The chemical difference between dideoxyribonucleotides used in Sanger sequencing and the deoxyribonucleotides
normally found in DNA is the presence of a(n) _____ in the deoxyribose sugar of dideoxyribonucleotides.
a. 3' – H rather than – OH
b. 5' – H rather than – OH
c. 5' – OH rather than – H
d. 5' – H rather than – OH
e. 3' – COOH rather than – OH
ANSWER: a
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Assuming the gardener continues to spray the herbicide for five years, do you think the weed
population will evolve?
a. Yes, there will be more individuals in the population with the herbicide-resistant allele. b. No, there will be no change in the genetic composition of the population. c. Yes, the population will have evolved because speciation will have occurred. d. No, evolution cannot occur over such a short time period.
A study of certain nuclear genes in humans and chimpanzees shows that the two species differ in 5 percent of their DNA bases. Base substitution mutations occur at a rate of 1 percent per one million years. How many million years ago did these species diverge?
A) 0.5 B) 1 C) 3 D) 5
A spontaneous reaction releases energy. This type of reaction is ________
Fill in the blank with correct word.
The form of nitrogen most likely to be absorbed from the soil by plants is
A. nucleic acids. B. nitrogenous wastes. C. nitrous oxide gas. D. nitrogen gas. E. nitrite/nitrate ions.