Messenger RNA editing is an example of gene expression at the _________ level.
a) preternatural
b) post-translational
c) post-transcriptional
d) translational
e) transcriptional
Ans: e) transcriptional
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All of the following describe characteristics of sclerenchyma cells, except which?
A. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf. B. They have thick, tough secondary walls. C. Their secondary walls may be impregnated with lignin. D. They form fibers and sclereids. E. They lack living protoplasts when mature.
Which of the following is an abiotic factor?
a. symbiotic relationships b. prey populations c. annual precipitation d. parasites
The protein coat of a virus is also referred to as its:
a. cell wall. b. capsomer. c. armor. d. capsid. e. antigen.
Which of the major macromolecules—lipids, carbohydrates, proteins, and nucleic acids—contain nitrogen atoms (N)?
A. Lipids and nucleic acids B. Carbohydrates and proteins C. Carbohydrates and lipids D. Nucleic acids and proteins