What part of the DNA replication process would be most directly affected if a strain of bacteria lacking helicase were used to make the cell extracts?
(a) initiation of DNA synthesis
(b) Okazaki fragment synthesis
(c) leading-strand elongation
(d) lagging-strand completion
(a) Because helicase unwinds the two DNA template strands, replication of both strands depends upon the activity of helicase at the time of initiation.
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Select the reasons why adaptive radiations are often observed on remote volcanic islands. Check all that apply.
_____ When a new volcanic island forms, there are many empty niches. _____ Only a few individuals reach remote islands. _____ Remote islands have more plant diversity than the mainland does. _____ Evolution is intrinsically faster on islands than on the mainland.
Which of the following describes fission?
a. An organism splits into two separate organisms. b. Fertilized eggs develop outside the female’s body. c. A new organism forms and breaks away from the adult. d. An egg develops into an individual without being fertilized.
In the stomach, food processing continues and secretions from stomach glands aid the initial digestion of
A. carbohydrates. B. nucleic acids. C. vitamins. D. proteins. E. lipids.
In Drosophila, a developmental mutation called ssa (spineless aristapedia) results in flies with mini leg parts on the antennae. What kind of gene is this mutation?
A) gap gene B) pair-rule gene C) homeotic gene D) segment polarity gene E) maternal effect gene