The organ that stores excess glucose as glycogen is the: MCQ with Answer and Explanation

Question
The organ that stores excess glucose as glycogen is the:
A. Pancreas
B. Liver
C. Muscle
D. Kidney
Answer: Option B
Solution (By JKExamLibrary)
The liver is the primary organ for glycogenesis (storing glucose as glycogen) and glycogenolysis, maintaining blood glucose levels. Muscles store glycogen for local use. Pancreas regulates via hormones, kidneys excrete excess glucose.
This question belongs to: Science Biology
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Question #1
The deficiency of vitamin B₃ (niacin) causes:
A. Beriberi
B. Rickets
C. Pellagra
D. Scurvy
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Correct Answer: Option C

Explanation:
Pellagra is characterized by dermatitis, diarrhea, dementia, and if untreated, death (the four Ds). It results from deficiency of niacin (vitamin B₃) or its precursor tryptophan. Scurvy is vitamin C deficiency, rickets vitamin D, beriberi vitamin B₁ (thiamine). Niacin is a component of coenzymes NAD and NADP, essential in redox reactions. Pellagra historically common in corn-based diets.
This question belongs to: Science Biology
Question #2
The deficiency of vitamin B₁₂ leads to which type of anemia?
A. Pernicious anemia
B. Sickle cell anemia
C. Aplastic anemia
D. Iron-deficiency anemia
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Correct Answer: Option A

Explanation:
Pernicious anemia is a megaloblastic anemia resulting from vitamin B₁₂ (cobalamin) deficiency, often due to lack of intrinsic factor (produced by stomach parietal cells) needed for its absorption. It is characterized by large, immature red blood cells and neurological symptoms. Iron deficiency causes microcytic anemia. Sickle cell is genetic, aplastic is bone marrow failure.
This question belongs to: Science Biology
Question #3
Assertion (A): Red blood cells lack a nucleus in mammals.
Reason (R): The absence of a nucleus allows more space for hemoglobin, increasing oxygen-carrying capacity.
A. Both A and R are true, but R is not the correct explanation.
B. A is false, but R is true.
C. Both A and R are true, and R is the correct explanation of A.
D. A is true, but R is false.
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Correct Answer: Option C

Explanation:
Mature mammalian RBCs are anucleate, having lost their nucleus during maturation. This provides more space for hemoglobin, enhancing oxygen transport. The reason correctly explains the assertion. Nucleated RBCs are found in other vertebrates.
This question belongs to: Science Biology
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