In DNA, the phosphate groups and the sugars are the outside of the double helix

a. true
b. false


Answer: a. true

Biology & Microbiology

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A pathogen is

(a) a disease. (b) an organism that causes a disease. (c) a substance that kills bacteria. (d) the same as a heterocyst.

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Nondisjunction can result in _____

a. polyploidy b. aneuploidy c. crossing over d. pleiotropy

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The term "plankton" ____

a. refers to a taxonomic division of algae b. is a common term for microscopic organisms that drift or swim weakly in water c. includes only multicellular forms d. refers to small aquatic plants e. would apply to large brown algae

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Mitosis takes place during M phase, which is the longest phase of the cell cycle.

a. true b. false

Biology & Microbiology