TRANSPORT ACROSS THE MEMBRANE

Question 1

COMPOSITION OF PLASMA MEMBRANE

Answer 1

55% proteins
25% phospholipids
13% cholesterol
3% carbohydrates and
4% other kinds of lipids

Question 2

semipermeable, which means that it allows certain molecules and ions to pass across it and prevent others from doing so

Answer 2

CELL MEMBRANE

Question 3

In active transport, substances are transported against the gradient by the use of

Answer 3

ENERGY

Question 4

Ingestion of large particles is accomplished through

Answer 4

PHAGOCYTOSIS

Question 5

Ingestion of dissolved substances

Answer 5

PINOCYTOSIS

Question 6

net movement of molecules or ions from a region of higher solute concentration to a region of lower solute concentration

Answer 6

DIFFUSION

Question 7

rate of diffusion is measured by

Answer 7

the number of diffusing molecules passing through the membrane per unit time

Question 8

The rate at which a substance diffuses depends on

Answer 8

a. magnitude of the concentration difference across the membrane
b.size, and shape of the particles of solute
c. temperature

Question 9

TRUE OR FALSE:

Higher temperature increases the rate of the diffusion process because it increases the kinetic energy of molecules.

Answer 9

TRUE

Question 10

the kinetic movement of ions and molecules through membrane spaces without necessarily binding with the carrier proteins along the membrane

Answer 10

SIMPLE DIFFUSION

Question 11

requires ions and molecules to bind first to the carrier proteins so they can enter the cell.

Answer 11

FACILITATED DIFFUSION

Question 12

the simple diffusion of a solvent (water) across a membrane

Answer 12

OSMOSIS

Question 13

solvent or water molecules move from the solution that is more dilute to the solution in which there is a higher solute concentration

Answer 13

OSMOSIS

Question 14

higher in a solution with greater solute concentration

Answer 14

OSMOTIC PRESSURE

Question 15

the movement of solvent stops when

Answer 15

A. the two solutions reach equal concentration
B. when the osmotic pressure is equal on both sides of the semipermeable membrane.

Question 16

the separation of molecules on the basis of size and by their ability to diffuse through a semipermeable membrane

Answer 16

DIALYSIS

Question 17

TRUE OR FALSE:

Dialysis makes use of diffusion across a selective permeable membrane.

Answer 17

TRUE

Question 18

They contain small pores and allow the ions or crystalloid (such as sugar and salt which form two solutions with water) to pass through but not colloidal particles because they are much larger in size.

Answer 18

PARCHMENT AND CELLOPHANE

Question 19

Thus, in a mixture of crystalloid and colloids placed in a dialyzing bag that is immersed in distilled water, what is dialyze?

Answer 19

crystalloids dialyze out through the parchment

Question 20

In a mixture of crystalloid and colloids placed in a dialyzing bag that is immersed in distilled water, what is left inside?

Answer 20

COLLOIDS

Question 21

the solution outside the dialyzing bag

Answer 21

DIALYSATE

Question 22

In the test for proteins, what will appear if the proteins are present?

Answer 22

white precipitate or turbidity

Question 23

What is an indicator for the presence of the reducing sugar?

Answer 23

YELLOW OR RED PRECIPITATE

Question 24

any external solution that has a high solute concentration and low water concentration compared to body fluids. Thus, it has a tendency to shrink.

Answer 24

HYPERTONIC

Question 25

has a lower solute concentration compared to the intracellular solute concentration.

Answer 25

HYPOTONIC