Select the best response to the question.

?What is the purpose of a simple stain?

A) To identify gram-positive bacteria.
B) To provide additional information about the cell based on the composition of the cell wall.
C) To identify gram-negative bacteria.
D) To provide contrast to better illustrate the structure and arrangement of bacterial cells.


D

Biology & Microbiology

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A short RNA chain is synthesized as the first nucleotides in a new DNA strand by the enzyme ____ to provide a ____

for DNA elongation.

a. topoisomerase; 3¢ hydroxyl group b. primase; 3¢ hydroxyl group c. primase; 5¢ hydroxyl group d. DNA polymerase; 5¢ phosphate group e. DNA polymerase; 3¢ hydroxyl group

Biology & Microbiology

Which discovery was determined about DNA from x-ray diffraction data?

a. DNA is uniform in length. b. DNA is short and narrow. c. DNA has a repeating pattern. d. DNA molecules are flat. e. DNA molecules are round.

Biology & Microbiology

The center for control of motor skills and posture is

the a. cerebrum. b. pons. c. cerebellum. d. thalamus. e. hypothalamus.

Biology & Microbiology

The trp operon is typically characterized as being both under negative control and repressible

Indicate whether the statement is true or false

Biology & Microbiology