Evolution can be best defined as ________
A) the production of new species
B) not involving humans
C) change in gene frequency in a population
D) always taking a very long time to occur
C
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Restriction enzymes
a. work at specific base sequences b. function only at “sticky ends.” c. produce uniform lengths of DNA. d. function in viruses. e. are produced by viruses to break down bacterial DNA.
Lactose intolerance is caused by a(n) ____
a. nucleotide substitution that prevents lactose production b. variant manifestation of galactosemia c. accumulation of galactose-1-phosphate d. inability to digest lactose e. excess in lactose production
All of the following statements concerning nitrogen fixation are true EXCEPT which one?
A. The amount of carbon that is taken up by plants and microbes can be dictated by how much nitrogen is available to support growth. B. Nitrogen fixing microbes convert N2 to ammonia. C. The products of nitrogen fixation are incorporated into amino acids and nucleic acids. D. Nitrogen fixation does not affect the rate of carbon flux.
Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?
A) auxin and phytochrome B) auxin and Pfr C) Pfr and phytochrome D) cytokinins and phototropins