Cell Membranes: Structure and Function

The process by which cells expel, or secrete, large molecules is known as
1. pinocytosis
2. phagocytosis
3. exocytosis
4. endocytosis
Which answer correctly describes the lipid bilayer?
1. lipids are hydrophobic; phosphates are hydrophilic
2. lipids are hydrophilic; phosphates are hydrophobic
3. lipids are hydrophilic; phosphates are hydrophilic
4. lipids are hydrophobic; phosphates are hydrophobic
In the image depicted above, the part of the bilayer that is hydrophobic includes
1. region A only
2. region B only
3. both region A and region B
4. neither region A nor region B
In the image depicted above, the part of the bilayer labeled "A"
1. are the charged phospates
2. are the hydrophobic lipids
3. are the transport proteins
4. are the glycoproteins
In the image depicted above, the part of the bilayer labeled "B"
1. are the charged phospates
2. are the hydrophobic lipids
3. are the transport proteins
4. are the glycoproteins
Two types are endocytosis are called
1. pinocytosis
2. exocytosis
3. phagocytosis
4. passive transport
In the image above, the transport protein
1. is labeled "A"
2. is labeled "B"
3. is labeled "C"
4. is labeled "D"
In the image above, the phospholipid bilayer
1. is labeled "A"
2. is labeled "B"
3. is labeled "C"
4. is labeled "D"
In the image above, the structures labeled "B", "C" and "D" are all
1. found only in animal cells
2. proteins
3. phospholipids
4. found only in plant cells
The structure whose function is to allow substances to diffuse from an area of higher concentration to an area of lower concentration
1. is labeled "A"
2. is labeled "B"
3. is labeled "C"
4. is labeled "D"
Movement of the small molecules from left to right across the membrane
1. requires passive transport
2. requires no energy
3. requires active transport
4. requires energy
Movement of the small molecules from right to left across the membrane
1. requires passive transport
2. requires no energy
3. requires active transport
4. requires energy
If the small molecules are water molecules, then the movement from right to left across the membrane
1. is called pinocytosis
2. is called osmosis
3. is called active transport
4. will not occur in a healthy cell
When salt is poured on a slug, it dies because
1. water moves out of the slug, causing dehydration
2. salt moves into the slug, poisoning it
3. water moves into the slug, causing it to swell
4. salt moves out of the slug, depriving it of essential minerals
In passive diffusion, substances always move
1. from an area of higher concentration to an area of lower concentration
2. from an area of lower concentration to an area of higher concentration
3. from an area with more of the molecules to an area with fewer of the molecules
4. from an area with fewer of the molecules to an area with more of the molecules