The minimum amount of energy needed to get a chemical reaction started is called the ____ energy
a. activation
b. reaction
c. enzymatic
d. chemical
e. triggering
ANSWER: a
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In the technique of embryo splitting, _____
a. two embryos are fused b. an embryo is split apart to form two identical individuals c. two sperm are used to fertilize a single egg d. two eggs and two sperm are used to form two embryos e. an embryo’s nucleus is removed and replaced with an adult embryo
The monomer subunit of immunoglobulin molecules has all of the following except
A. a variable and constant region on each polypeptide chain. B. disulfide bonds between polypeptide chains. C. four antigen binding sites. D. two identical heavy polypeptide chains. E. two identical light polypeptide chains.
The large, ancient land mass that contained all the
continents is called a. Laurasia. b. Pangea. c. Gondwana. d. Atlantis. e. Europa.
Which of the following terms best characterizes catabolite repression associated with the lac operon in E. coli?
A) constitutive B) inducible system C) positive control D) negative control E) repressible system