The antibiotic penicillin targets the synthesis of peptidoglycan in bacterial cell walls. What specific step of peptidoglycan synthesis does it affect?
a) transport of peptidoglycan subunits across the plasma membrance
b) biosynthesis of N-acetylglucosamine and N-acetylmuramic acid
c) formation of cross-links between tetrapeptide side chains
d) glycolysis bonding of N-acetylmuramic acid to N-acetylglucosamine
e) hydrolysis of strach to release glucose monomers
Answer: c) formation of cross-links between tetrapeptide side chains
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The eradication of malaria in Europe resulted from a specific breakthrough in the science of
a. systematics. b. ecology. c. evolutionary studies. d. pest control. e. sanitation.
In an autosomal dominant disorder such as
Huntington disease, the probability of two parents with the gene passing this disorder on to a child is a. 0%. b. 25%. c. 50%. d. 75%. e. 100%.
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models a J-shaped growth curve. b. takes into account the carrying capacity of the environment. c. predicts continued exponential growth. d. characterizes the uncontrolled growth of a population. e. models a K-shaped growth curve.