Review: Cell membrane and transport
The cell membrane is a vital structure that controls what enters and exits the cell, maintaining homeostasis. Understanding its transport mechanisms is essential for studying cellular functions.
Quiz(11 domande)
1. What process requires energy to move substances across the membrane?
Termini in questo set(19)
What is the cell membrane?
A flexible barrier that surrounds the cell, controlling the movement of substances.
Function of the cell membrane?
Regulates what enters and exits the cell, maintaining internal balance.
True or false: The cell membrane is impermeable.
False, because it is selectively permeable, allowing certain substances to pass.
What are phospholipids?
Molecules that make up the cell membrane, with hydrophilic heads and hydrophobic tails.
Difference between passive and active transport?
Passive transport does not require energy, while active transport does.
What is diffusion?
The movement of molecules from an area of higher concentration to an area of lower concentration.
Fill in the blank: Osmosis is the diffusion of ___ across a semipermeable membrane.
water
True or false: Active transport moves substances with the concentration gradient.
False, because it moves substances against the concentration gradient.
What is facilitated diffusion?
The process of transporting substances across a membrane with the help of proteins.
What are channel proteins?
Proteins that create passages in the membrane for specific ions and molecules.
Role of cholesterol in the cell membrane?
Maintains membrane fluidity and stability, preventing it from becoming too rigid.
What is exocytosis?
The process of expelling materials from the cell via vesicles.
Which type of transport requires energy?
Active transport requires energy to move substances against their concentration gradient.
True or false: All cells have a rigid cell wall.
False, because only plant cells have a rigid cell wall; animal cells do not.
What is endocytosis?
The process of engulfing substances into the cell via vesicles.
Difference between pinocytosis and phagocytosis?
Pinocytosis is the uptake of liquids, while phagocytosis is the uptake of solids.
What is a concentration gradient?
A difference in the concentration of a substance across a space.
What is a semipermeable membrane?
A membrane that allows certain molecules to pass while blocking others.
Quiz question: Function of proteins in cell membranes?
Transport, communication, and structural support.
Domande in questo set(11)
1. What process requires energy to move substances across the membrane?
2. Which statement about the cell membrane is NOT true?
3. What is the primary role of cholesterol in the membrane?
4. Which type of transport does not require energy?
5. Osmosis refers specifically to the movement of what?
6. The process of engulfing large particles is called what?
7. Which of the following describes passive transport?
8. Which of the following is a characteristic of channel proteins?
9. Fill in the blank: The movement of molecules from high to low concentration is called ___.
10. Which of the following best describes a semipermeable membrane?
11. True or false: Endocytosis requires energy.
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