Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Bio II > LESSON 14: Intro to cell membranes > Flashcards

LESSON 14: Intro to cell membranes Flashcards

1
Q

What is the typical protein:lipid ratio in the plasma membrane?

A

The typical protein:lipid ratio in the plasma membrane is about 1:1.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

True or False: The inner mitochondrial membrane has a higher protein:lipid ratio than the plasma membrane.

A

True.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Fill in the blank: The protein:lipid ratio in membranes can vary greatly, with the highest ratios found in __________.

A

mitochondrial membranes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which type of membrane generally has a lower protein:lipid ratio?

A

Myelin membranes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a common protein:lipid ratio found in myelin membranes?

A

About 1:10.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Short answer: Why do membranes with higher protein:lipid ratios tend to have more complex functions?

A

Because proteins are responsible for various functions such as transport, signaling, and enzymatic activity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Multiple choice: Which cellular membrane has the highest protein:lipid ratio?

A

Inner mitochondrial membrane.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

True or False: The protein:lipid ratio is the same in all cellular membranes.

A

False.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the protein:lipid ratio in the endoplasmic reticulum?

A

Approximately 1:2.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Fill in the blank: The __________ membrane has a protein:lipid ratio of about 1:4.

A

Golgi apparatus.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Short answer: What factors influence the protein:lipid ratio in cellular membranes?

A

Factors include membrane function, cellular environment, and specific cell type.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Multiple choice: Which membrane is likely to have a lower protein:lipid ratio?

A

Plasma membrane.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

True or False: Higher protein:lipid ratios are associated with membranes involved in metabolic processes.

A

True.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the protein:lipid ratio in the nuclear membrane?

A

Approximately 1:3.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Fill in the blank: The protein:lipid ratio can indicate the __________ of a membrane.

A

functional complexity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Short answer: Why do membranes with lower protein:lipid ratios have fewer functions?

A

Because they contain fewer proteins for processes such as transport and signaling.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Multiple choice: Which membrane is characterized by a high protein:lipid ratio?

A

Inner mitochondrial membrane.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

True or False: The protein:lipid ratio is irrelevant to membrane function.

A

False.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the protein:lipid ratio in the lysosomal membrane?

A

Approximately 1:5.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Fill in the blank: The __________ membrane is less protein-rich compared to others.

A

myelin.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Short answer: How does the protein:lipid ratio affect membrane fluidity?

A

Higher protein content can decrease fluidity, while lower content allows more fluidity.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Multiple choice: Which of the following membranes has the lowest protein:lipid ratio?

A

Myelin membrane.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

True or False: The protein:lipid ratio is constant throughout an organism’s lifespan.

A

False.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the protein:lipid ratio in the plasma membrane of red blood cells?

A

Approximately 1:1.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Fill in the blank: Membranes involved in __________ typically have higher protein content.
transport and signaling.
26
What is the primary function of channel proteins?
To facilitate the passive movement of ions and molecules across the membrane.
27
True or False: Carrier proteins require energy to transport substances across the membrane.
False
28
Fill in the blank: ________ proteins are involved in the transport of substances against their concentration gradient.
Active transport
29
What is an example of a channel protein?
Aquaporins, which facilitate water transport.
30
What role do receptor proteins play in cell membranes?
They bind to specific molecules (ligands) and initiate cellular responses.
31
Multiple Choice: Which of the following is NOT a function of membrane proteins? A) Transport B) Enzymatic activity C) Energy production D) Signal transduction
C) Energy production
32
What type of membrane protein spans the entire lipid bilayer?
Integral proteins
33
True or False: Peripheral proteins are tightly bound to the membrane.
False
34
What is the function of glycoproteins in the membrane?
They play a key role in cell recognition and signaling.
35
Fill in the blank: ___________ proteins can act as enzymes to catalyze reactions at the membrane surface.
Membrane
36
What is an example of a receptor protein?
Insulin receptor, which binds insulin and regulates glucose uptake.
37
How do transport proteins contribute to homeostasis?
They regulate the movement of substances in and out of the cell.
38
Multiple Choice: Which type of membrane protein is primarily involved in cell adhesion? A) Transport proteins B) Receptor proteins C) Adhesion proteins D) Enzymatic proteins
C) Adhesion proteins
39
What is the function of enzyme proteins in the membrane?
To catalyze biochemical reactions at the membrane surface.
40
True or False: All membrane proteins are embedded in the lipid bilayer.
False
41
Fill in the blank: ___________ proteins assist in the movement of substances across the membrane without energy input.
Facilitated diffusion
42
What is an example of a protein that functions in signal transduction?
G protein-coupled receptors.
43
What distinguishes integral proteins from peripheral proteins?
Integral proteins penetrate the lipid bilayer, while peripheral proteins are attached to the surface.
44
Multiple Choice: Which of the following functions is associated with transport proteins? A) Cell communication B) Selective permeability C) Energy production D) DNA replication
B) Selective permeability
45
What is the role of cholesterol in the membrane?
To maintain membrane fluidity and stability.
46
What is an example of a protein that acts as a cell adhesion molecule?
Cadherins.
47
True or False: Membrane proteins can only perform one function.
False
48
What is the function of transporters in the membrane?
To move specific substances across the membrane.
49
Multiple Choice: Which type of membrane protein can change shape to transport substances? A) Channel proteins B) Carrier proteins C) Receptor proteins D) Structural proteins
B) Carrier proteins
50
What is the role of proteins in cell signaling?
They transmit signals from the outside to the inside of the cell.
51
Fill in the blank: ___________ proteins can form channels that allow ions to pass through the membrane.
Ion
52
What is the function of structural proteins in the membrane?
To provide support and shape to the cell.
53
True or False: Membrane proteins are not involved in the transport of water across the membrane.
False
54
What is an example of a carrier protein?
Glucose transporter (GLUT).
55
Multiple Choice: Which membrane protein is involved in the active transport of sodium and potassium? A) Sodium-potassium pump B) Aquaporin C) Glucose transporter D) Insulin receptor
A) Sodium-potassium pump
56
What is the function of anchoring proteins in the membrane?
To attach the membrane to the cytoskeleton or extracellular matrix.
57
Fill in the blank: Membrane proteins help in ___________ by facilitating communication between cells.
Cell signaling
58
What is an example of a protein involved in cell-cell recognition?
Selectins.
59
True or False: Membrane proteins can influence the permeability of the membrane.
True
60
What is a transmembrane protein?
A protein that spans the entire lipid bilayer of a cell membrane.
61
True or False: Transmembrane proteins are only involved in transport across the membrane.
False
62
Fill in the blank: The hydrophobic regions of transmembrane proteins are typically composed of ______ amino acids.
nonpolar
63
What role do hydrophilic amino acids play in transmembrane proteins?
They interact with the aqueous environment inside and outside the cell.
64
Multiple Choice: Which of the following is NOT a function of transmembrane proteins? A) Transport B) Signaling C) Energy production D) Cell adhesion
C) Energy production
65
What is the primary structure of a transmembrane protein composed of?
A sequence of amino acids linked by peptide bonds.
66
True or False: Transmembrane proteins can exist in a single alpha-helix conformation.
True
67
What is the significance of the amino acid sequence in a transmembrane protein?
It determines the protein's structure and function.
68
Fill in the blank: The ______ model describes the arrangement of proteins in the lipid bilayer.
fluid mosaic
69
Multiple Choice: Which of the following amino acids is most likely to be found in the hydrophilic regions of a transmembrane protein? A) Leucine B) Glycine C) Isoleucine D) Phenylalanine
B) Glycine
70
What is the secondary structure commonly found in transmembrane proteins?
Alpha helices or beta sheets.
71
True or False: Transmembrane proteins can function as receptors.
True
72
What is the tertiary structure of a transmembrane protein?
The overall 3D shape formed by the folding of its polypeptide chains.
73
Fill in the blank: Transmembrane proteins can facilitate ______ across the membrane.
cell signaling
74
Multiple Choice: Which type of transmembrane protein primarily transports ions? A) Channel proteins B) Carrier proteins C) Receptor proteins D) All of the above
D) All of the above

Bio II (14 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions