Which of the following is an example of innate immunity? MCQ with Answer and Explanation

Question
Which of the following is an example of innate immunity?
A. Memory T cells
B. Passive immunity from mother's milk
C. Physical barriers like skin and mucous membranes
D. Antibodies produced after vaccination
Answer: Option C
Solution (By JKSSB Mock Tests)
Innate immunity is the non-specific, inborn defense mechanism present from birth. It includes physical barriers (skin, mucous membranes), physiological barriers (stomach acid, tears), cellular barriers (neutrophils, macrophages), and cytokine barriers (interferons). Antibodies and memory cells are part of acquired (adaptive) immunity.
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Question #1
Identify the correct statement about glycolysis:
A. It produces 36 ATP per glucose.
B. It converts glucose into two pyruvate molecules.
C. It requires oxygen.
D. It occurs in the mitochondrial matrix.
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Correct Answer: Option B

Explanation:
Glycolysis breaks one glucose into two pyruvate, yielding 2 ATP and 2 NADH. It occurs in cytoplasm and is anaerobic.
This question belongs to: Science Biology
Question #2
The botanical name of the potato plant is:
A. Capsicum annuum
B. Solanum tuberosum
C. Lycopersicon esculentum
D. Solanum melongena
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Correct Answer: Option B

Explanation:
Solanum tuberosum is the scientific name of potato, a member of the Solanaceae family. Solanum melongena is brinjal (eggplant), Capsicum annuum is chili, and Lycopersicon esculentum is tomato. Potato is a tuber (modified stem) rich in starch, and is one of the world's major food crops.
This question belongs to: Science Biology
Question #3
The scientist who demonstrated that DNA replication is semi-conservative was:
A. Watson and Crick
B. Meselson and Stahl
C. Chargaff
D. Hershey and Chase
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Correct Answer: Option B

Explanation:
Matthew Meselson and Franklin Stahl, in 1958, used density gradient centrifugation of E. coli grown in N¹⁵ medium to prove that DNA replication is semi-conservative: each new DNA molecule consists of one old and one new strand. Watson and Crick proposed the double helix, Hershey-Chase confirmed DNA as genetic material, Chargaff formulated base pair rules.
This question belongs to: Science Biology
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