What is the structural arrangement of microtubules in a centriole? MCQ with Answer and Explanation

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What is the structural arrangement of microtubules in a centriole?

A. 9+2

B. 6+6

C. 9+0

D. 9+1

Answer: Option C

Solution (By JKExamLibrary)

Centrioles are cylindrical structures composed of nine evenly spaced peripheral fibrils of tubulin, arranged in a 9+0 pattern. Each fibril is a triplet of microtubules. The central part is non-branched and lacks microtubules. Centrioles are involved in forming the spindle apparatus in animal cells and basal bodies of cilia and flagella.

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Question #1

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Consider the following statements about blood:
1. Red blood cells transport oxygen.
2. White blood cells are involved in immunity.
3. Platelets help in blood clotting.
Which of the above is/are correct?

A. 1 and 3 only

B. 2 and 3 only

C. 1, 2, and 3

D. 1 and 2 only

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Correct Answer: Option C

Explanation:
All three statements are correct: RBCs contain hemoglobin for oxygen transport, WBCs (leukocytes) defend against pathogens, and platelets (thrombocytes) initiate blood clotting.

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Question #2

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The organism that causes citrus canker is:

A. Bacterium

B. Fungus

C. Mycoplasma

D. Virus

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Correct Answer: Option A

Explanation:
Citrus canker is a bacterial disease caused by Xanthomonas citri (syn. X. axonopodis pv. citri). It produces raised necrotic lesions on leaves, fruit, and stems, causing defoliation and reduced yield. It spreads via rain splash and contaminated tools. No viral or fungal causal agent.

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Question #3

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The functional unit of the human kidney where filtration occurs is the:

A. Distal tubule

B. Bowman's capsule

C. Renal corpuscle

D. Loop of Henle

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Correct Answer: Option C

Explanation:
The renal corpuscle consists of the glomerulus (capillary tuft) and Bowman's capsule. This is where ultrafiltration of blood occurs. The filtrate then passes through the proximal tubule, loop of Henle, distal tubule, and collecting duct. The loop of Henle concentrates urine, the tubules reabsorb and secrete. The nephron is the complete functional unit.

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