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MCQS SEM-3 2025-2026

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

The primary source of energy for brain cells is:

a)

Protein

b)

Glucose

c)

Fatty acids

d)

Ketone bodies

2.

Which lipid is a compound lipid?

a)

Triglyceride

b)

Phospholipid

c)

Sterol

d)

Fatty acid

3.

Beta-oxidation of fatty acids occurs in the:

a)

Cytoplasm

b)

Mitochondria

c)

Lysosomes

d)

Nucleus

4.

The TCA cycle is amphibolic because it:

a)

Only produces ATP

b)

Only oxidizes fats

c)

Has anabolic & catabolic roles

d)

Occurs in cytosol

5.

A double bond in fatty acid denotes:

a)

Saturation

b)

Unsaturation

c)

Hydrogenation

d)

Oxidation

6.

A person on low-carb diet develops ketosis because:

a)

Fat is converted to glucose

b)

Excess glucose forms ketones

c)

Fat oxidation is incomplete

d)

Protein forms lactate

7.

Which step connects glycolysis and TCA cycle?

a)

Acetyl-CoA formation

b)

Glucose phosphorylation

c)

ATP synthesis

d)

NAD reduction

8.

Why does TCA cycle yield more ATP than glycolysis?

a)

Occurs in cytoplasm

b)

Produces more NADH/FADH₂

c)

Directly forms ATP

d)

Uses more glucose

9.

Deficiency of essential fatty acids causes:

a)

Delayed blood clotting

b)

Scaly skin and poor wound healing

c)

Edema

d)

Fat malabsorption

10.

The liver regulates blood glucose mainly through:

a)

Glycogenesis

b)

Glycolysis

c)

Gluconeogenesis

d)

All of these

11.

A protein loses its shape but not its sequence during:

a)

Digestion

b)

Denaturation

c)

Deamination

d)

Decarboxylation

12.

Which enzyme starts protein digestion in the stomach?

a)

Trypsin

b)

Pepsin

c)

Erepsin

d)

Lipase

13.

Decarboxylation of amino acids produces:

a)

Urea

b)

Fatty acids

c)

Amines

d)

Alcohols

14.

A child with swollen belly and thin limbs likely suffers from:

a)

Marasmus

b)

Scurvy

c)

Kwashiorkor

d)

Pellagra

15.

Which amino acid is essential for infants but not adults?

a)

Lysine

b)

Arginine

c)

Tryptophan

d)

Tyrosine

16.

A diet combining cereal and pulse improves:

a)

Vitamin C

b)

Supplementary value

c)

Mineral content

d)

Fiber intake

17.

Why is the biological value of egg protein high?

a)

It's cheap

b)

Easily digested

c)

Has all essential amino acids

d)

Rich in carbs

18.

When dietary protein intake exceeds requirement, excess amino acids are:

a)

Stored as protein

b)

Excreted directly

c)

Converted to glucose or fat

d)

Retained in muscle

19.

The peptide bond in proteins forms between:

a)

COOH of one and NH₂ of another amino acid

b)

Two NH₂ groups

c)

Two COOH groups

d)

OH and COOH groups

20.

Conversion of amino acids to glucose occurs by:

a)

Lipogenesis

b)

Glycolysis

c)

Gluconeogenesis

d)

Ketogenesis

21.

DNA double helix is stabilized mainly by:

a)

Peptide bonds

b)

Hydrogen bonds

c)

Ionic bonds

d)

Sulphur bridges

22.

Which RNA acts as an adapter molecule?

a)

mRNA

b)

tRNA

c)

rRNA

d)

hnRNA

23.

Enzymes are chemically:

a)

Carbohydrates

b)

Proteins

c)

Lipids

d)

Vitamins

24.

Increasing enzyme concentration (with excess substrate) results in:

a)

No change

b)

Increased velocity

c)

Decreased velocity

d)

Denaturation

25.

The substrate concentration at half-maximal velocity is:

a)

Vmax

b)

Km

c)

Ka

d)

Ki

26.

The hormone regulating basal metabolic rate is:

a)

Thyroxine

b)

Cortisol

c)

Aldosterone

d)

Oxytocin

27.

If parathyroid glands are removed, what imbalance occurs?

a)

Hyperglycemia

b)

Hypocalcemia

c)

Hyponatremia

d)

Hyperkalemia

28.

Complementary base pairing in DNA occurs between:

a)

A–C and G–T

b)

A–T and G–C

c)

A–G and T–C

d)

A–U and G–C

29.

The hormone promoting sodium reabsorption and potassium excretion is:

a)

Insulin

b)

Aldosterone

c)

Cortisol

d)

Adrenaline

30.

RNA is more reactive than DNA because it:

a)

Contains thymine

b)

Lacks ribose

c)

Contains 2'-OH group

d)

Is single stranded

31.

The active form of Vitamin D is:

a)

Cholecalciferol

b)

Calcitriol

c)

Ergocalciferol

d)

Tocopherol

32.

Which vitamin is essential for prothrombin synthesis?

a)

Vitamin A

b)

Vitamin D

c)

Vitamin K

d)

Vitamin E

33.

Xerophthalmia results from deficiency of:

a)

Vitamin E

b)

Vitamin K

c)

Vitamin A

d)

Vitamin D

34.

Riboflavin is Vitamin:

a)

B1

b)

B2

c)

B3

d)

B6

35.

Vitamin B12 is essential for:

a)

Collagen synthesis

b)

DNA synthesis & RBC formation

c)

Antioxidant defense

d)

Vision

36.

Folate deficiency in pregnancy causes:

a)

Spina bifida

b)

Rickets

c)

Night blindness

d)

Beriberi

37.

Pyridoxine (B6) is involved in:

a)

Transamination reactions

b)

DNA replication

c)

Collagen cross-linking

d)

Fat absorption

38.

Zinc deficiency affects:

a)

Growth & immune function

b)

Vision

c)

Bone mineralization

d)

Blood coagulation

39.

Selenium acts as:

a)

Cofactor for DNA polymerase

b)

Antioxidant via glutathione peroxidase

c)

Blood clotting factor

d)

Vitamin coenzyme

40.

Thiamine deficiency affects which metabolic pathway most?

a)

Fatty acid β-oxidation

b)

Pyruvate → Acetyl-CoA (PDH)

c)

Gluconeogenesis from glycerol

d)

Glycogen synthesis

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