c190 the cell membrane

If a cell is able to maintain homeostasis, it can maintain the balance of conditions inside the cell for normal function. 

• it can maintain the balance of conditions inside the cell for normal function. 

• it cant maintain homeosatis

• it thrives to provide energy

• it begins to cry when laughed at

The cell membrane determines what enters and exits the cell, and it is how the cell interacts with its environment

t. As you have already learned, the cell membrane is a phospholipid bilayer structure that provides a __________ barrier between the inside and the outside of the cell. But the cell does not want to stop movement across the membrane

molecules spontaneously move from areas of high concentration to areas of low concentration due to random movement

The concentrated drop of color slowly ______ until the water in the beaker appears to have a uniform color. 

When things move from a ​ (a)   concentration to a ​ (b)   concentration, they are moving ​ (c)   or with their ​ (d)   gradient. ​

• high
• low
• down
• concentration

A cell has large amounts of carbon dioxide that have accumulated inside as waste. What will happen to those carbon dioxide molecules?

• They will diffuse out of the cell down their concentration gradient.

• They will remain inside of the cell but become less concentrated.

• They will remain inside the cell and continue to build up to higher and higher concentrations.

• They will move out of the cell against their concentration gradient.

Why would the cell need the carbon dioxide to diffuse out?

• The cell would prefer to keep the carbon dioxide but cannot stop it from diffusing.

• The cell does not need the carbon dioxide; it is a waste product.

• The cell is able to increase the membrane’s permeability by having more molecules diffuse through it.

Molecules can spread ​ (a)   or​ (b)   of a cell, following their ​ (c)   tendency to spread ​ (d)   , moving ​ (e)   their concentration gradient.

• in
• out
• natural
• down

Which kinds of molecules passes freely through the cell membrane? (Read each option carefully and select all that apply.)

• Small molecules

• nonpolar molecules

• polar molecules

• Polar molecules

• Nonpolar molecules