The energy required for diffusion of a solute across a cell membrane is: the kinetic energy of the solute. a matter/antimatter reaction, similar to the one used in warp-speed propulsion expended by the cell. expended by a transport protein.

Which of the following is an example of active transport? Simple diffusion Protein pumps Facilitated diffusion All of the above

Which of the following characteristics may be used to describe Active Transport? Select all that apply. occurs without a transporter protein requires an energy source shows saturation kinetics (has a maximum rate) can occur against a concentration gradient (i.e. uphill)

One of the following Is not a characteristic of the second Active transport: a- Using the hydrolysis of ATP directly. b- No need for carrier protein C- The movement of substance is with its concentration. d- All of the above

One of the most important substances to be transported into cells by facilitated diffusion is: water sodium lipid glucose

Which of the following statements is correct about passive diffusion? Select one: A) It is a process in which molecules move from a region of lower concentration to one of higher concentration (or up a concentration gradient). B) It is a process in which molecules move from a region of higher concentration to a region of lower concentration (or down a concentration gradient). C) It requires an expenditure of energy by the cell. D) It may require a transport protein. E) It involves movement of molecules down a concentration gradient and may require a transport protein.

An ion gradient is a source of potential energy that drives secondary transport processes in cells. True False

The following table depicts the rate of transport of a molecule into a cell as the external concentrations are changed. Based on what you know about the characteristics of membrane transport, the molecule is most likely transported by: a) passive transport b) simple diffusion across the membrane c) facilitated diffusion d) active transport

Diatomic oxygen (O2) exhibits which of the following membrane transport movements? A. it is not able to cross the membrane by passive transport, because it is big, polar, and inorganic it is not able to cross the membrane by active transport, because it is big, polar, and inorganic it is able to cross the membrane by facilitated diffusion, because it is small, polar, and organic it is able to cross the membrane by active transport, because it is big, nonpolar, and organic it is able cross the membrane by simple diffusion, because it is small, nonpolar, and inorganic

Passive transport across the membrane mediated by a carrier—     would not be saturated by increasing amount of substance to be transported.     does not require energy (ATP).     can be driven in reverse.     moves the solute through the membrane in the “uphill” direction of their concentration gradient.     is faster than transport mediated by channel proteins.