G protein-coupled receptors are the largest family of cell surface receptors. Each receptor passes through the plasma membrane how many times?
A. Seven times
B. Three times
C. Once
D. Five times
Answer: A
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Which of the following is not true of the reaction catalyzed by RNA polymerases?
A. Template DNA is copied in the 3' to 5' direction. B. The 3'-hydroxyl group of the growing RNA strand is a nucleophile. C. The reaction is magnesium ion-dependent. D. U residues are incorporated into the RNA to pair with T residues of the template. E. The RNA molecule is synthesized in the 5' to 3' direction.
__________ increase the free surface area of epithelia that absorb substances. Fill in the blank(s) with the appropriate word(s)
In a population of 50,000 diploid individuals, what is the probability that a new neutral mutation will ultimately be lost from the population?
a. 0.99 b. 0.999 c. 0.9999 d. 0.99999 e. 0.999999
Which protist is a concern because of its ability to contaminate water supplies and cause diarrheal illness?
A) Plasmodium vivax B) Toxoplasma gondii C) Giardia lamblia D) Trichomonas vaginalis