A substrate binding to an enzyme is most similar to a signal molecule binding to a
A. second messenger.
B. kinase.
C. transcriptional factor.
D. receptor.
E. G-protein.
Answer: D
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The two strands of DNA are bonded to one another by
A. covalent bonds. B. oxygen bonds. C. hydrogen bonds. D. carbon bonds.
The presence of which hormone in a female’s urine
indicates that she is pregnant? a. luteinizing hormone b. follicle-stimulating hormone c. chorionic gonadotropin d. progesterone e. estrogen
Which of the following countries has a predominantly alien flora and fauna?
A) New Zealand B) United States C) Russia D) Brazil E) Vietnam
In the context of a population, how is evolution defined?
a. Evolution is a change in a population's allele frequencies over generations. b. Evolution is the tendency for some individuals in a population to leave more offspring than others. c. Evolution is the way in which sexual reproduction can rapidly spread advantageous traits throughout a population. d. Evolution is the explanation for how organic molecules formed from inorganic molecules. e. Evolution is always caused by natural selection.