The electron micrograph in the figure shows chromatin organized like beads on a string. Which histone protein is usually associated with the "string" portion?
a. histone H1
b. histone H2A
c. histone H3
d. histone H4
Answer: a. histone H1
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You are studying a population of geese in which there are two color phases, brown and gray. Color in this species is controlled by a single gene, with brown dominant to gray. A random sample of 250 geese shows that 210 are brown. What percentage of the brown geese are heterozygous? (Assume that the population is in Hardy-Weinberg equilibrium.)
A. 36% B. 43% C. 48% D. 57% E. 84% Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the Hardy-Weinberg principle? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The extinction of the _____ during the end-Cretaceous mass extinction allowed mammals to diversify through the process of _____
A. ammonites; peripatric speciation B. dinosaurs; peripatric speciation C. dinosaurs; adaptive radiation D. ammonites; adaptive radiation E. cephalopods; adaptive radiation
Protists are NOT monophyletic. This means that protists:
A. are all members of the same phylum B. are all more closely related to each other than they are to any other kind of organisms C. are not all more closely related to each other than they are to some other organisms D. are all more closely related to bacteria than they are to other organisms E. are all more closely related to fungi than they are to any other organisms
Restriction enzymes
a. produce staggered cuts in DNA that are often useful in splicing genes. b. are very specific in their action. c. are natural defense mechanisms in bacteria that destroy foreign DNA introduced by viruses. d. are used along with ligases and plasmids to produce DNA libraries. e. are all of these.