Osmoregulation is best defined as:
A. the control of osmotic pressure through
regulation of water and solute levels.
B. the movement of water from areas of lower
solute concentration to areas of higher solute
concentration.
C. the difference in solute concentration on
the two sides of a membrane.
D. the movement of water through
aquaporins.
E. the regulation of membrane permeability.
A
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Which of the following are adhesion proteins that are present in both choanoflagellates and animals?
A. actins B. pectins C. cadherins D. hemoglobins
The earliest cells most likely ____
a. were prokaryotic cells b. did not have a nucleus but had membrane-bound organelles c. used oxygen gas in order to thrive successfully d. used energy from the sun e. were multicellular
Refer to Figure 44-2. Which cell type is the source of antibodies?
a. A only b. B only c. C only d. D only e. both A and B
In this sample of cells, what stage of the cell cycle are most of the cells in?
A) G1 B) S C) G2 D) mitosis