Organisms are more likely to be preserved under which condition?
a. surface burial
b. anaerobic environment
c. slow burial
d. decay in water
e. wind and water erosion
ANSWER: b
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The trp operon is an example of a(n) ____ operon where tryptophan acts as a(n) ____
a. inducible; inducer b. inducible; activator c. repressible; corepressor d. repressible; repressor e. repressible; inducer
Craniates are chordates that all possess
A) a head. B) jaws. C) a vertebral column. D) amniotic eggs.
During crossing over, _____.
A) corresponding portions of genetic material are switched between homologous chromosomes B) beneficial combinations of genes are passed intact from parent to gamete C) the better, dominant genes are recombined prior to gamete formation D) all of the choices characterize crossing over
Cells save energy and materials by using many of the same enzymes for both ________ and ________ .
A. peptidoglycan; lipopolysaccharides B. metabolism; catabolism C. ATP; NADPH D. anabolism; catabolism