Which of the following is an abiotic factor?
a. symbiotic relationships
b. prey populations
c. annual precipitation
d. parasites
c. annual precipitation
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Why do organisms with different appearances develop along similar pathways?
a. These organisms live in similar environments. b. Reproduction occurs in similar ways for these organisms. c. Similar genes control the development of these organisms. d. Asexual reproduction produces similar appearances.
Mutations in human DNA rarely impair normal cell function because
A) repair of DNA prevents all mutations from ever causing damage to a cell. B) damaged cells commit "suicide" to prevent damage to the body. C) cells have one major repair enzyme that corrects the mutations quickly. D) multiple DNA repair enzymes usually quickly correct the mutations before any damage can occur. E) the cells attack dysfunctional gene products, averting damage to the cell.
What evolutionary advantage is provided by sexual reproduction?
a. increased genetic diversity b. making clones c. production of genetically identical offspring d. making polyploidy possible e. removal of all genetic mutations
Why is it so important that all of the chromosomes align on the metaphase plate during metaphase?
A. This is the location where the chromosomes can become attached to the spindle microtubules. B. This is the only place in the cell where the cyclins and Cdks are located. C. This allows asters to form. D. This allows sister chromatids to form. E. If they cannot, it suggests that they aren't properly attached to the spindle microtubules, and thus won't separate properly during anaphase.