All Free Biology MCQs with Answers
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19844 questions · page 688 of 1985
6871. Nuclear outer membrane is continuous with:
- A. ER
- B. Golgi bodies
- C. Centrioles
- D. Lysosome
Explanation: The endoplasmic reticulum is often continuous with the plasma membrane and also appears to be in contact with the nuclear membrane when viewed through an electron microscope.
Correct answer: ER6872. The exact replica of chromosome is:
- A. Chromatid
- B. Chromatin
- C. Centromere
- D. Plasmid
Explanation: A chromatid is one of the two identical halves of the chromosome that has been replicated in preparation for cell division.
Correct answer: Chromatid6873. Nucleus is stained with:
- A. Basic dyes
- B. Neutral dyes
- C. Acidic dyes
- D. Gram stain
Explanation: Nucleus is often deeply stained with basic dyes. This is because of presence of the chromatin material. Haematoxylin stains basophilic substances. Hence, hematoxylin is commonly used to stain the nucleus.
Correct answer: Basic dyes6874. In muscle cells, which of these conduct impulses?
- A. Nucleus
- B. Cytoplasm
- C. Golgi bodies
- D. Smooth ER
Explanation: In muscle cells, smooth ER is called sarcoplasmic reticulum. It stores calcium ions that are essential for nerve impulse conduction. Hence, smooth ER is involved in the conduction of nerve impulses.
Correct answer: Smooth ER6875. These are stacks of flattened membrane bounded sacs:
- A. Lysosome
- B. Endoplasmic reticulum
- C. Cisternae
- D. Nucleus
Explanation: The stack of flattened membrane-bounded sacs is called cisternae. Golgi apparatus consists of these stacks.
Correct answer: Cisternae6876. In pancreas, granules containing enzymes are secreted by:
- A. Golgi bodies
- B. Endoplasmic reticulum
- C. Ribosome
- D. Lysosome
Explanation: One of the most important functions of Golgi apparatus is cell secretions. Hence, Golgi apparatus is responsible for the secretion of granules containing enzymes by pancreas.
Correct answer: Golgi bodies6877. It controls life and activities of cell:
- A. Nucleus
- B. Mitochondria
- C. Chloroplast
- D. ER
Explanation: Nucleus contains all the genetic information of the cell. It is called the brain of cell. It controls all the life activites of the cell.
Correct answer: Nucleus6878. The functional unit of Golgi apparatus is:
- A. Thylakoids
- B. Oxysomes
- C. Cristae
- D. Cisternae
Explanation: Golgi apparatus consists of stacks of flattened membrane-bound sacs called cisternae. Cisternae is the functional unit of Golgi apparatus.
Correct answer: Cisternae6879. How many of the following are membrane-bounded organelles? Mitochondria, centrioles, nucleolus, nucleus, chloroplast, ribosomes.
- A. 6
- B. 4
- C. 3
- D. 5
Explanation: Only three of the above-mentioned organelles are membrane-bounded. Nucleus, mitochondria, and chloroplast are membrane-bounded organelles. However, ribosomes, centrioles, and nucleolus are not bound by any membrane.
Correct answer: 36880. The intake of liquid material by cell membrane by forming vacuole is:
- A. Phagocytosis
- B. Endocytosis
- C. Pinocytosis
- D. Exocytosis
Explanation: The intake of liquid material by the cell membrane in the form of vacuole is called pinocytosis.
Correct answer: Pinocytosis