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.

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology