The actual sites of gas exchange in the mammalian lung are termed
A. alveoli.
B. lamellae.
C. parabronchi.
D. bronchi.
E. epiglotti.
A. alveoli.
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Pepsin, a digestive enzyme that degrades proteins in the stomach, is synthesized as pepsinogen and converted to active
pepsin in the stomach by the removal of several amino acids. The activation of pepsin is an example of ____.
a. transcriptional regulation b. translational regulation c. posttranscriptional regulation d. posttranslational regulation e. RNAi
Members of the phylum ____ are called acorn worms. They use their mucus-coated proboscis to
construct U-shaped burrows to trap food particles, and also trap food from water passed through gill slits in their pharynx.
a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata
Which is not a nucleotide base in DNA?
a. adenine d. thymine b. guanine e. cytosine c. uracil f. All are in DNA.
How would two unrelated individuals with the same color skin compare?
A) They would have similar alleles for melanin production. B) They would have similar alleles for repetitive DNA segments. C) They would have similar alleles for nose shape. D) They would be no more likely to have similar alleles for any gene than any two random individuals.