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Deck 1 > Membrane transport mechanism > Flashcards

Membrane transport mechanism Flashcards

1
Q

1) What is (are) the main difference(s) between passive transport and active transport?
- Passive transport does not require any cellular proteins; active transport requires cellular proteins.
- Active transport requires cellular energy for substances to cross the cell membrane; passive transport does not.
- Active transport works against gravity (for example, upwards from the roots of a tree); passive transport works with gravity
- Passive transport occurs primarily in single-cell organisms; active transport occurs primarily in multi-cellular organisms.

A

Active transport requires cellular energy for substances to cross the cell membrane; passive transport does not.

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2
Q

2) Which example(s) of cell tranposrt does not require chemcial energy?
- neither A nor B
- potato slice is placed in water and water molecules from inside the potato move into the surrouning water.
- both A and B
- Drops of blue food coloring are placed in water and spread throughout the water, turning it blue.

A

Correct answer: both A and B

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3
Q

Endocytosis is an example of what type of transport?

  • passive transport
  • active transport
  • osmosis
  • facilitated diffusion
A

active transport–

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4
Q 
All of the following are types of passive transport except
endocytosis
diffusion
facilitated diffusion
osmosis
A

endocytosis

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5
Q

What is the role of ATP in the process of active transport?

  • It lengthens the fatty acid chains in the membrane.
  • It weakens the membrane, allowing molecules to pass through more easily.
  • It provides the energy to transport the cell in its environment.
  • It provides the energy that cells need to move molecules against a concentration gradient.
A

It provides the energy that cells need to move molecules against a concentration gradient.

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6
Q 
Facilitated diffusion allows certain kinds of compounds that are normally blocked by the cell membrane to cross the cell membrane. All of the following are examples of compounds that move by facilitated diffusion except
 glucose
water
potassium
sodium
A

water

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7
Q 
Exocytosis is an example of what type of transport?
 facilitated diffusion
osmosis
active transport
passive transport
A

active transport

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8
Q

Which of the following is an example of osmosis?

  • Intesintal cells use osmosis to absorb nutrients from food.
  • The human body uses osmosis to move antibodies out of cells.
  • A single-celled organism uses osmosis to take in food particles.
  • A plant’s roots use osmosis to absorb water from the soil.
A

A plant’s roots use osmosis to absorb water from the soil.

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9
Q

9) How do substances move into or out of the cell through endocytosis?
- Substances are engulfed by a cell’s plasma membrane and brought into the cell in a vesicle.
- Substances are engulfed by a cell’s plasma membrane to form a channel into the cell.
- Substances are engulfed by a vesicle, which crosses the cell membrane.
- Substances cross the cell membrane through protein channels.

A

Substances are engulfed by a cell’s plasma membrane and brought into the cell in a vesicle.

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10
Q

10) What kind of material is transported through osmosis?
- oxygen
- blood
- water
- nitrogen-fixing bacteria

A

water

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11
Q

In facilitated diffusion, what are the special channels that help substances cross the cell membrane made of?

  • proteins
  • nucleic acids
  • water molecules
  • carbon bonds
A

proteins

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12
Q

Which statement is true regarding active transport?

Substances can only move across the cell membrane if they are water soluble.

Substances can only move into cells, not out of cells.

Substances do not require additional energy to move in and out of cells.

Substances can move from areas of low concentration to areas of high concentration.

A

Substances can move from areas of low concentration to areas of high concentration

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13
Q

How does particle size affect a molecule’s transport across a cell membrane?

It is easier for large molecules to diffuse across the cell membrane.

Particle size does not affect a molecule’s transport speed across the cell membrane.

Particle size is less important than particle shape for calculating transport speed.

It is easier for small molecules to diffuse across the cell membrane.

A

It is easier for small molecules to diffuse across the cell membrane.

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14
Q

What causes the diffusion process to stop?

The concentration of materials outside the cell becomes greater than the concentration of materials inside the cell.

The concentration of materials inside the cell becomes greater than the concentration of materials outside of the cell.

The concentration of materials inside and outside the cell becomes equal.

The concentration of materials cannot be changed because ATP is no longer available.

A

The concentration of materials outside the cell becomes greater than the concentration of materials inside the cell.

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15
Q

Suppose that you stayed in the bathtub too long, causing your hands and feet to look wrinkled. What kind of passive cell transport causes this effect?

diffusion

exocytosis

facilitated diffusion

osmosis

A

osmosis

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16
Q

Which best describes the role of endocytosis in cell transport?

Endocytosis moves substances into the cell.

Endocytosis moves substances out of the cell.

Endocytosis moves substances into or out of the cell, down a concentration gradient.

Endocytosis moves substances into or out of the cell, against their concentration gradient.

A

Endocytosis moves substances into the cell

17
Q

In general, in what direction does a diffusing substance move?

it depends on the substance being diffused

down its concentration gradient

in the opposite direction than it would normally move

up its concentration gradient

A

down its concentration gradient

18
Q

Which best describes the role of exocytosis in cell transport?

Exocytosis moves substances out of the cell.

Exocytosis moves substances into or out of the cell, against their concentration gradient.

Exocytosis moves substances into or out of the cell, down a concentration gradient.

Exocytosis moves substances into the cell.

A

Exocytosis moves substances out of the cell.

19
Q

Correct order of simple diffusion

a) gases > small uncharged particles > water > large uncharged polar molecules > charged particles > charged large polar molecules
b) gases > small uncharged particles > water >charged particles> large uncharged polar molecules charged particles > charged large polar molecules
c) gases > small uncharged particles > charged particles > large uncharged polar molecules > charged particleswater > charged large polar molecules
d) gases > small uncharged particles > large uncharged polar molecules > waterl > charged particles > charged large polar molecules

A

•gases > small uncharged particles > water > large uncharged polar molecules > charged particles > charged large polar molecules

20
Q

W/c of the following will cause an increase in diffusion rate?

a) increase concentration gradient
b) increase viscosity
c) decrease temperature
d) both a and b

A

a

21
Q

W/c of the following is indirectly proportional to diffusion rate? (choose as many as possible)

a) concentration gradient
b) area of diffusion
c) temperature
d) viscosity
e) radius of particles

A

radius & viscosity

22
Q

True or False: Simple diffusion can be carrier mediated and channel mediated

A

f

23
Q

I.Carrier - Mediated bind substances on one side of the membrane & release them to the opposite side
II. Channel - Mediated transmembrane proteins which act as water-filled pores with gates
A) i. is T
B) II. is F
c) both is t
d) neither is t

A

c

24
Q

open or close due to binding of a chemical

a) Mechanical Gating
b) Voltage - gated Gating
c) Ligand Gating

A

LG

25
Q

open or close to changes in electrical potential

a) Mechanical Gating
b) Voltage - gated Gating
c) Ligand Gating

A

VG

26
Q

accounts for the RMP of cells

a) Mechanical Gating
b) Voltage - gated Gating
c) Ligand Gating

A

VG

27
Q

open or close due to cellular deformation

a) Mechanical Gating
b) Voltage - gated Gating
c) Ligand Gating

A

A

28
Q

Sodium channels are

a) Mechanical Gating
b) Voltage - gated Gating
c) Ligand Gating

A

vg

29
Q

All of the ff. is true about osmosis except?

a) no energy required
b) low osmotic pressure to greater o.p
c) low low water concentration of water to lower
d) neither

A

c

30
Q

True or false: Facilitated diffusion requires energy

A

false

31
Q

All of the ff affect osmosis except?

a) number of dissociated ions
b) molar concentration
c) absolute temperature
d) neither

A

d

32
Q

True or false: Sodium potassium pump requires energy

A

active transport

33
Q

T or false: In sodium potassium pump, sodium is being pumped out while potassium is being pumped in

A

T

34
Q

Na-K pump is

a) antiport
b) symport
c) simple diffusion
d) facilitated diffusion

A

a

35
Q

Sodium-glucose is

a) antiport
b) symport
c) simple diffusion
d) facilitated diffusion

A

b

36
Q

2 influential factors that maintain resting potential

A

Na-K pump

K+ leak

37
Q

W/c of the ff. are abunadant inside:

a) Na
b) K
c) Cl
d) Ca

A

b

38
Q

W/c of the ff. is true

a) 3 K is pump inside and 2 Na is outside
b) 2K in- 3 Na out
c) 3k out- 2 na in
d) 2k out - 3na in

A

b

39
Q

T/F: Inside of cell is more negative than the outside

A

T

Deck 1 (4 decks)

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