The human urinary system consists of all of the
following structures EXCEPT
a. urinary bladder.
b. urethra.
c. two adrenal glands.
d. two ureters.
e. two kidneys.
C
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Which tree of the North American eastern
forests has had its population decimated by a fungal disease?
a. chestnut b. maple c. oak d. eastern pine e. dogwood
The veins of leaves are used for
a. support. b. identification. c. transport of water and nutrients. d. detachment in the autumn. e. all of these.
Twenty loci are screened for genetic variation in a common caterpillar species. Four loci are found to have two or more alleles. The proportion of polymorphic loci for this population is thus
A) 0.10. B) 0.20. C) 0.30. D) 0.40. E) 0.50.
In DNA replication, RNA primer is necessary because
A. DNA synthesis starts and stops many times before completed. B. DNA synthesis begins at multiple origins of replication. C. the two strands of a replicating helix must make a full rotation to unwind. D. DNA polymerase is unable to initiate a new polynucleotide chain.