When an amino acid is converted to a keto acid, it
A. gains nitrogen.
B. becomes a fatty acid.
C. loses nitrogen.
D. becomes a pyruvic acid.
C. loses nitrogen.
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The human body's largest bone is the:
a. femur b. humerus c. radius d. tibia e. ulna
Speciation has become complete when
A) two populations of organisms have been separated for a very long time. B) a change in allele frequency has occurred. C) organisms of one population do not recognize the mating call of another population and so mating does not occur. D) offspring of mating from members of two different populations are able to mate with members of either population.
An atom will react with other atoms only until:
A) it forms four covalent bonds B) all of its inner orbitals have been filled. C) it has completely filled its outermost energy level. D) it has less stability.
Which of the following types of animal virus requires RNA-dependent RNA transcriptase to be replicated?
A. +ssRNA viruses B. ssDNA viruses C. -ssRNA viruses D. retroviruses E. dsDNA viruses