Which of the following statements about viruses is INCORRECT? MCQ with Answer and Explanation

Which of the following statements about viruses is INCORRECT?
A. They are obligate intracellular parasites.
B. They can have either DNA or RNA as genetic material.
C. They lack metabolic machinery.
D. They reproduce by binary fission.
Answer: Option D
Solution (By JKExamLibrary)
Viruses do not reproduce by binary fission; they replicate by hijacking host cell machinery. Binary fission is a method of asexual reproduction in bacteria. All other statements are correct.

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Practice More Biology Questions

Question #1
The condition in which the blood does not clot properly due to deficiency of clotting factor VIII is:
A. Thalassemia
B. Anemia
C. Hemophilia A
D. Leukemia

Correct Answer: Option C


Explanation:
Hemophilia A is an X-linked recessive bleeding disorder caused by deficiency of factor VIII. Hemophilia B is factor IX deficiency. Anemia is low RBCs, thalassemia abnormal hemoglobin, leukemia cancer of WBCs.

This question belongs to: Science Biology
Question #2
Which part of the nephron is primarily involved in the reabsorption of glucose and amino acids?
A. Proximal convoluted tubule
B. Distal convoluted tubule
C. Collecting duct
D. Loop of Henle

Correct Answer: Option A


Explanation:
The proximal convoluted tubule (PCT) reabsorbs about 70-80% of electrolytes and water, and almost 100% of glucose, amino acids, and vitamins back into the blood via active transport and facilitated diffusion. The loop of Henle concentrates urine, the DCT reabsorbs sodium and water under hormonal control, and the collecting duct reabsorbs water (ADH-dependent). PCT cells have microvilli for increased surface area.

This question belongs to: Science Biology
Question #3
Which of the following organisms is included in the Kingdom Monera?
A. Amoeba
B. Mushroom
C. Cyanobacteria
D. Yeast

Correct Answer: Option C


Explanation:
Kingdom Monera includes all prokaryotic organisms, which lack a true nucleus and membrane-bound organelles. Cyanobacteria (blue-green algae) are prokaryotes and thus belong to Monera. Amoeba is a protist, while yeast and mushrooms are fungi, which belong to the Kingdom Fungi and are eukaryotic.

This question belongs to: Science Biology