CC Inside the Cell Membrane (Amoeba Sisters) CC Cooper

What is Osmosis?

• Movement of solutes across a selectively permeable membrane.

• Movement of water across a selectively permeable membrane.

What does it mean to say  that the plasma membrane is "semi-permeable"?

• It lets out some substances and lets in all other subtances

• It allows some substances to enter and leave the cell, but not others

• it allows all thing out of the cell

• it allows all things into the cell

Why are cells small?

• It allows them to have a larger ratio of surface area to volume, so they can more quickly move things they need in and things they don't out.

• It allows them to have a bigger volume than surface area, so they can more quickly move things they need in and things they don't out.

Do bacteria have a cell membrane?

• No

• Yes

The current model of the cell membrane is called the ___________________.

• there is no current model.

• fluid mosaic model.

The components of the cell membrane are static.

• Yes, they remain still.

• No, they are in motion.

Lipids are _________.

• nonpolar

• polar

The head of a phospholipid is _________ and the tail is __________.

• polar, nonpolar

• nonpolar, polar

Polar molecules are __________ and nonpolar molecules are _________.

• hydrophilic; hydrophobic

• hydrophobic; hydrophilic

Is the cell membrane flexible?

• No

• Yes