In which of the following ways are archaea similar to eukaryotic cells?
a. size
b. shape
c. presence of histones
d. DNA polymerases
e. presence of operons
ANSWER: c
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If a set of genes is induced in the presence of the controlling substance, it is referred to as ________ control.
Fill in the blank(s) with the appropriate word(s).
Cilia and flagella are most directly involved in:
a. metabolism. b. movement. c. maintaining homeostasis. d. muscle contraction. e. cell signaling
The concentration of calcium in a cell is 0.3%. The concentration of calcium in the surrounding fluid is 0.1%. How could the cell obtain more calcium?
A. passive transport B. diffusion C. osmosis D. active transport
Fluorescent dyes are able to detect viable cells in a sample
a. If they are dividing. b. if their cell walls are not intact. c. if the green fluorescent dye penetrates the cell. d. if the red fluorescent dye penetrates the cell.