Which of the following descriptions of movement of molecules across the plasma membrane is correct?
a. if two similar molecules can both combine with the same carrier, the presence of one of these molecules decreases the rate of entry of the other.
b. in simple diffusion, the rate of transport of a molecule is directly proportional to the molecule's extracellular concentration.
c. when a carrier becomes saturated, the maximum rate of transport is reached.
d. two of these answers.
e. all of these answers.
E
You might also like to view...
Shivering in response to a cold draft is an example of
A. feedforward regulation. B. a homeostatic mechanism. C. Two of the choices are correct. D. positive feedback. E. acclimation.
Which of the following is an androgen?
A) Estrogen B) Testosterone C) Progesterone D) Luteinizing hormone (LH) E) Follicle-stimulating hormone (FSH)
The nerve that supplies motor control to the stomach is the:
a. vagus b. sphanchic nerve c. spnial nerve T8 d. all of the above
The femoral region is the
A. calf. B. armpit. C. hollow behind the knee. D. neck. E. thigh.