All viruses must separate the nucleic acid from the capsid before replication
Indicate whether this statement is true or false.
TRUE
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Cells actively secreting enzymes would likely carry out more ____ than other cells
a. exocytosis b. osmosis c. endocytosis d. conjugation e. fractionation
Marine plants may contribute to the prevention of algal blooms by:
a. trapping sediments. b. absorbing excess nutrients. c. removing toxic organic pollutants. d. producing detritus. e. blocking sunlight.
Unsaturated fatty acids cause a membrane to be fluid at lower temperatures. What is a reasonable explanation for this?
a. Unsaturated fatty acids permit more water into the interior of the membrane. b. The double bonds form a kink in the fatty acid tail, forcing adjacent lipids to be spaced farther apart. c. The double bonds in the unsaturated fatty acids block interaction among the hydrophilic head groups of the lipids. d. Unsaturated fatty acids have a higher cholesterol content.
The molecule that is polar and acts like a base is
A. R-OH B. R-PO4 C. R-NH2 D. R-CO-R E. R-SH