Which of the following characteristics of membranes does the term "selective permeability" refer to?
a. permits some molecules to cross the membrane while preventing others from crossing
b. restricts the passage of polar molecules
c. provides an anchor between adjacent cells
d. allows membrane proteins to float freely within the membrane
a
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Which of the following represents a kingdom?
a. Animalia b. Chordata c. Canis d. Canidae e. Mammalia
Which has the strongest effect on whether stomata are open or closed?
a. sunlight b. ion concentrations in the xylem c. CO2 concentration d. O2 concentration e. abscisic acid
The movement of a substance in solution from an area of higher concentration to an area of lower concentration across a selectively permeable membrane in a living organism is called:
What will be an ideal response?
Ammonia is produced when cells break down
a. fats. b. amino acids. c. carbohydrates. d. nucleic acids. e. vitamins.