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
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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
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.
The center for control of motor skills and posture is
the a. cerebrum. b. pons. c. cerebellum. d. thalamus. e. hypothalamus.
The trp operon is typically characterized as being both under negative control and repressible
Indicate whether the statement is true or false