________ law of thermodynamics states that entropy is always increasing

First

Third

Second

Zeroth

An allosteric inhibitor of an enzyme usually

binds to the active site.

Participates in feedback regulation.

Denatures the enzyme.

Causes the enzyme to work faster.

Which enzyme are used in liver function test (LFT)

AST

GGT

ALT

Assume that the reaction catalyzed by an enzyme follows Michaelis-Menten kinetics. The substrate concentration (Km, Michaelis constant) needed to reach 50% of the maximum reaction velocity (Vmax) is 25 μM. What substrate concentration is required to obtain at least 95% of the maximum reaction velocity?

25 μM

50 μM

475 μM

250 μM

Which of the following is an epimeric pair?

D-glucose and D-mannose

D-glucose and D-galactose

D-glucose and L-glucose

Both A and B

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