The ends of DNA molecules cut by restriction enzymes are "sticky" because
A. the enzymes coat them with protective, complex polysaccharides.
B. unless a second enzyme is added, the fragments stick to the restriction enzymes.
C. they are single-stranded.
D. the enzymes cut each strand of the DNA at different places.
E. they are single-stranded and the enzymes cut each strand of the DNA at different places.
E
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The autonomic subdivision consists specifically of
a. central and peripheral nerves. b. parasympathetic and sympathetic nerves. c. somatic and involuntary nerves. d. brain and spinal cord nerves. e. spinal and cranial nerves.
An individual heterozygous for cystic fibrosis ________
A) cannot have children with cystic fibrosis B) is a carrier C) will have children who are all carriers of cystic fibrosis D) has cystic fibrosis
Which term refers to the voltage across a membrane?
a. membrane electrochemical gradient b. membrane potential c. membrane chemical gradient d. membrane turgor pressure
Media containing some ingredients of unknown chemical composition are called ________ media.
A. defined B. complex C. synthetic D. undefined