Which of the following is an example of an animal cell that lacks a nucleus in its mature form? MCQ with Answer and Explanation

Question
Which of the following is an example of an animal cell that lacks a nucleus in its mature form?
A. Leukocyte
B. Hepatocyte
C. Erythrocyte (human RBC)
D. Neuron
Answer: Option C
Solution (By JKSSB Mock Tests)
Mature mammalian red blood cells (erythrocytes) lose their nucleus and other organelles during development to maximize space for hemoglobin. Thus they are anucleate. They cannot divide or repair themselves and have a lifespan of about 120 days. Neurons, leukocytes, and hepatocytes are nucleated. RBCs obtain energy through anaerobic glycolysis.
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Question #1
Assertion (A): The Krebs cycle occurs in the mitochondrial matrix.
Reason (R): The enzymes for the Krebs cycle are soluble in the matrix.
A. A true, R false.
B. A false, R true.
C. Both A and R are true, but R is not the correct explanation.
D. Both A and R are true, and R is the correct explanation.
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Correct Answer: Option D

Explanation:
The mitochondrial matrix contains all Krebs cycle enzymes (except succinate dehydrogenase). Thus, the location is due to enzyme presence. R correctly explains A.
This question belongs to: Science Biology
Question #2
Which of the following diseases is caused by a protozoan?
A. Tuberculosis
B. Measles
C. Kala-azar
D. Tetanus
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Correct Answer: Option C

Explanation:
Kala-azar (visceral leishmaniasis) is caused by the protozoan Leishmania donovani, transmitted by sandfly bite. Tetanus is bacterial (Clostridium tetani), tuberculosis bacterial (Mycobacterium tuberculosis), measles viral. Protozoan diseases include malaria, amoebiasis, sleeping sickness, giardiasis. Kala-azar causes fever, weight loss, splenomegaly, and is endemic in parts of India.
This question belongs to: Science Biology
Question #3
Identify the INCORRECT statement about the human reproductive system:
A. The Cowper’s glands secrete mucus for lubrication.
B. The seminal vesicles secrete a fructose-rich fluid.
C. The scrotum maintains testes temperature lower than body temperature.
D. Spermatogenesis occurs in the epididymis.
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Correct Answer: Option D

Explanation:
Spermatogenesis occurs in the seminiferous tubules of the testes. The epididymis stores and matures sperm. So D is incorrect.
This question belongs to: Science Biology
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