In the respiration of terrestrial animals, “ventilation”
refers to
a. the bulk movement of air in and out of the
organism.
b. the diffusion of gases across a membrane.
c. the diffusion of gases in and out of blood cells.
d. the transport of gases to and from body cells.
e. all of these.
Answer: a
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Why is Hardy-Weinberg such a valuable tool when examining populations?
A. It enables us to predict phenotype frequencies. B. It enables us to identify if a population is evolving. C. It enables researchers to identify beneficial mutations. D. It enables researchers to determine if an allele is dominant or recessive.
The biological species concept cannot be used to distinguish between species that are extant
Indicate whether the statement is true or false.
Compared to other genes, the rbcL gene in plants has a mutation rate that is ____ most other plant
genes.
a. slower than b. similar to c. five times faster than d. more random than e. ten times faster than
Why are there fewer tRNA anticodons than the 61 needed to match each mRNA codon that codes for an amino acid?
A. There is some flexibility in pairing between the 5' base of the codon and the 3' base of the anticodon. B. There is some flexibility in pairing between the middle base of the codon and the middle base of the anticodon. C. There is some flexibility in pairing between all 3 bases of the codon and all 3 bases of the anticodon. D. There is some flexibility in pairing between the 3' base of the codon and the 5' base of the anticodon.