Which of the following traits is unique to arthropods?
a. Appendages
b. Segmentation
c. A ventral nerve cord
d. A dorsal anterior brain
e. An exoskeleton
Ans: e. An exoskeleton
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A good sampling method for quantifying the density of birds or bats is the use of
A. line transects. B. quadrats. C. pitfall traps. D. baited live traps. E. mist nets.
Probably the most abundant carbohydrate on Earth, this unbranched chain of ?-glucose subunits is the
primary structural fiber in plant cell walls.
a. chitin b. amylopectin c. cellulose d. glycogen e. amylose
The antiparallel polarity of the two DNA strands within the double helix affects DNA replication in that
A) it takes twice as long to replicate two strands sequentially from 5? to 3?. B) circular bacterial DNA does not have polarity, so a single strand can be copied twice. C) DNA polymerases synthesizing both strands move in the direction of the replication fork, one strand is replicated discontinuously. D) each portion of the double helix must be unwound twice so that both strands are replicated continuously.
Epigenetics is most closely associated with
which of the following?
a. base-pair substitution b. metylation c. Barr bodies d. hydrolysis e. phosphorylation