The simultaneous movement of sucrose into a cell against its concentration gradient and protons into a cell with their concentration gradient is best described as an example of
a. symport.
b. passive diffusion.
c. antiport.
d. facilitated diffusion.
e. active transport.
A
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Phenotypic similarities that provide no information about shared ancestry are called
a. homologies. b. homoplasies. c. morphological. d. anatomical. e. mosaic characters.
Which statement about receptors is false?
a. They are highly selective. b. They are also called ligands. c. They are proteins or glycoproteins. d. They are found inside the cell and on the cell surface. e. They are activated by binding to a signaling molecule.
How are the membranes of animal cells in winter able to remain fluid when the weather becomes extremely cold?
a. The percentage of both unsaturated phospholipids and cholesterol increases. b. The percentage of saturated phospholipids in the membrane decreases. c. The percentage of unsaturated phospholipids in the membrane decreases. d. The percentage of cholesterol molecules in the membrane increases.
Name the three key mechanisms important for maintaining the organization of cells into tissues
What will be an ideal response?