Eukaryotic sexual life cycles show tremendous variation. Of the following elements, which do all sexual life cycles have in common?
I. Alternation of generations
II. Meiosis
III. Fertilization
IV. Gametes
V. Spores
A) I, II, and IV
B) II, III, and IV
C) II, IV, and V
D) I, II, III, IV, and V
B
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Which of the following describes the process of eutrophication?
a. Nutrient runoff causes the overgrowth of algae. b. Minerals and nutrients cycle through the biotic world. c. Excess phosphorus decomposes plant roots. d. Rainwater falls to the ground through sulfur dioxide gas.
Epithelial cells are more likely to become
cancerous than other tissue cells because epithelial cells
a. lack a nucleus. b. are always exposed to the external environment. c. are only found in simple tissues. d. do DNA replication more often. e. have an extensive blood vascular system
A DNA mutation that gives a distinguishable phenotype for a chromosome or gene is a
A) recessive allele. B) lethal mutation. C) parental type. D) linkage group. E) genetic marker.
Bile is made in the ________ and stored in the ________.
A. cecum; appendix B. pancreas; gallbladder C. rectum; pancreas D. stomach; liver E. liver; gallbladder