Which of the following is not a required characteristic of antigens from microbial pathogens that might be used in vaccine production?
A. It must be essential for the survival of the pathogen in the host.
B. It must be excreted or found on the surface of the pathogen.
C. It must be found in all strains of the pathogen.
D. All of the choices are correct.
Answer: D
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The most important chemical group that determines how tightly histones bind DNA is
A) acetyl. B) methyl. C) ethyl. D) phosphate.
Which hormone increases muscle mass?
a. progesterone b. estrogen c. luteinizing hormone d. testosterone e. more than one of these
Which statement about the beak size of finches on the island of Daphne Major during prolonged drought is true?
A) Each bird evolved a deeper, stronger beak as the drought persisted. B) Each bird's survival was strongly influenced by the depth and strength of its beak as the drought persisted. C) Each bird that survived the drought produced only offspring with deeper, stronger beaks than seen in the previous generation. D) The frequency of the strong-beak alleles increased in each bird as the drought persisted.
Identical twins
A. are the result of one fertilized egg dividing to become two individuals. B. do not usually have the same DNA. C. result from two eggs being fertilized by one sperm. D. result from one egg being fertilized by two sperms.