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Multiple choice 1 > 1 choice answer > Flashcards

1 choice answer Flashcards

1
Q

What are the two main components of the lipid bilayer?

A

Phospholipids and cholesterol

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2
Q

True or False: The lipid bilayer is a selectively permeable barrier.

A

True

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3
Q

Fill in the blank: The lipid bilayer is composed of a double layer of ________ molecules.

A

Phospholipid

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4
Q

What is the definition of selective permeability?

A

Selective permeability is the property of a membrane that allows certain substances to pass through while preventing others from passing.

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5
Q

True or False: Selective permeability is essential for maintaining homeostasis in cells.

A

True

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6
Q

What are some factors that affect the selectivity of a membrane?

A

Size, charge, and solubility of molecules

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7
Q

Fill in the blank: Selective permeability is achieved through the presence of ________ in the membrane.

A

protein channels or transporters

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8
Q

What is a concentration gradient?

A

A concentration gradient is the difference in concentration of a substance between two areas.

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9
Q

True or False: Diffusion is a passive process.

A

True

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10
Q

Fill in the blank: Diffusion is the movement of particles from an area of ______ concentration to an area of ______ concentration.

A

higher, lower

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11
Q

How does temperature affect the rate of diffusion?

A

Higher temperatures generally increase the rate of diffusion.

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12
Q

What role does the concentration gradient play in the process of diffusion?

A

The concentration gradient drives the movement of particles from areas of higher concentration to areas of lower concentration.

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13
Q

What is the relationship between temperature and the rate of diffusion?

A

As temperature increases, the rate of diffusion also increases.

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14
Q

How does the size of particles affect the rate of diffusion?

A

Smaller particles diffuse faster than larger ones.

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15
Q

True or False: Diffusion occurs faster in gases compared to liquids.

A

True

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16
Q

What role does concentration gradient play in diffusion?

A

A steeper concentration gradient leads to faster diffusion.

17
Q

Fill in the blank: The _______ the distance, the slower the rate of diffusion.

A

greater

18
Q

What is the key difference between active transport and facilitated diffusion?

A

Active transport requires energy input to move molecules against their concentration gradient, while facilitated diffusion does not require energy and moves molecules along their concentration gradient.

19
Q

True or False: Active transport always moves molecules against their concentration gradient.

A

True

20
Q

Which type of transport process requires the use of transport proteins: active transport or facilitated diffusion?

A

Facilitated diffusion

21
Q

What is an example of a molecule that is typically transported through active transport?

A

Sodium ions (Na+)

22
Q

What is osmosis?

A

The movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

23
Q

True or False: In osmosis, water moves from an area of higher solute concentration to an area of lower solute concentration.

A

False

24
Q

Fill in the blank: Osmosis is the movement of ________ molecules across a selectively permeable membrane.

A

water

25
Q

What does it mean for a solution to be hypertonic?

A

A solution with a higher concentration of solutes compared to another solution.

26
Q

Which way does water move in relation to a hypertonic solution?

A

Water moves out of the cell into the hypertonic solution.

27
Q

What is the definition of a hypotonic solution?

A

A solution with a lower concentration of solutes compared to another solution.

28
Q

True or False: In a hypotonic solution, water moves into the cell causing it to swell.

A

True

29
Q

What happens to a red blood cell in a hypotonic solution?

A

It will swell and potentially burst due to water entering the cell.

30
Q

What is the definition of an isotonic solution?

A

A solution with the same concentration of solutes compared to another solution.

31
Q

True or False: In an isotonic solution, there is no net movement of water into or out of the cell.

A

True

32
Q

True or False: Phagocytosis is a form of endocytosis.

A

True

33
Q

Fill in the blank: Phagocytosis is carried out by specialized cells called _______.

A

Phagocytes

34
Q

What is exocytosis?

A

Exocytosis is the process by which cells release substances outside of the cell through fusion of vesicles with the plasma membrane.

35
Q

True or False: Exocytosis is an active transport process.

A

True

36
Q

Fill in the blank: Exocytosis is the opposite process of ____________.

A

Endocytosis

Multiple choice 1 (2 decks)

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