Most of a cell\'s time is spent in a) interphase b) prophase c) metaphase d) ana

Question

Most of a cell's time is spent in a) interphase b) prophase c) metaphase d) anaphase e) telophase Which is most closely associated with Calvin cycle? a) ATP production b) oxygen production c) use of carbon dioxide to synthesize glucose. d) carbon dioxide production. e) removal of electrons from water for passage through an electron transport system. For a species with a haploid number of three chromosomes (n = 3), how many different combinations of chromosomes are possible in the gametes? A) 2 b) 3 c) 6 d) 8 e) 64

Explanation / Answer

59) Interphase accounts for about 90% of the total time involved in the cell division. It lasts for about 20 hours and includes G1, S and G2 phases.
Therefore, most of a cells time is spent in interphase stage of celldivision.

Hence, the correct option is (A).

60) Calvin cycle-The primary function of this cycle is to make organic products such as glucose which is needed for the plants through the process of carbon fixation. It uses products from the light reaction of phostosynthesis i.e ATP and NADPH and also carbondioxide , water to make sugar.

3 CO2 + 6 NADPH + 5 H2O + 9 ATP Glyceraldehyde-3-phosphate + 2 H+ + 6 NADP+ + 9 ADP + 8 Pi

Hence, the correct option is (C).

61) The formula for determining different combinations of gametes possible in the gametes is 2 power n(2n)
where n= number of different chromosomes n=3 implies 2n=6
Therefore, 3 chromosome pairs= 2 power of 3 possible unique combination for gametes=23=2*2*2= 8.

Hence, the correct option is (D).

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