The gene of an operon that codes for a protein repressor is called the
A. structural locus.
B. operator.
C. regulator.
D. promoter.
Answer: C
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In the 1700s, a system was developed for naming plants and animals and grouping similar organisms together. What is such a system called?
a taxonomic system a life categories system a descriptive grouping system a phylogeny system
Why does a DNA strand grow only in the 5? to 3? direction?
A) because DNA polymerases can only add nucleotides to the 3? end of the growing molecule B) because DNA polymerases can only add nucleotides to the 5? end of the growing molecule C) because the DNA molecule only unwinds in the 5? to 3? direction D) because DNA polymerase requires the addition of a starter nucleotide at the 5? end
Low body temperature triggers adaptive responses to conserve heat. Once the integrating center detects that body temperature has risen, it will decrease these responses. What is this an example of?
A. Adaptation B. Positive feedback C. Negative feedback D. Acclimatization
Which organism is more likely to suffer due to biological magnification?
A. minnow B. pelican C. earthworm D. caterpillar E. algae