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Questions and Answers
Where are plasma membrane proteins typically located?
Where are plasma membrane proteins typically located?
- Attached to the cytoskeleton.
- Inside the nucleus of the cell.
- Embedded in the lipid bilayer or attached to the membrane surface. (correct)
- Recessed within the mitochondria.
What is the role of cholesterol in human and animal cells?
What is the role of cholesterol in human and animal cells?
- It provides rigidity to the plasma membrane. (correct)
- It facilitates cellular respiration.
- It acts as a carbohydrate source.
- It functions as a protein structure.
What primary function does the plasma membrane serve?
What primary function does the plasma membrane serve?
- Storing genetic information.
- Controlling movement of substances in and out of the cell. (correct)
- Producing proteins.
- Synthesizing energy.
Which of the following statements about plasma membrane composition is incorrect?
Which of the following statements about plasma membrane composition is incorrect?
Which of the following components is NOT a function associated with the plasma membrane?
Which of the following components is NOT a function associated with the plasma membrane?
Which component of the cytoskeleton is the largest?
Which component of the cytoskeleton is the largest?
What is the primary function of the cytoskeleton in cells?
What is the primary function of the cytoskeleton in cells?
Which of the following is not a function of the cytoskeleton?
Which of the following is not a function of the cytoskeleton?
What component of the cytoskeleton contributes to the movement of cilia and flagella?
What component of the cytoskeleton contributes to the movement of cilia and flagella?
Why is the cytoskeleton important for cellular organization?
Why is the cytoskeleton important for cellular organization?
What unique structural feature distinguishes the nuclear envelope from the cell membrane?
What unique structural feature distinguishes the nuclear envelope from the cell membrane?
Which statement about the nuclear envelope is accurate?
Which statement about the nuclear envelope is accurate?
How many outer lipid bilayers does the nuclear envelope have?
How many outer lipid bilayers does the nuclear envelope have?
What is the primary function of the nuclear envelope?
What is the primary function of the nuclear envelope?
Which of the following correctly describes the relationship between the nucleus and the nuclear envelope?
Which of the following correctly describes the relationship between the nucleus and the nuclear envelope?
What is one method by which substances can move into cells?
What is one method by which substances can move into cells?
Which of the following is least likely to be a mechanism for substance transport across cell membranes?
Which of the following is least likely to be a mechanism for substance transport across cell membranes?
Which process requires energy input to move substances across a cell membrane?
Which process requires energy input to move substances across a cell membrane?
What characterizes facilitated diffusion as a mode of transport?
What characterizes facilitated diffusion as a mode of transport?
Which term best describes the movement of water across a semipermeable membrane?
Which term best describes the movement of water across a semipermeable membrane?
What process occurs inside mitochondria after pyruvate is formed?
What process occurs inside mitochondria after pyruvate is formed?
What is produced in the Krebs cycle that is significant for cellular respiration?
What is produced in the Krebs cycle that is significant for cellular respiration?
Which compound is primarily generated from the Krebs cycle?
Which compound is primarily generated from the Krebs cycle?
What is the primary location of the Krebs cycle within a cell?
What is the primary location of the Krebs cycle within a cell?
Which of the following is NOT a step that occurs before the Krebs cycle?
Which of the following is NOT a step that occurs before the Krebs cycle?
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Study Notes
The Plasma Membrane
- In animal cells, the lipid in the plasma membrane is cholesterol.
- Plasma membrane proteins are embedded in the bilayer or attached to its outer or inner surface.
- It controls the movement of substances in and out of the cell.
The Nuclear Envelope
- The nucleus is enclosed in a nuclear envelope.
- The nuclear envelope is composed of two lipid bilayers pressed against each other.
- The nuclear envelope differs from the cell membrane.
The Cytoskeleton
- The cytoskeleton is composed of different proteins that give cells their shapes, organization, and ability to move.
- Microtubules are the largest cytoskeleton elements.
Cellular Respiration
- The second stage of cellular respiration, the Krebs cycle and some steps before it, take place inside mitochondria.
- NADH and pyruvate are the products of glycolysis.
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