The following phrases refer to the eukaryotic cell cycle. Select the single BEST choice for each phrase.
A. Last part of interphase in the parent cell
B. Period after DNA is duplicated
C. Period prior to mitosis
D. Nuclear division that maintains the chromosome number
E. Period commonly followed by cytokinesis
F. Period in which metaphase occurs
G. Period when DNA is duplicated
H. Period of cell growth before DNA duplication
I. Period when interphase begins in a cell
J. Event that divides a cytoplasmic mass
A. G2
B. G2
C. G2
D. Mitosis
E. Mitosis
F. Mitosis
G. S
H. G1
I. G1
J. Cytokinesis
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You isolate an organic molecule that contains C, H, O, N, and S. This molecule _____
A) is a disaccharide B) could be a glycoprotein C) is a nucleic acid D) could be cellulose or glycogen
Which of the following is a correct sequence of processes that takes place when a flowering plant reproduces?
A) meiosis ? fertilization ? pollination ? germination B) fertilization ? meiosis ? nuclear fusion ? formation of embryo and endosperm C) meiosis ? pollination ? nuclear fusion ? formation of embryo and endosperm D) growth of pollen tube ? pollination ? germination ? fertilization E) meiosis ? mitosis ? nuclear fusion ? pollination
The best explanation for the phenotypic differences between humans and chimps despite the great similarities in their gene-coding sequences is
A. the vast differences in exons between their genomes. B. the vast differences in the introns between their genomes. C. the "junk" DNA of humans contains important sequences not present in chimps. D. differences in gene expression between species.
How many sex chromosomes are in a human gamete?
A) one B) two C) three D) four