The chlorophyll molecule has a porphyrin ring that contains a single atom of:

a. manganese.
b. magnesium.
c. phosphorus.
d. nitrogen.
e. iron.


B

Biology & Microbiology

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Indicate whether this statement is true or false.

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An air temperature rise of 10?C will typically ____ evaporation from leaves

a. completely eliminate b. double the rate of c. mostly eliminate d. triple the rate of e. quadruple the rate of

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An advantage of using reverse transcriptase to prepare a gene for cloning is that

A) reverse transcriptase is more efficient than RNA polymerase. B) the resulting DNA strand will lack exons. C) reverse transcriptase is more efficient than DNA polymerase. D) the resulting DNA strand will lack introns.

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Oxygen kills some bacteria because of the production of _______

a. carbon dioxide b. oxygen free radicals c. a sodium cation d. water

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