Magnesium has 12 protons. How many electrons are
in its second energy level?
a. 2
b. 4
c. 6
d. 8
e. 10
Answer: d
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What is an organic compound?
A. A molecule that contains a nitrogen skeleton B. A molecule that contains both carbon and nitrogen C. A molecule that contains carbon bonded to other elements D. A molecule that contains nitrogen bonded to other elements
Which one of the following statements about DNA is incorrect?
A. DNA typically exists in cells as a double helix. B. There are 10 base pairs per turn in a helical DNA molecule. C. DNA has a diameter of approximately 2 nanometers. D. The strands in DNA wrap around each other in a helix that coils to the right. E. All of the statements about DNA are correct.
A carbohydrate consists of
a. amino acid units. b. one or more sugar units. c. lipid droplets. d. glycerol.
E. coli O157:H7 and E. coli O111:H7 differ in their:
What will be an ideal response?