If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain?

a. 50
b. 200
c. 75
d. 25
e. 150


Answer: c. 75

Biology & Microbiology

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V. cholerae and Photobacterium damsela are used to perform quality control on TCBS agar. After overnight incubation, no growth is observed. What is the next course of action?

a. Reinoculate the TCBS agar, and incubate for 36 hours. b. Check the pH to ensure that it is 8.6. c. Reincubate the plates for another 24 hours. d. These two organisms are poor choices for quality control on TCBS agar.

Biology & Microbiology

The evolutionary process by which new species arise is called ________

a. gene flow b. genetic drift c. speciation d. natural selection e. directional selection

Biology & Microbiology

The reason that this insect can ‘skate’ across the water in a pond is _____

1.its legs make covalent bonds with the water 2.cohesion of the water molecules keeps it from sinking 3.the pH of the water is lower than the pH of the insect’s legs 4.salt in the pond buffers the water so the insect does not sink

Biology & Microbiology

The component of the gram-negative outer membrane called endotoxin is also known as _______

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

Biology & Microbiology