What are genes that have the potential to mutate and cause cancer?
a. transgenes
b. oncogenes
c. proto-oncogenes
d. tumor suppressor genes
c. proto-oncogenes
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How does peer review influence the development of scientific theories?
A. Peer review allows other scientists to know what is current in their field. B. Careful evaluation of research results by other scientists ensures that only solid and legitimate research results are published, and helps prevent faulty research or false claims from being viewed as scientific fact. C. Peer review increases competition among scientists and thus increases the quality of the published work. D. Peer review makes it extremely difficult for work to be published other than earth-shattering scientific theories.
What is the difference between sister chromatids before and after anaphase II?
a. Before anaphase II, the sister chromatids are separate; after anaphase II, the sister chromatids join and form a chromosome. b. Before anaphase II, the sister chromatids form a single chromosome; after anaphase II, each sister chromatid is an individual chromosome. c. Before anaphase II, each sister chromatid is an individual chromosome; after anaphase II, the sister chromatids form a single chromosome. d. Before anaphase II, the sister chromatids form a single chromosome; after anaphase II, the sister chromatids become homologous chromosomes. e. There is no difference; they are still together as a single chromosome.
Which statement about the cytoskeleton is correct?
a. Microfilaments are narrower than both intermediate filaments and microtubules. b. Microfilaments resist compressive forces on the cell and help it to retain its shape. c. Intermediate filaments provide pathways for organelles to follow during cell division. d. Microtubules are involved in movement external to the cell but not internally.
Which cells may spend the most time in interphase?
a. epithelial cells lining the stomach b. hair follicles c. motor neurons in the spine d. skin cells on the hands