Penicillins and cephalosporins
A. damage cell membranes.
B. block peptidases that cross-link glycan molecules.
C. attach to the 30S ribosomal subunit and disrupt protein synthesis.
D. are metabolic analogs of PABA and block folic acid synthesis.
E. destroy peptidoglycan.
Answer: B
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a. H2O only b. CO2 only c. O2 only d. both CO2 and O2 e. both CO2 and H2O
A gene that produces multiple effects is called a(n)
a. multiple allele. b. autosome. c. epistatic gene. d. pleiotropic gene. e. incompletely dominant gene.
A circular DNA molecule with two restriction enzyme cut sites will yield three fragments on digestion
Indicate whether the statement is true or false