Life Science CSIR NET JRF - Cell Biology questions - Part - 2

11. Cells will usually divide if they receive the proper signal at a
(a) M (b) S
(c) G2 (d) G1

12. Dye injected into a plant cell might be able to enter an adjacent cell through a
(a) tight junction. (b) microtubule.
(c) desmosome. (d) plasmodesma.

13. A researcher made an interesting observation about a protein made by the rough ER and eventually used to build a cell’s plasma membrane. The protein in the membrane was actually slightly different from the protein made in the ER. The protein was
probably changed in the
(a) Golgi apparatus. (b) smooth ER.
(c) mitochondrion. (d) nucleus.

14. When elongated, tube-shaped cells from the lining of the intestine are treated with a certain chemical, the cells sag and become round blobs. The internal structures disrupted by this chemical are probably
(a) cell junctions. (b) microtubules.
(c) rough ER. (d) dynein.

15. The electron microscope has been particularly useful in studying bacteria, because
(a) electrons can penetrate tough bacterial cell walls.
(b) bacteria are so small.
(c) bacteria move so quickly they are hard to photograph.
(d) with few organelles present, bacteria are distinguished by differences in individual

16. Cell fractionation is the most appropriate procedure for preparing ____ for study.
(a) isolated cells which are normally found tightly attached to neighbouring cells
(b) cells without a functional cytoskeleton
(c) isolated organelles
(d) the basic macromolecules

17. Which of the following clues would tell you whether a cell is prokaryotic or eukaryotic?
(a) the presence or absence of a rigid cell wall
(b) whether or not the cell is partitioned by internal membranes
(c) the presence or absence of ribosomes
(d) whether or not the cell carries out cellular metabolism

18. Seema would like to film the movement of chromosomes during cell division. Her best choice for a microscope would be a
(a) transmission electron microscope, because of its magnifying power.
(b) scanning electron microscope, because the specimen is alive.
(c) transmission electron microscope, because of its great resolving power.
(d) light microscope, because the specimen is alive.

19. A plant cell was grown in a test tube containing radioactive nucleotides, the parts from which DNA is built. Later examination of the cell showed the radioactivity to be concentrated in the
(a) rough ER. (b) peroxisome.
(c) nucleus. (d) central vacuole.

20. When isolated liver cells are combined with nonpolar toxins initial processing in the ___ increases the solubility of these compounds as an initial step in their excretion.
(a) smooth ER (b) Golgi apparatus
(c) mitochondrion (d) rough ER

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