By Randy, Ph.D. Brooks
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15. Cell doubles in size and then stops growing in G1 phase. G1 is longest, most variable phase in which maximum growth occurs. Circumstances which induce a cell to divide arise in G1 under the influence of some cytoplasmic clock. Decision for cell division also occurs here. 16. Size of nucleus increases in interphase; size of nucleolus increases in first four substages of Prophase-I of meiosis. 17. Aristolochia (duck weed) has all types of tetrads. 18. Protein (histone) for DNA synthesis is formed in S-phase while tubulin protein required for spindle is synthesized in G2 .
C) absence of an X chromosome. (d) absence of a Y chromosome. 56. A particular allele can have different effects if it was inherited from a male rather than a female. This phenomenon is known as (a) extranuclear inheritance. (b) aneuploidy. (c) sex-linkage. (d) genome imprinting. 43 Practice Test Paper–Cell Biology 57. Human mitochondria (a) are inherited as an X-linked trait. (b) are all inherited from the father. (c) have linear DNA. (d) are all inherited from the mother. 58. Both chloroplasts and mitochondria (a) are found within the nucleus.
C) have linear DNA. (d) are all inherited from the mother. 58. Both chloroplasts and mitochondria (a) are found within the nucleus. (b) have linear DNA. (c) carry extranuclear genes. (d) are inherited from both parents. 59. Damaged DNA is excised by (a) restriction enzymes. (c) primase. (b) helicase. (d) DNA polymerase. 60. Unlike prokaryotic DNA replication, eukaryotic DNA replication (a) is completed by DNA polymerase. (b) cannot be completed by DNA polymerase. (c) is semiconservative. (d) has a multiple origin.
BarCharts QuickStudy Biology by Randy, Ph.D. Brooks