All Free Biology MCQs with Answers
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19844 questions · page 610 of 1985
6091. Identify the correct pair from the following options:
- A. DNA replication-Ribosome
- B. Protein synthesis-SER
- C. Anaerobic respiration-Cristae
- D. Modification-Golgi apparatus
Explanation: DNA replication occurs in nucleus, proteins are synthesized by RER and anaerobic respiration occurs in cytoplasm. Chemical modification of biological molecules is the function of Golgi apparatus.
Correct answer: Modification-Golgi apparatus6092. Golgi complex is involved in the formation of _ .
- A. Lysosomes
- B. RER
- C. Vacuoles
Explanation: lysosomes are formed through the Golgi complex, depending on the type of cell and its function.
Correct answer: Lysosomes6093. The transport of secretory proteins takes place through organelles in which of the following order?
- A. RER-SER-Golgi apparatus -Secretory vesicles
- B. SER-RER -Golgi apparatus-Secretory vesicles
- C. RER-SER-Secretory vesicles-Golgi apparatus
- D. RER-Golgi apparatus-Secretory vesicles-SER
Explanation: Proteins are synthesized on RER, and then they are transported in with the help of SER. The modification of these proteins is done in the Golgi complex. Modified proteins are transported out of the cell in the form of secretory vesicles.
Correct answer: RER-SER-Golgi apparatus -Secretory vesicles6094. Strictly speaking, autophagosomes are actually
- A. Primary lysosomes
- B. Secondary lysosomes
- C. Tertiary lysosomes
- D. None of the above
Explanation: Autophagosomes are secondary lysosomes which are formed by fusion of primary lysosome with autophagic vesicles. The process is known as autophagocytosis in which unwanted structures within the cell are engulfed. This process occurs during starvation or it occurs in routine to control number of specific organelles.
Correct answer: Secondary lysosomes6095. It is a disease characterized by the accumulation of lipids in the brain cells leading to:
- A. Grave's disease
- B. Addison's disease
- C. Glycogenosis type Il disease
- D. Tay-Sachs disease
Explanation: Storage diseases are due to the absence of lysosomal enzymes. If a lysosomal enzyme responsible for lipid metabolism is absent, it leads to the accumulation of lipids in brain cells which causes mental retardation and death, such storage disease is known as Tay-Sachs disease.
Correct answer: Tay-Sachs disease6096. What is the specific name given to the biological membrane that surrounds the vacuoles?
- A. Plasma membrane
- B. Endomembrane
- C. Plasmalemma
- D. Tonoplast
Explanation: Vacuole is single membrane bounded organelle. This single membrane around vacuole is known as tonoplast.
Correct answer: Tonoplast6097. Which of the following proteins is present in microtubules?
- A. Tubulin
- B. Myosin
- C. Actin
- D. Tropomyosin
Explanation: Tubulin is the most abundant protein found in microtubules while myosin, actin and tropomyosin are found in microfilaments.
Correct answer: Tubulin6098. All of the following proteins are present in microfilaments of skeletal muscle cell except:
- A. Tubulin
- B. Actin
- C. Myosin
- D. Tropomyosin
Explanation: Actin myosin and tropomyosin are found in microfilaments of muscle cells while tubulin is found in microtubules.
Correct answer: Tubulin6099. Number of centrioles in a cell after completion of G2 phase and during metaphase of mitosis is_ and_ respectively.
- A. 2,2
- B. 2,4
- C. 4,4
- D. 4,2
Explanation: A typical non-dividing animal cell has 2 centrioles. Duplication of centrioles occurs during G2 phase so after G2 it becomes 4. During metaphase, each pole of the cell has a pair of centrioles, i.e 4 as total.
Correct answer: 4,46100. Which of the following cell organelle can be viewed with the help of a high power light microscope?
- A. Endoplasmic reticulum
- B. Ribosomes
- C. Mitochondria
- D. Golgi apparatus
Explanation: Due to the large size of chloroplast as compared to endoplasmic reticulum, Golgi apparatus and ribosomes, it can be visualized easily with the help of light microscope.
Correct answer: Mitochondria