If a cell contains lysosomes, what type of cell must it be?
a. a fungal cell
b. a prokaryotic cell
c. an animal cell
d. a plant cell
Answer: c. an animal cell
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If the genetic code contained six nucleotides instead of four, and each amino acid were specified by a single codon, how many unique codons would exist?
a. 144 b. 96 c. 216 d. 256
Scientists are always thinking about ways to improve experimental design. In the text's potato chip experiment, which
of these changes would produce the most effective design?
a. Show a different movie. b. Exclude teenagers as group members. c. Collect uneaten chip remains and weigh them for both groups. d. Provide free drinks before the experiment. e. Use a smaller theater.
Striated muscle has light and dark bands. The light bands are called ________, whereas the dark bands are called ________
A) Z lines; M lines B) H zones; M zones C) A bands; I bands D) I bands; A bands E) M lines; A bands
Ions are atoms or molecules that carry an electrical charge sure to the gain or loss of:
A) protons B) electrons C) neutrons D) positrons