Restriction enzymes are obtained from ________.
A) archaea
B) eukaryotes
C) viruses
D) bacteria
D) bacteria
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Two solutions A and B are separated by a membrane, which is permeable to water but not salts. Solution A is a 2%
NaCl solution, while solution B is a 3% NaCl solution. Which of the following will occur? a. Water will move from side B to side A. b. Water will move from side A to side B. c. Salt will move from side B to side A. d. Salt will move from side A to side B. e. Neither salt or water will move across the membrane.
All cells possess a plasma membrane, which functions to _____.
A) enclose the cell B) isolate the cell from random disturbances in the environment C) allow metabolic events to occur in an orderly fashion D) all of the choices
Carotenoids are hydrophobic accessory pigments and vary widely in the color they can absorb
Indicate whether the statement is true or false.
In the mosses, archegonia produce
A. eggs. B. zygotes. C. diploid cells. D. sperm.