Which of the following statements is correct about the cell cycle?
A. The cell cycle is a sequence of replication and division that produces a new cells.
B. The phase of the cell cycle are G1, S, and M phases.
C. In actively dividing cells, the S and G2 phases are collectively known as interphase.
D. When the S phase of the cell cycle is finished, a cell actually has twice as many chromatids as the number of chromosomes in the G1 phase.
E. During G2 phase, the cell grows and copies its chromosomes in preparation for cell division.
D. When the S phase of the cell cycle is finished, a cell actually has twice as many chromatids as the number of chromosomes in the G1 phase.
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As succession proceeds, what occurs with animals living in the habitat?
A) Animals adapt to the new vegetation. B) Animals leave as their habitat disappears. C) New animal species evolve in response to vegetation. D) Animal species diversity continually decreases.
A newly evolved species may take over an ecological role or ecological niche that is already occupied, provided that
the new species has:a. the ability to alter or change the environmental parameters. b. fitness that is almost as high as the fitness of the original species. c. the ability to grow to a larger size, thus providing it with a selective advantage. d. features that make it competitively superior to the original occupant of that niche. e. the ability to evolve through natural selection, as opposed to the original occupant, who cannot continue to evolve.
The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its
A. immunity. B. amino acid sequence. C. net charge. D. solubility. E. conformation.
Red blood cells are produced in the _______.
a) thymus gland b) liver c) pancreas d) red bone marrow e) kidneys