Which of the following is not a greenhouse gas?

A. Nitrogen
B. Water vapor.
C. Carbon dioxide.
D. Methane


Ans: A. Nitrogen

Biology & Microbiology

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Only ______ have a lung designed so that air can flow through them in one direction

a. a few fish b. amphibians c. birds d. mammals e. insects

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The sigma subunit of bacterial RNA polymerase ___________________

(a) contains the catalytic activity of the polymerase. (b) remains part of the polymerase throughout transcription. (c) recognizes promoter sites in the DNA. (d) recognizes transcription termination sites in the DNA.

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