Although symbiotic relationships between nitrogen-fixing bacteria and plants are rare, many plants have symbiotic relationships with

A. filamentous algae.
B. mycorrhizal fungi in the soil.
C. nematode worms in the soil.
D. other plants.
E. soil insects.


Answer: B

Biology & Microbiology

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A. on the thylakoid membranes. B. in the cytoplasm. C. in the chloroplast. D. on the plasma membrane.

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Which of the following may account for the process of gene conversion?

A. DNA mismatch repair B. DNA gap repair C. Photolyase activity D. Nucleotide excision repair

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On the illustration, "A" and "B" should be

labeled respectively a. consumers; producers b. decomposers; producers c. producers; redistributors d. producers; consumers e. consumers; decomposers

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Osteoporosis is a condition of excessive bone loss caused by an imbalance between osteoblast and osteoclast activity, and occurs primarily in women.

a. true b. false

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