Which is true about mediated transport across cell membranes?
A. As the concentration gradient across a membrane increases, the transport rate always increases.
B. It refers both to simple diffusion and to the active transport of molecules.
C. It is nonspecific; any transporter can transport any molecule across the cell membrane.
D. It is characterized by saturable carriers and a maximum velocity of transport.
E. It refers to the movement of ions through protein channels.
Answer: D
You might also like to view...
Pure antibody preparations specific for a single antigenic determinant are called ________ antibodies
Fill in the blanks with correct word
Animal fat deposits provide an energy source
Indicate whether the statement is true or false
Production of new primary oocytes by mitosis continues throughout a woman's life.
Answer the following statement true (T) or false (F)
The process of synthesizing glucose from non-carbohydrates is called
A) glycogenolysis. B) glycogenesis. C) glycolysis. D) gluconeogenesis. E) glucose reclamation.