Organisms capable of nitrogen fixation
a. include some bacteria.
b. include some cyanobacteria.
c. may live as symbionts with other organisms.
d. all of the above.
b
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Which of the following are involved with tumor suppression?
a. oncogenes b. tumor suppressor genes c. DNA repair genes d. both tumor suppressor genes and DNA repair genes
Chemicals in tobacco smoke can cause _____
a. DNA to break into pieces. b. mispairing of bases. c. kinking in the DNA molecule. d. the formation of nucleotide dimers. e. covalent bonding between adjacent adenine bases.
Which of the following represents the possible genotype(s) resulting from a cross between two individuals that are
heterozygous (Bb)? a. BB and Bb b. BB, Bb, and bb c. BB only d. Bb only e. bb only
When substances move across a plasma membrane and down concentration gradients, this is called
A) pinocytosis. B) active transport. C) passive transport. D) exocytosis.