Ch. 11 Lesson 3 Moving Cellular Material
Yes
Is a cell membrane semipermeable?
Carrier & channel proteins
Name the two types of transport proteins.
passive transport
Small molecules, such as oxygen & carbon dioxide are examples of active OR passive transport?
exocytosis
Some substances are too large to leave a cell by diffusion or by using a transport protein, but they can leave a cell by a process called _________.
True
T/F Active transport is most often used to bring needed nutrients into a cell.
True
T/F Diffusion & osmosis does not require a cell to use energy.
False Some substances are too large to enter a cell membrane by diffusion or by using transport protein. These substances can enter a cell by endocytosis.
T/F No matter what their sizes, substances are able to leave a cell by diffusion or by using a transport protein.
True
T/F Proteins are removed from a cell through exocytosis.
True
T/F Some cells take in bacteria and viruses using endocytosis.
False Some molecules & waste materials leave cells by active transport.
T/F Some molecules and waste materials leave cells by passive transport.
True
T/F Some substances are too large to enter a cell membrane by diffusion or by using a transport protein.
False It is important!!
T/F The movement of nutrients, waste materials, and other substances into and out of a cell is not important for survival.
True
T/F The volume of a cell increases faster than its surface area.
False Facilitated diffusion does not require a cell to use energy.
T/F Facilitated diffusion requires a cell to use energy
volume
The _________is the amount of space inside the cell.
surface area
The area of the cell membrane is the cell's ________ ________.
equilibrium
Usually, diffusion continues through a membrane until the concentration of a substance is the same on both sides of the membrane. When this happens, a substance is in what?
cell size
What is limited by a cell's surface-area-to-volume ratio?
3/1 or 3:1 Remember: SA=length X width X 6 V=length X width X height SA/volume
What is the surface-area-to-volume ratio of a cell whose six sides are 2mm long?
Small molecules
What size molecules can pass through a membrane by a process called passive transport?
facilitated diffusion
When molecules pass through a cell membrane using special proteins called transport proteins, this is _________________.
b. exocytosis
Which process eliminates substances from cells in vesicles? a. endocytosis b. exocytosis c. osmosis d. photosynthesis
Active transport
Which type of movement through a cell membrane requires the cell to use energy?
Carrier proteins
Which type of transport proteins carry large molecules, such as glucose, through the cell membrane?
Channel proteins
Which type of transport proteins form pores through the membrane?
Facilitated diffusion moves substances through a cell membrane without using the cell's energy.
Why is facilitated diffusion a type of passive transport?
semipermeable
___________ is when certain substances are allowed to enter or leave a cell
Cell membrane
controls the movement of substances into and out of cells
osmosis
the diffusion of water molecules only through a membrane
passive transport
the movement of substance through a cell membrane without using the cell's energy
diffusion
the movement of substances from an area of higher concentration to an area of lower concentration
active transport
the movement of substances from areas of lower concentration to areas of higher concentration
endocytosis
the process during which a cell takes in a substance by surrounding it with the cell membrane
exocytosis
the process during which a cell's vesicles release their contents outside the cell
