Biology- Cell size + Cell membrane

plasma membrane, homeostasis

Without _________ cells of living things will die because they are unable to maintain ________

phosphate and 2 fatty acids

Phospholipids are a ___________ head and _________ tails.

Hydrophobic

Water fearing

Hydrophillic

water loving

towards each other

Which way do the heads face?

they face each other

Which way do the tails face?

Cholesterol

What do you have to have in the cell membrane in order to stabilize it?

selectively permeable

a property of cell membranes that allows some substances to pass through, while others cannot

CO2, O2
Both nonpolar and small

What 2 molecules can easily pass through the membrane?

Sugar
Both large and polar
Ion+
Ion-
Charged substance

What 3 molecules cannot pass through the membrane?

Has a charge

What does Polar mean?

Diffusion

Movement of molecules from an area of higher concentration to an area of lower concentration.

active transport

Energy-requiring process that moves material across a cell membrane against a concentration difference, low to high

Carrier Proteins and ATP energy

Active transport uses __________

Osmosis

Diffusion of water through a selectively permeable membrane

Aquaporins

Name of protein that lets water pass through

passive transport

Is aquaporins passive or active transport?

membrane proteins

Protiens with carbohydrate chains that can serve as cell recognition markers and can help neighboring cells interact or stick to each other

cytoskeleton filaments

Long protein chains that help the cell hold its shape. Organelles and other large molecules can travel along these chains like super highways in the cell

Phospholipid

Lipids with hydrophobic tails and hydrophillic heads that form two layers in membrane

transport or channel protein

proteins that help carry substances substances across membrane or allow molecules to pass through a channel

Glycolipid

lipids with carbohydrate chains that serve as cell recognition markers

Glycoprotein

Proteins that can send to nearby cells or receive signals from outside their cell. They can also serve as anchors for other proteins inside the cell.