B2.1 Membranes and Transport Flashcard

Front

Membrane proteins that span the entire lipid bilayer are called __________.

Back

Transmembrane proteins

Front

What does the term 'hydrophilic' mean when it is translated literally?

Back

Water loving

Front

Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are __________.

Back

Hypotonic to fresh water but hypertonic to the salt solution

Front

In a lipid bilayer, _________ tails point inward and form a region that excludes water.

Back

Hydrophobic

Front

According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly __________.

Back

Embedded in a lipid bilayer

Front

What is the primary function of the cell membrane?

Back

To protect the cell and regulate what enters and exits.

Front

Define 'osmosis'.

Back

The diffusion of water across a selectively permeable membrane.

Front

What is a hypertonic solution?

Back

A solution with a higher concentration of solutes compared to another solution.

Front

What is a hypotonic solution?

Back

A solution with a lower concentration of solutes compared to another solution.

Front

What does 'isotonic' mean?

Back

Two solutions having the same osmotic pressure.