There are fewer antifungal, antiprotozoan, and antihelminth drugs compared to antibacterial drugs because these organisms
A) Are not affected by antimicrobics.
B) Do not cause many human infections.
C) Have fewer target sites compared to bacteria.
D) Are so similar to human cells that selective drug toxicity is difficult to achieve.
E) Are parasites found inside human cells.
D) Are so similar to human cells that selective drug toxicity is difficult to achieve.
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Mitochondrial DNA is useful for tracing ancestry because:
A. recombination rarely occurs. B. mutations in mitochondrial DNA are rare; mitochondrial DNA has relatively little variation. C. mutations in mitochondrial DNA are almost always harmful. D. both recombination and mutation in mitochondrial DNA are rare. E. both recombination and mutation in mitochondrial DNA are rare, but when mutations do occur, they are almost always harmful.
Which portion of mRNA protects the strand and serves as a ribosome attachment site?
a. promoter b. nucleotide cap c. codon d. transcript e. polymerase
Which of the following might lead to the generation of several incorrect PCR products?
A) An annealing temperature that is too low B) An annealing temperature that is too high C) Performing 30 cycles of PCR D) Using the correct primers E) Including an extension step
Marc Spehr and his colleagues demonstrated that ____
a. sperm cannot detect and swim toward attractant molecules b. sperm can detect and swim toward attractant molecules c. eggs release chemicals that attract sperm d. sperm attraction can be inhibited by chemicals e. sperm can release chemicals that kill other sperm