Consider statements about human anatomy: 1. The heart has four chambers. 2. The lungs are the primary organs of respiration. 3. The brain is protected by the skull. Which are correct? MCQ with Answer and Explanation

Question

Consider statements about human anatomy: 1. The heart has four chambers. 2. The lungs are the primary organs of respiration. 3. The brain is protected by the skull. Which are correct?

A. 2 and 3 only

B. 1, 2 and 3

C. 1 and 3 only

D. 1 and 2 only

Answer: Option B

Solution (By JKExamLibrary)

The human heart is a four-chambered muscular organ consisting of two upper atria (receiving chambers) and two lower ventricles (discharging chambers), ensuring complete separation of oxygenated and deoxygenated blood. The lungs are a pair of spongy, air-filled organs located on either side of the chest, serving as the primary site for gas exchange (respiration). The brain, the control center of the nervous system, is encased and protected by the bony cranium (skull). All statements are correct.

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Which of the following conditions is characterized by the presence of ketone bodies in urine, often associated with diabetes mellitus?

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B. Proteinuria

C. Ketonuria

D. Glycosuria

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Correct Answer: Option C

Explanation:
Ketonuria is the presence of ketone bodies (acetoacetate, beta-hydroxybutyrate, acetone) in urine, resulting from increased fat metabolism due to carbohydrate unavailability in uncontrolled diabetes mellitus. Glycosuria is glucose in urine, proteinuria is protein, hematuria is blood. Ketonuria indicates diabetic ketoacidosis, a medical emergency requiring immediate treatment.

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Question #2

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Identify the INCORRECT statement about bacteria:

A. All bacteria are pathogenic.

B. They are prokaryotic.

C. They reproduce by binary fission.

D. They have a cell wall made of peptidoglycan.

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Correct Answer: Option A

Explanation:
Not all bacteria cause disease; many are beneficial (e.g., nitrogen fixers, gut flora). The other statements are true.

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Lysosomes are rich in which type of enzymes?

A. Oxidoreductases

B. Hydrolytic enzymes

C. Isomerases

D. Transferases

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Correct Answer: Option B

Explanation:
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