Phospholipid by layer

Which part of a phospholipid is hydrophobic

• Phosphate head

• Both head and tail

• Fatty acid tail

• Neither

Plasma membrane is described as

• Rigid and imobile

• A fluid mosaic madel

• Chernenoi of theme

• suspicless memen

which part of the phospholipid faces the watery inside and outside the cell

• Fatty acid tails

• Hydrophilic heads

• cholesterol

• integral proteins

Which statement best explains why water needs aquaporins to cross the membrane efficiently?

• Water is hydrophobic snd dissolves in the lipid tails

• water is small but polar, so it moves slowly through the bilayer without channels

• Water is too large to pass even with channels

• Water only moves by active transport

which membrane structure helps stabilize fluidity at different temperatures

• Glycoprotein

• Cholesterol

• Aquaporins

• Peripheral protein

Why is the bilayer arranged with head facing outward and tails facing in

• To allow the tails to interact with water more easily.
• To facilitate the movement of proteins within the bilayer.
• to protect the hydrophobic tails from water.

• To create a rigid structure for the cell membrane.

Whats the role of aquaporins in osmosis

• Aquaporins block water movement during osmosis.
• Aquaporins are responsible for nutrient absorption.
• Aquaporins convert water into energy.
• Aquaporins facilitate the transport of water during osmosis.

How does wattle move through aquaporins differently than trying to cross the lipid bilayer directly

• Wattle cannot pass through aquaporins at all.
• Wattle moves through aquaporins more efficiently than crossing the lipid bilayer directly.
• Wattle moves slower through aquaporins than the lipid bilayer.
• Wattle requires energy to move through aquaporins unlike the lipid bilayer.

how would O2 cross the membrane

• O2 crosses the membrane through active transport.
• O2 requires a protein channel to cross the membrane.
• O2 is absorbed by endocytosis to cross the membrane.
• O2 crosses the membrane by simple diffusion.

How would sodium ions cross the mebrane

• Sodium ions are transported by glucose molecules.
• Sodium ions passively diffuse through the lipid bilayer.
• Sodium ions cross the membrane through ion channels and active transport mechanisms.
• Sodium ions are absorbed through endocytosis.