Crossing-over between homologous chromosomes occurs at which of the following stages of meiosis?
A) S phase
B) prophase I
C) metaphase I
D) anaphase I
E) prophase II
B) prophase I
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How is active immunity different from passive immunity?
a. Active immunity is slower in onset and shorter-lived. b. Active immunity is slower in onset and longer-lived. c. Active immunity is faster in onset and shorter-lived. d. Active immunity is faster in onset and longer-lived. e. Only active immunity involves antibodies.
The cell wall
a. provides physical support for plant cells. b. controls the transport of materials out of the cell. c. replaces the plasma membrane in plant cells. d. is found in all eukaryotes. e. prevents the transport of toxic substances into the plant cells
Four of the five choices listed below can be used to
describe fungal life. Select the exception. a. heterotrophic b. saprobic c. parasitic d. decomposer e. autotrophic
There are fewer antifungal, antiprotozoan, and antihelminthic drugs compared to antibacterial drugs because fungi, protozoa, and helminths
A. are not affected by antimicrobials. B. have fewer target sites in their cells compared to bacteria. C. are so similar to human cells that drug selective toxicity is difficult to achieve. D. do not cause many human infections. E. are parasites found inside human cells.