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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
a cell membrane is _______, which means that it allows only certain substances to enter or leave a cell	semipermeable
Passive transport is the movement of substances through a cell membrane without using the cell's _______.	energy
Diffusion is the movement of substances from an area of _______ concentration to an area of ______ concentration.	Higher,lower
Usually diffusion continues through a membrane until the _______ of a substance is the same on both sides of the membrane.	concetration
Osmosis is diffusion of ______ molecules only through a membrane.	water
if the concentration of water in the air surrounding a plant is less than the concentration of water inside the plant's vacuoles, water will diffuse into the ______ until concentrations of water are equal.	air
Facilitated diffusion allows molecules to pass through a cell membrane using ______ proteins	transport
Carrier proteins carry _________ through the cell membrane.	molecules
Active transport uses the cell's _______ to move substances through a cell membrane	energy
Active transport moves substances from areas of _______ concentration to areas of _________ concentration.	lower, higher
a cell uses __________ to take in substances by surrounding it with the cell membrane.	endocytosis
a cell's vesicles release their contents outside the cell during ________.	exocytosis
for a cell to survive, it's surface area must be compared to its ________.	volume
as a cell ________, its volume increases faster than its surface area.	grows
_______ proteins allow ions to pass through the cell membrane.	Channel