Once used by an organism, carbon- and nitrogen-based nutrients are unavailable for other organisms
Indicate whether the statement is true or false
FALSE
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Animal cells commonly have polysaccharides attached to ____ in their surface membranes
a. proteins b. nucleic acids c. lipids d. both nucleic acids and lipids e. both proteins and lipids
If mRNAs could be ligated and replicated within plasmids, what enzyme commonly used in recombinant DNA technology would no longer be needed?
A) restriction enzymes B) DNA polymerase C) RNA polymerase D) reverse transcriptase E) Taq polymerase
This hormone does not play a role in the female reproductive system.
A. estradiol B. progesterone C. gonadotropin-releasing hormone D. follicle-stimulating and luteinizing hormones E. insulin
When populations become geographically separated for a period and then come back into contact, they __________ become different species.
a) always b) sometimes c) never