Which molecule is responsible for separating double-stranded DNA into single strands?

A. DNA primase
B. DNA helicase
C. topoisomerase
D. DNA ligase
E. single-stranded binding proteins


B. DNA helicase

Biology & Microbiology

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Although most other clinically relevant gram-negative bacilli are intrinsically resistant to penicillin, it is the drug of choice for infections involving:

a. Sphingomonas paucimobilis. b. Pseudomonas aeruginosa. c. Pasteurella multocida. d. Weeksella virosa.

Biology & Microbiology

The drug used to treat sickle cell anemia that causes elevated levels of fetal hemoglobin is

____________. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

On a trip to the beach, you find a multicellular organism whose cells have chloroplasts and cell walls. Based on this description, you know that the organism could be a brown alga, a red alga, a green alga, or a land plant washed into the ocean. The presence of which of the following would allow you to definitively identify this organism as a plant?

A) Multicellular embryo B) Starch C) Cellulose D) Alternation of generations E) Chlorophyll a

Biology & Microbiology

A cell that uses an organic carbon source and obtains energy from light would be called a

A) photoheterotroph. B) lithoautotroph. C) photoautotroph. D) chemoheterotroph. E) chemoautotroph.

Biology & Microbiology