How might a change of one amino acid at a site, distant from the active site of an enzyme, alter an enzyme's substrate specificity?
A) by changing the enzyme's stability
B) by changing the enzyme's location in the cell
C) by changing the shape of an enzyme
D) by changing the enzyme's pH optimum
E) An amino acid change away from the active site cannot alter the enzyme's substrate specificity.
Answer: C
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The polymerase chain reaction is used to
A. amplify certain sections of DNA. B. amplify mRNA. C. produce proteins. D. produce long polymers of carbohydrates to be used in electrophoresis.
A parasite may be described as an organism that derives nourishment from another living organism and
a. becomes necessary to the life of the host b. is neutral in its effect on the host c. benefits the host nutritionally d. provides a supportive structure for the host e. harms the host in the process
Which animals are ectothermic?
A) frogs and mammals B) lizards and birds C) turtles and lizards D) birds and mammals
Which of the following is the subdiscipline of biology concerned with the study of heredity and variation at the molecular, cellular, developmental, organismal, and populational levels?
A) cytogenetics B) molecular biology C) biochemistry D) cell biology E) genetics