BIOL1406 Lab 4 Module

T/F: Active transport, a process that uses energy in the form of ATP, requires a membrane protein.

True

Transport pumps require: a. a membrane protein and energy input b. energy input but no carrier protein c. a membrane protein, but no energy investment d. neither a membrane protein or energy investment

a. a membrane protein and energy input

When the concentration of molecules on both sides of a membrane is the same, the solution is: a. isotonic b. hypotonic c. hypertonic d. osmosis

a. isotonic

Which of the following transport processes do NOT require energy (i.e. are passive transport processes)? [mark all correct answers] a. simple diffusion b. membrane pumps c. endocytosis d. phagocytosis e. osmosis f. facilitated diffusion

a. simple diffusion e. osmosis f. facilitated diffusion

If the molecular weight cutoff of dialysis tubing is 10000 Daltons, which of the following substances would move through the membrane easily? Check all that apply. [mark all correct answers] a. water with a molecular weight of 18 b. urea with a molecular weight of 60 c. glucose with a molecular weight of 180 d. iodine with an atomic weight of 127 e. starch with a molecular weight of 22,600 f. albumin with a molecular weight of 66,000 g. ferricyanide with a molecular weight of 212 h. Insulin with a molecular weight of 5808

a. water with a molecular weight of 18 b. urea with a molecular weight of 60 c. glucose with a molecular weight of 180 d. iodine with an atomic weight of 127 h. Insulin with a molecular weight of 5808

What effect do you expect temperature to have on rate of diffusion and why? a. Temperature has no effect on rate of diffusion. b. Increasing temperature increases the rate of molecular motion, and thus the rate of diffusion. c. Increasing temperature denatures the structures involved in simple diffusion, and will slow down the rate of diffusion. d. Decreasing temperature results in a more rapid rate of diffusion because of a decrease in resistance of the solvent.

b. Increasing temperature increases the rate of molecular motion, and thus the rate of diffusion.

Ferricyanide (Fe(CN)6)3- is: a. a neutral molecule b. an anion c. a cation

b. an anion

The rate of diffusion of a solute: a. is directly proportional to its molecular weight. b. is inversely proportional to the square root of its molecular weight c. is proportional to its molecular weight squared. d. is not dependent on molecular weight

b. is inversely proportional to the square root of its molecular weight

The sodium-potassium pump uses energy to: a. Move sodium into the cell against its concentration gradient. b. move sodium out of the cell against its concentration gradient c. move sodium into the cell with its concentration gradient d. move sodium out of the cell with its concentration gradient

b. move sodium out of the cell against its concentration gradient

What feature of the cell membrane determines what can pass into and out of cells? a. the lipid bilayer b. proteins that are present in the membrane c. the cholesterol that is present in the cell membrane d. the types of ions dispersed within the lipid bilayer

b. proteins that are present in the membrane

The cell membranes of cells are: a. impermeable b. selectively permeable c. semi-permeable d. freely permeable

b. selectively permeable

Through active transport, sodium is pumped, against its concentration gradient to: a. the inside of the cell. b. the outside of the cell. c. either the inside or outside of the cell, depending on the needs of the cell.

b. the outside of the cell.

Facilitated diffusion requires: a. energy input and a membrane protein b. energy input but no carrier protein c. a membrane protein but no energy investment d. neither a membrane protein nor energy investment

c. a membrane protein but no energy investment

Which transport processes require the presence of a membrane protein? Check all that apply. [mark all correct answers] a. exocytosis b. simple diffusion c. facilitated diffusion d. osmosis e. active transport f. exocytosis g. secondary active transport

c. facilitated diffusion e. active transport g. secondary active transport

A membrane that allows all substances below a specific molecular weight to pass through is classified as: a. impermeable b. selectively permeable c. semi-permeable d. freely permeable

c. semi-permeable

Dialysis tubing is an example of a(n): a. impermeable membrane b. selectively permeable membrane c. semi-permeable membrane d. freely permeable membrane

c. semi-permeable membrane

Rank these four anions in order of increasing molecular weight: ferricyanide (Fe(CN)6)3-, bromide (Br-), chloride (Cl-), bicarbonate (HCO3-) a. bicarbonate, bromide, chloride, ferricyanide b. chloride, bromide, bicarbonate, ferricyanide c. ferricyanide, bromide, bicarbonate, chloride d. chloride, bicarbonate, bromide, ferricyanide

d. chloride, bicarbonate, bromide, ferricyanide

How is glucose transported into cells? a. simple diffusion b. osmosis c. active transport d. facilitated diffusion

d. facilitated diffusion

Simple diffusion requires: a. energy input and a membrane protein b. energy input but no carrier protein c. a membrane protein but no energy input d. neither a membrane protein nor energy investment

d. neither a membrane protein nor energy investment