Which cell organelle is responsible for the formation of lysosomes? MCQ with Answer and Explanation

Question
Which cell organelle is responsible for the formation of lysosomes?
A. Endoplasmic Reticulum
B. Golgi apparatus
C. Mitochondria
D. Nucleus
Answer: Option B
Solution (By JKExamLibrary)
Lysosomes are membrane-bound vesicles containing hydrolytic enzymes formed by the Golgi apparatus. The Golgi modifies, sorts, and packages proteins from the rough ER into vesicles; some become lysosomes. These organelles function in intracellular digestion and autophagy. Rough ER synthesizes enzymes, but the final packaging into lysosomes occurs at the Golgi. Hence, Golgi is sometimes called the 'traffic police' of the cell.
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Question #1
Which of the following statements is correct regarding cell theory?
A. Cells arise spontaneously.
B. Only plant cells contain cell walls.
C. All living organisms are composed of cells and products of cells.
D. All cells have a nucleus.
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Correct Answer: Option C

Explanation:
Modern cell theory states that all living organisms are composed of cells and cell products, the cell is the basic unit of structure and function, and all cells arise from pre-existing cells (Omnis cellula e cellula). Not all cells have a nucleus (e.g., prokaryotes, mature RBCs). Cell theory was formulated by Schleiden, Schwann, and Virchow. Spontaneous generation was disproved.
This question belongs to: Science Biology
Question #2
The pigment that gives carrots their orange color and is a precursor of vitamin A is:
A. Lycopene
B. Xanthophyll
C. Chlorophyll
D. Beta-carotene
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Correct Answer: Option D

Explanation:
Beta-carotene is a provitamin A carotenoid, giving orange color; the body can convert it to retinol. Lycopene is red (tomato), xanthophyll yellow, chlorophyll green. Carotenoids are accessory pigments in photosynthesis.
This question belongs to: Science Biology
Question #3
Consider statements about genetics: 1. DNA is double-stranded. 2. RNA contains thymine. 3. Genes are located on chromosomes. Which are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 1, 2 and 3
D. 2 and 3 only
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Correct Answer: Option A

Explanation:
DNA is typically a double-stranded helical molecule carrying genetic information. Genes are specific sequences of DNA located linearly on chromosomes. RNA is generally single-stranded and contains the nitrogenous base uracil instead of thymine, which is found in DNA. Therefore, statements 1 and 3 are correct, while statement 2 is incorrect.
This question belongs to: Science Biology
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