Watson and Crick incorporated which of the following into their model of DNA structure?
a. Franklin's diffraction data
b. Chargaff's rules
c. complementary base pairing
d. alternating sugar-phosphate backbone
e. All of these choices are correct
Ans: e. All of these choices are correct
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In North America, hawthorn trees were the ancestral hosts of the apple maggot fly ( Rhagoletis pomonella). In the last 150 years, however, cultivated apples have become a host for some populations of R. pomonella. What factor may have allowed the colonization of apples as a new host plant, and thus subsequent disruptive selection based on resource use?
A. Apples and hawthorns are commonly cultivated together in New England. B. Intense pesticide use in some hawthorn-producing regions forced the flies to seek new hosts. C. Apple trees and hawthorns are sister species and thus produce fruit with similar characteristics. D. The timing of reproduction in Mexican hawthorn feeding populations overlaps with apple fruiting in the Northeast. E. In the Southeast, a blight killed hawthorn populations, and small populations of flies were able to adapt to apple use.
An important characteristic of the double-stranded DNA molecule is that ___________.
A. DNA is composed of amino acids linked together by peptide bonds that form a double helix. B. DNA contains four nucleotides: cytosine, uracil, adenine, and guanine. C. Phosphodiester bonds are formed between bases in opposing DNA strands to form a double helix. D. Hydrogen bonding between base pairs is responsible for formation of a double helix.
Muscle cells are stimulated by acetylcholine released from the terminals of
A. sensory cell dendrites. B. sensory cell axons. C. transverse tubules. D. motor neuron dendrites. E. motor neuron axons.
Parthenogenesis is:
A. reproduction by way of diploid females laying diploid eggs that hatch into diploid females B. asexual reproduction by way of budding of a new individual from the parent C. reproduction by way of diploid females laying haploid eggs that require fertilization by sperm D. reproduction by way of haploid females laying haploid eggs that hatch into haploid females E. reproduction by way of diploid females laying haploid eggs that hatch into haploid males who in turn produce sperm that fertilizes other haploid eggs