________ used models to deduce the double helical shape of DNA.
A) Linus Pauling
B) James Watson and Francis Crick
C) Martha Chase
D) Maclyn McCarty
B) James Watson and Francis Crick
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Which chromosomal change rarely has an effect on the phenotype of the individual who carries it?
A. Robertsonian translocation B. Unbalanced translocation C. Balanced translocation D. Chromosome loss
Which feature of a plasmid cloning vector is necessary for the plasmid to be replicated inside a host cell?
a. lacZ+ gene b. ampicillin resistance gene c. origin of replication d. ribosomal binding site e. restriction site
Trees that lose only a few leaves at a time are
A. deciduous trees. B. carnivorous trees. C. maple trees. D. hickory trees. E. coniferous trees.
Muscle cramps and paresthesias in a malnourished patient with alcoholism are MOST likely the result of:
A) hypocalcemia. B) hypernatremia. C) hyperkalemia. D) hypermagnesemia.