Question 61:
Which of the following organelles is involved in lipid metabolism?
A) Ribosome
B) Rough Endoplasmic Reticulum
C) Smooth Endoplasmic Reticulum
D) Golgi Apparatus
Answer: C) Smooth Endoplasmic Reticulum
Explanation: The smooth endoplasmic reticulum is responsible for lipid synthesis and metabolism, as well as detoxifying harmful substances.
Question 62:
What is the function of the cell wall in bacteria?
A) Energy production
B) Protection and shape
C) Protein synthesis
D) Storage of genetic material
Answer: B) Protection and shape
Explanation: The bacterial cell wall provides structural support, protection against physical damage, and maintains the shape of the cell.
Question 63:
Which of the following statements about cell division is true?
A) Meiosis produces genetically identical cells.
B) Mitosis occurs only in reproductive cells.
C) Meiosis results in haploid cells.
D) Mitosis does not involve DNA replication.
Answer: C) Meiosis results in haploid cells.
Explanation: Meiosis is the process of cell division that produces haploid gametes, which have half the number of chromosomes as the original cell.
Question 64:
Which organelle is known for its role in the detoxification of drugs in liver cells?
A) Mitochondria
B) Smooth Endoplasmic Reticulum
C) Lysosome
D) Golgi Apparatus
Answer: B) Smooth Endoplasmic Reticulum
Explanation: The smooth endoplasmic reticulum is involved in the detoxification of drugs and poisons, especially in liver cells.
Question 65:
What is the function of the plasma membrane?
A) Energy production
B) Regulation of substances entering and leaving the cell
C) Protein synthesis
D) Storage of genetic information
Answer: B) Regulation of substances entering and leaving the cell
Explanation: The plasma membrane acts as a selective barrier, controlling the entry and exit of substances to maintain homeostasis within the cell.
Question 66:
Which of the following is NOT a function of the endoplasmic reticulum?
A) Synthesis of proteins
B) Synthesis of lipids
C) Detoxification of drugs
D) DNA replication
Answer: D) DNA replication
Explanation: The endoplasmic reticulum is involved in protein and lipid synthesis, but DNA replication occurs in the nucleus.
Question 67:
Which structure helps in the movement of chromosomes during cell division?
A) Golgi Apparatus
B) Centrioles
C) Nucleus
D) Ribosomes
Answer: B) Centrioles
Explanation: Centrioles are involved in organizing the spindle fibers that separate chromosomes during cell division.
Question 68:
What is the role of the cytoskeleton in a cell?
A) Provides energy
B) Maintains cell shape and aids in movement
C) Synthesizes proteins
D) Stores genetic information
Answer: B) Maintains cell shape and aids in movement
Explanation: The cytoskeleton is a network of fibers that provides structural support, maintains cell shape, and facilitates cell movement.
Question 69:
Which type of RNA is involved in bringing amino acids to the ribosome during translation?
A) mRNA
B) tRNA
C) rRNA
D) sRNA
Answer: B) tRNA
Explanation: Transfer RNA (tRNA) carries specific amino acids to the ribosome, matching them to the corresponding codons on the mRNA during protein synthesis.
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