All Free Biology MCQs with Answers
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19844 questions · page 619 of 1985
6181. Suggest which among the following is not a function attributed to endoplasmic reticulum?
- A. Detoxification of poisons and drugs
- B. Digestion/egestion of foreign materials outside the cell
- C. Manufacture of fat and lipid molecules
- D. Biogenesis of membrane proteins
Explanation: The endoplasmic reticulum is involved in the detoxification of the poisons and the drugs. This is the main function of the endoplasmic reticulum in the liver. The manufacturing of the lipids and fat molecules take place in the smooth ER. The membrane proteins are synthesised on the ribosomes which are present on the surface of the ER. The digestion and egestion of the foreign materials which enter the cells take place in the lysosomes. Thus, the correct answer is option B.
Correct answer: Digestion/egestion of foreign materials outside the cell6182. Its membranes are the sites where sunlight energy is trapped and where glucose is formed. Which organelle is this?
- A. Chloroplast
- B. Leucoplast
- C. Chromoplast
- D. Cytosol
Explanation: Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process.
Correct answer: Chloroplast6183. Tay Sach's disease is caused by absence of enzyme required to breakdown _.
- A. Lipids
- B. Glycogen
- C. Glucose
- D. Proteins
Explanation: Tay-Sachs disease is a inherited disorder that progressively destroys nerve cells (neurons) in the brain and spinal cord. It is caused due to the mutation in the gene which is responsible for producing enzyme involved break down of fatty substance.
Correct answer: Lipids6184. The process of membrane fusion and the movement of material out of the cell, is called:
- A. Phagocytosis
- B. Endocytosis
- C. Pinocytosis
- D. Exocytosis
Explanation: The process of moving substances out of the cell is called exocytosis.Endocytosis is moving substances into the cell.Phagocytosis is movement of substances into the cell which are solid and massive.Pinocytosis is movement of substances into the cell in liquid state.
Correct answer: Exocytosis6185. Chief material present in the cell wall of plants, fungal, and prokaryotic cells is:
- A. Proteins
- B. Lipids
- C. Polysaccharides
- D. Phospholipids
Explanation: The primary cell wall of land plants is composed of polysaccharides, cellulose, hemicelluloses, and pectin.
Correct answer: Polysaccharides6186. Fibers of the extracellular matrix are attached to _ in the plasma membrane.
- A. Phospholipids
- B. Carbohydrates
- C. Glycolipids
- D. Proteins
Explanation: A network of collagen fibers and proteoglycans is found outside of the cell. Collagen connects to integrin proteins in the plasma membrane via fibronectin. On the inside of the cell, the integrins link up to the microfilaments of the cytoskeleton.
Correct answer: Proteins6187. _ organelles are involved in the synthesis of the plant cell wall.
- A. Endoplasmic reticulum
- B. Golgi complex
- C. Lysosomes
- D. Peroxisomes
Explanation: The Golgi and plasma membranes are the two main sites, where constituents of the cell wall are synthesized.
Correct answer: Golgi complex6188. The basic structural framework of all types of membranes are:
- A. Phospholipids
- B. Glycoproteins
- C. Lipoproteins
- D. Nucleoproteins
Explanation: Lipoproteins formed by the combination of lipids and proteins serve as the basic structural framework of all types of membranes in the cells.
Correct answer: Lipoproteins6189. Which one of the following combinations is NOT the part of an animal cell?
- A. Central Vacuole, Cell Membrane, Ribosomes
- B. Chloroplast, Ribosome , Mitochondria
- C. Cell wall, Chloroplast, Central vacuole
- D. Ribosome, Mitochondria, Cell wall
Explanation: Animal cells do not have a Cell wall and Chloroplasts. They have temporary small vacuoles; unlike plant cells which have large, permanent, central vacuoles.
Correct answer: Cell wall, Chloroplast, Central vacuole6190. Which of the following offers an active barrier between the cell content and their environment by allowing only selective substances to pass through it?
- A. Cell wall
- B. Plasma membrane
- C. Nuclear membrane
- D. Vacuole
Explanation: Selectively permeable means only substances that are needed in the cell are allowed to pass through Option A: Cell wall is fully permeable Option B: Plasma membrane (cell membrane) is partially permeable and allows only those substances to pass through which are required by the cell Option C: It is the membrane of the nucleus and allows only required substances to pass through to the nucleus Option D: A vacuole is a membrane-bound cell organelle. In animal cells, vacuoles are generally small and help sequester waste products. In plant cells, vacuoles help maintain water balance. Sometimes a single vacuole can take up most of the interior space of the plant cell
Correct answer: Plasma membrane