Which lipoprotein has the highest ratio of protein to lipid?

The correct answer is D: HDL. HDL has approximately 50% protein content, the highest among all lipoproteins. Chylomicrons and VLDL are triglyceride-rich lipoproteins with lower protein ratios.

Which of the following describes cooperative binding in enzymes?

The correct answer is A: Binding of substrate increases affinity for subsequent substrates. Cooperative binding (positive cooperativity) occurs when binding of one substrate molecule enhances the affinity of the enzyme for additional substrate molecules, as seen in hemoglobin and phosphofructokinase.

In the Pasteur effect, the inhibition of glycolysis by oxidative phosphorylation is primarily mediated by which molecule(s)?

The correct answer is D: All of the above. The Pasteur effect describes how aerobic respiration inhibits glycolysis through multiple mechanisms: increased ATP/AMP ratio (inhibiting PFK-1), increased NADH/NAD⁺ ratio (inhibiting GAPDH), and increased citrate (allosteric inhibitor of PFK-1). This explains why cells prefer oxidative metabolism w

The disaccharide formed by α-glucose and β-fructose joined by α-1,2-glycosidic bond is:

The correct answer is C: Sucrose. Sucrose is composed of glucose and fructose linked by α-1,2-glycosidic bond. Maltose has α-1,4 bond between two glucose molecules.

In the context of lipid metabolism, what does beta-oxidation primarily accomplish?

The correct answer is B: Breaking down fatty acids into acetyl-CoA for energy production. Beta-oxidation is the catabolic pathway that breaks down fatty acids in the mitochondria, producing acetyl-CoA which enters the Krebs cycle for ATP production.

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Biochemistry
Lipids

Metabolic pathways, enzymes, proteins

22 Q 3 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–22 of 22

Topics in Biochemistry

All Proteins & Enzymes 100 Carbohydrates 100 Lipids 78

Q.21 Hard Lipids

In the mobilization of fatty acids from adipose tissue, which hormone plays the primary regulatory role?

A Insulin

B Epinephrine and glucagon

C Thyroxine

D Prolactin

Correct Answer: B. Epinephrine and glucagon

EXPLANATION

Epinephrine and glucagon activate hormone-sensitive lipase via cAMP signaling in adipose tissue, promoting lipolysis and release of free fatty acids during fasting or stress.

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Q.22 Hard Lipids

A clinical test shows high triglycerides and low HDL cholesterol. What metabolic condition might be indicated?

A Ideal lipid profile

B Metabolic syndrome with insulin resistance

C Hypercholesterolemia only

D Vitamin D deficiency

Correct Answer: B. Metabolic syndrome with insulin resistance

EXPLANATION

High triglycerides with low HDL is characteristic of metabolic syndrome, often associated with insulin resistance, obesity, and increased cardiovascular risk.

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