The element that is a central component of the chlorophyll molecule is: MCQ with Answer and Explanation

Question
The element that is a central component of the chlorophyll molecule is:
A. Calcium
B. Iron
C. Magnesium
D. Zinc
Answer: Option C
Solution (By JKExamLibrary)
Magnesium (Mg²⁺) is the central atom in the porphyrin ring of chlorophyll, essential for absorbing light energy during photosynthesis. Iron is central in heme (hemoglobin, cytochromes). Calcium is a secondary messenger and structural component, zinc is a cofactor. Magnesium deficiency causes chlorosis.
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Question #1
The disease characterized by the inflammation of the liver caused by a virus is:
A. Cirrhosis
B. Hepatitis
C. Nephritis
D. Pancreatitis
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Correct Answer: Option B

Explanation:
Hepatitis (A, B, C, etc.) is liver inflammation, often viral. Symptoms include jaundice, fatigue, and liver enzyme elevation. Cirrhosis is liver scarring, pancreatitis is pancreatic inflammation, nephritis is kidney inflammation. Hepatitis B and C can become chronic and lead to liver cancer.
This question belongs to: Science Biology
Question #2
The process of making a complementary DNA (cDNA) from mRNA using reverse transcriptase is called:
A. Replication
B. Reverse transcription
C. Translation
D. Transformation
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Correct Answer: Option B

Explanation:
Reverse transcription synthesizes DNA from an RNA template, catalyzed by reverse transcriptase in retroviruses and used in molecular biology for cDNA synthesis.
This question belongs to: Science Biology
Question #3
Identify the INCORRECT statement about the human body:
A. The skin is the largest organ.
B. The liver is the largest gland.
C. The femur is the longest bone.
D. The heart is located on the right side of the chest.
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Correct Answer: Option D

Explanation:
The heart is situated in the mediastinum slightly left of the midline. All other statements are true.
This question belongs to: Science Biology
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