Which nucleic acid acts like an enzyme, stabilizing and orienting different molecules to facilitate the formation of bonds between them?
A) DNA
B) rRNA
C) tRNA
D) mRNA
B
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In angiosperms, double fertilization produces a trinucleate cell that gives rise to a ____ endosperm and a ____
embryo.
a. haploid; triploid b. triploid; haploid c. triploid; diploid d. diploid; triploid e. diploid; haploid
Which variable will influence radioactive decay?
a. Moisture b. Temperature c. Time d. Pressure e. Chemical bonding state
Keratin is an important aspect of nonspecific defense because it
A. is toxic to pathogens. B. creates a physical barrier against pathogens. C. physically restricts pathogens to a specific region. D. destroys pathogens.
One of the major threats to more than 90 percent of endangered species is ____
a. habitat loss b. air pollution c. water pollution d. radioactivity e. ozone depletion