Which panel of the figure represents the DNA with
genes of interest?
a. A
b. B
c. C
d. D
e. both A andb
Answer: a
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In a certain breed of chicken, an incompletely dominant gene controls color. The homozygous black,
when crossed with the homozygous splashed-white, produces an intermediate gray color pattern called blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, while the recessive allele (r) produces single. Give the F1 and F2 genotypic and phenotypic ratios of a cross between a pure-breeding, black single and a pure-breeding, splashed-white rose. What will be an ideal response?
Restriction enzymes
a. often produce staggered cuts in DNA that are useful in splicing genes. b. are like most enzymes in that they are very specific in their action. c. are natural defense mechanisms evolved in bacteria to cut apart short sequences of DNA. d. are used along with ligase and plasmids to achieve genetic recombination. e. all of these
What is the major differences between the cell walls of gram-positive and gram-negative bacteria?
A. the peptidoglycan layer in gram-positive bacteria is substantially thicker B. the cell wall of gram-postive bacteria contains mycolic acids C. gram-positive bacteria contain a cytoplasmic membrane D. gram-positive bacteria may have a polysaccharide capsule as a covering
Which of the following human diseases may result from exposure to soil containing the microbe responsible?
A) blastomycosis B) giardiasis C) crown gall disease D) cryptosporidiosis E) saxitoxin poisoning