In sickle cell anemia, affected individuals carry ____
a. one of several different nucleotide substitutions
b. the same single nucleotide substitution
c. more than one nucleotide substitution
d. a number of mutant alleles
e. one mutant allele in several genes
b
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How many cell types would we expect to find in the simple primary tissues of plants?
A. One or two simple cell types. B. Several cell types. C. Many cell types. D. This cannot be generalized.
Enzymes function primarily by
a. forcing the reactants into an altered environment which in turn creates a change in the free energy of the reactants relative to the products. b. altering the equilibrium point of a particular reaction to favor the formation of products. c. increasing the probability that the reactants will come into close proximity to each other in the proper orientation for forming the transition state molecule. d. removing reactants from solution in a set ratio that enhances the chances of the remaining individual reactants interacting with each other. e. changing the ratio of reactants to products so that the forward reaction is favored.
Kidney __________ are small, tubular structures that interact with nearby capillaries to form urine. Fill in the blank(s) with the appropriate word(s)
What type of muscle fibers will be found in large percentages in the leg muscles of a person who excels at weight lifting but does not do well at running marathons?
A) slow-twitch B) fast-twitch C) intermediate D) high-density