Why do certain cells of the lungs produce mucus? Select all correct choices
A. to decrease the surface tension (of liquids)
in the lung
B. to trap pathogens and guard against
infection
C. to cause oxygen to go into solution and
diffuse into the bloodstream
D. to prevent the diffusion of blood into the
alveoli
B,C
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Some flowering plants cannot self-pollinate which increases their tendency to mate with phenotypically different mates, a process called disassortative mating. What effect would this have on a population in Hardy-Weinberg equilibrium?
A. The population would remain in Hardy-Weinberg equilibrium. B. A decrease in heterozygotes would be observed. C. An increase in heterozygotes would be observed. D. No change homozygotes or heterozygotes would be observed. E. An increase in homozygotes would be observed.
A frameshift mutation results in
a. a normal protein due to the redundancy of the genetic code. b. errors in DNA replication c. errors in DNA splicing d. a change in all mRNA codons downstream from the mutation e. a change in the third position of one codon
Epigenetic changes to host cells by infecting microbes can result from binding of microbial product to which two of the following?
a. ribosomal RNA b. lipopolysaccharide c. small RNAs d. histones
What muscle works in a pair with the biceps brachii?
A. the masseter B. the trapezius C. the triceps brachii D. the sartorius E. the pectoralis major