bio Flashcards
(21 cards)
What is passive transport?
The movement of substances across a cell membrane without the use of energy.
True or False: Osmosis is a type of passive transport.
True
Fill in the blank: Diffusion is the movement of particles from an area of _____ concentration to an area of _____ concentration.
high; low
What is the primary difference between endocytosis and exocytosis?
Endocytosis is the process of taking substances into the cell, while exocytosis is the process of expelling substances from the cell.
Multiple choice: Which of the following is a type of endocytosis? A) Pinocytosis B) Osmosis C) Diffusion D) Exocytosis
A) Pinocytosis
True or False: Phagocytosis is a form of endocytosis that involves the uptake of large particles.
True
What is the role of the cell membrane in passive transport?
The cell membrane selectively allows certain substances to pass through while blocking others.
Fill in the blank: In osmosis, water moves through a _____ membrane.
semipermeable
Multiple choice: Which process involves the engulfing of solids by a cell? A) Pinocytosis B) Phagocytosis C) Diffusion D) Osmosis
B) Phagocytosis
What type of molecules typically move across the cell membrane via diffusion?
Small, nonpolar molecules such as oxygen and carbon dioxide.
What is facilitated diffusion?
Facilitated diffusion is a process of passive transport that allows substances to cross membranes with the assistance of special proteins.
True or False: Facilitated diffusion requires energy input from the cell.
False
Fill in the blank: __________ are proteins that help transport substances across a cell membrane during facilitated diffusion.
Protein carriers
What role do protein channels play in facilitated diffusion?
Protein channels provide a passageway for specific ions and molecules to move across the cell membrane.
Multiple Choice: Which of the following is NOT a characteristic of facilitated diffusion? A) It requires specific proteins, B) It moves substances against their concentration gradient, C) It is a passive process.
B) It moves substances against their concentration gradient.
What is active transport?
Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.
True or False: Active transport does not require energy.
False
Fill in the blank: Active transport relies on ______ to move substances against their concentration gradient.
energy
What role do protein pumps play in active transport?
Protein pumps are integral membrane proteins that use energy to transport ions or molecules across the membrane against their concentration gradient.
Multiple Choice: Which of the following is a characteristic of active transport? A) Movement with the concentration gradient B) Requires ATP C) Passive diffusion D) None of the above
B) Requires ATP
