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Biology > 3.3 Cell Membrane > Flashcards

3.3 Cell Membrane Flashcards

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1
Q

The double-layer of phospholipids that forms a boundary between a cell and the surrounding environment and controls the passage of materials into and out of a cell. is known as?

A

Cell Membrane

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2
Q

A molecule that forms a double-layered cell membrane, consists of glycerol, a phosphate group, and two fatty acids is?

A

Phospholipid

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3
Q

A model that describes the arrangement and movement of the molecules that make up a cell membrane is?

A

Fluid Mosaic Model

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4
Q

What is condition or quality of allowing some, but not all, materials to cross a barrier or membrane known as?

A

Selective Permeability

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5
Q

Protein that detects a signal molecule and performs an action in response is?

A

A Receptor

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6
Q

A cell membrane consist of double layer of phospholipids inter spread with a variety of other what?

A

Molecules

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7
Q

What are the three basic parts of a phospholipid molecule?

A
  • Charged phosphate group
  • Glycerol
  • Two fatty acid chains
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8
Q

Charged phosphate group, glycerol, and two fatty acid chains are the basic parts of what?

A

A Phospholipid Molecule

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9
Q

Which part(s) of the phospholipid are charged or polar?

A

Phosphate group and glycerol

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10
Q

Which part(s) of the phospolipid are nonpolar?

A

Fatty acid chains/tail

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11
Q

What strengthens the cell membrane?

A

Cholesterol

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12
Q

What helps materials cross the membrane and are also part of the cytoskeleton?

A

Phospholipid

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13
Q

What helps identify cell types?

A

Carbohydrates

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14
Q

True or False:
A membrane is fluid, because the phospholipids in each layer can move from side to side, in and out of the cell, by sliding past each other, and by spinning in circles.

A

False

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15
Q

True or False:

A selectively permeable membrane allows all molecules to cross.

A

False

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16
Q

A ————– detects a signal molecule and carries out an action in response.

A

Receptor

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17
Q

A ligand is a molecule that acts as a —————- when it binds to a —————-.

A

Signal, Receptor

18
Q

A ligand that …………….. cross the cell membrane can bind to an intracellular receptor.

A

CAN Cross

19
Q

A ligand that cannot cross the cell membrane can send a message to a cell by ……………….. a membrane receptor, which then changes shape.

A

Binding To

20
Q

What means that the cell membrane allows some, but not all, molecules to cross?

A

Selective Permeability

21
Q

The fluid mosaic model describes the arrangement of what, that can make up a cell membrane? The model include both the fluidity of the membrane and the variety of molecules that make up the membrane.

A

Molecules

22
Q

True or False:

The polar head of the phospholipid forms hydrogen bonds with water molecules.

A

True

23
Q

True or False:

Nonpolar tails are attracted to each other and are repelled by water.

A

True

24
Q

The cell membrane is made up of two phospholipid layers embedded with other materials known as? (3)

A
  • Proteins
  • Carbohydrates
  • Cholesterol
25
Q

True or False:

The cholesterol is not located between the two fatty acid chains.

A

False

26
Q

The cholesterol is located between where?

A

Two Fatty Acid Chains

27
Q

True or False:

The cell membrane is flexible and non rigid.

A

True

28
Q

Can proteins embedded in the membrane flip vertically?

A

No

29
Q

What regulates what moves into and out of the cell?

A

Cell Membrane

30
Q

The cell membrane has the property of selective permeability, which it means it allows what?

A

Some but not all materials to cross

31
Q

True or False:
Selective permeability enables a cell to maintain homeostasis in spite of unpredictable changing conditions outside of the cell.

A

True

32
Q

A cell needs to maintain certain conditions to carry out its functions, it must control the what? Of certain molecules and ions.

A

Import and Export

33
Q

True or False:
How a particular molecule crosses the membrane depends on the molecules size, polarity, and concentration inside the versus outside the cell.

A

True

34
Q

Small nonpolar molecules easily pass through the cell membrane, small polar molecules are transported via what?

A

Proteins and large molecules are moved in vesicles

35
Q

What is a protein that detects a signal molecule and performs an action in response?

A

Receptor

36
Q

What two major rectors are present in your cells?

A

Interacellular and Membrane

37
Q

Interacellular means what?

A

Within or Inside a Cell

38
Q

True or False:

A molecule that cant cross the membrane may bind to a phospholipid in the cell membrane?

A

False

-A molecule binds to a receptor in the cell membrane

39
Q

Why is it critical that when a molecule and receptor combine that it changes shape?

A

Because it affects how a receptor interacts with other molecules

40
Q

When a receptor changes shape does that only happen on the outside of the cell?

A

No, it changes shape on the inside as well

Biology (4 decks)

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