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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Cnidarians and ctenophores are similar in that they both have
a. radial symmetry. b. mesoderm. c. a digestive tract with two openings. d. a pseudocoel. e. nematocysts.
Biology & Microbiology
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
Biology & Microbiology
DNA is made up of many
ucleotides. RNA molecules. proteins. amino acids
Biology & Microbiology
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.
Biology & Microbiology