The number of circuits in the circulatory systems of humans is
a. one.
b. two.
c. three.
d. four.
b
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Organisms that require high levels of sodium chloride in order to grow are called ________ organisms.
Fill in the blank(s) with the appropriate word(s).
Noller’s conclusions from his experiments on ribosomes
a. were accepted immediately by the scientific community b. showed that the site of peptide bond formation is on rRNAs of the small ribosomal subunit c. indicated that site of peptide bond formation is on proteins of the small ribosomal subunit d. showed that the site of peptide bond formation is on rRNAs of the large ribosomal subunit e. indicated that site of peptide bond formation is on proteins of the large ribosomal subunit
Imprinting _____
a. is governed more by environment than genetics b. cannot be associated with learning c. can only occur during a short interval in the life of an animal d. must occurs over one’s entire lifetime e. is constantly being done and undone
The primary role of the two sperm in the pollen is to
A. produce the pollen tube. B. prevent embryo production. C. release proteins for germination. D. ensure fertilization of the egg and the central cell.