Many drugs that inhibit the synthesis of the cell wall act by
A. preventing the cross-linkage of NAM subunits.
B. blocking the secretion of cell wall molecules from the cytoplasm.
C. preventing the formation of alanine-alanine bridges.
D. disrupting the formation of the mycolic acid layer of the cell wall.
E. preventing the formation of ?-lactamases.
Answer: A
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A cell with 36 chromosomes undergoes meiosis. The end result is ____________________
a. two cells with 36 chromosomes b. four cells with 36 chromosomes c. two cells with 18 chromosomes d. four cells with 18 chromosomes
Flooding, landslides, soil nutrient loss, and global climate change all result from:
a. the introduction of exotic plants b. desertification c. deforestation d. ozone depletion e. biological magnification
What specific amino acid difference did you discover between normal and sickle-cell betaglobin?
a. Glutamine is replaced by valine. b. Valine is replaced by glutamic acid. c. Glutamic acid is replaced by valine. d. No differences were detected.
The process by which elevated nutrient levels lead to an overgrowth of algae and the subsequent depletion of water oxygen levels is known as
A. assimilation B. decomposition. C. succession. D. biogeochemical cycling. E. eutrophication.