51. Which of the following reproduce by binary fission? A. bacteria B. archaea C
ID: 269419 • Letter: 5
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51. Which of the following reproduce by binary fission? A. bacteria B. archaea C. chloroplasts D. mitochondria E. All of these choices are correct. 52. The correct sequence of steps in the eukaryotic cell cycle is: A. GS phase G2 mitosis- cytokinesis. C. Go S phase > G, G2 cytokinesis mitosis. D. Go S phase > Gi S phaseG2 cytokinesis> mitosis. E. G, S phase G2cytokinesismitosis. 53. All of the following happen during mitosis except A. condensing of chromosomes. B. synthesis of DNA. C. formation of the spindle D. separation of sister chromatids at the centromeres. 54. How many copies of each gene are present in human skin cells at G2 of interphase C. 6 A. 2 B. 4 D. 8 55. Sister chromatids are best described as two DNA molecules that have: A. the same genes in the same order but having different alleles. B. the same alleles of the same genes in a different order. C. different genes in the same order and possibly having different alleles of some genes. D. virtually identical sequences of nucleotides. 56. In which phase of mitosis do spindle microtubules shorten? D. telophase A. prophase B. metaphase A. prophase A. haploid. B. diploid. C.polyploid. A.GrowthB. Cell replacement C. HealingD. All of the above A. Sister chromatid B. Non-sister chromatid C. anaphase 57. In which phase of mitosis does the nuclear envelope reform? 58. A human cell with a total of 23 chromosomes is: 59. Cell division occurs for 60. Chiasma (crossing over) takes place between B. metaphase C. anaphase D. telophase D. aneuploid C.Non-homologous chromosomesExplanation / Answer
51. Archaea, bacteria and some organelles like mitochondria and cytoplasm divided by the binary fission. Hence, E is correct.
52. Eukaryotic cells undergone three important phases in cell cycle which are interphase mitotic phase and cytokinesis. Hence, E is correct.
53. Separation of sister chromatids does not occur at the mitosis, it occur in meiosis. Hence, option “D” is correct.
54. 2 copies of gene is present at G2 phase, since replication has already occur before G2 phase. Hence, option “A” is correct.
55. Sister chromatids can be defined as virtually identical sequences of nucleotides. Hence, option “D” is correct.
56. At anaphase, spindle microtubule shorten. Hence, “C” is correct.
57. At telophase, nuclear envelope reform. Hence, option “D” is correct.
58. Human cell is called haploid as they have one set of chromosome. Hence, option “D” is correct.
59. Cell division occur for growth, replacement and healing. Hence, all options are correct. Hence, option “D” is correct.
60. Chaisma take place between non-sister chromatids. Hence, option “B” is correct.
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