Immune system cells differentiate between self and foreign cells by their ________.
A. markers
B. sizes
C. shapes
D. cell processes
E. cell walls
Answer: A
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Experiments have shown that increased nitrogen may affect the community composition of ____ fungi
a. mycorrhizal fungi alone b. club fungi alone c. saprobic fungi alone d. both mycorrhizal and club e. both mycorrhizal and saprobic
All humans belong to the same species.
a. true b. false
The female gametophyte generation in angiosperms is found in the:a
antheridium. b. prothallium. c. ovule of the ovary. d. stigma and style of the pistil. e. megasporophyte of the cones.
The cascade of events determining whether bacteriophage lambda elects to purpose lysogeny or a lytic cycle begins with a race between the production of the lambda repressor and ________.
A. endolysin B. integrase C. N protein D. Cro protein