UNE PHSL 1010 - Week 2 Lecture Notes Test With
Complete Solutions
What constitutes lipid rafts? - ANSWER Clusters of similar molecules (phospholipid
heads w/ PLAP, aka phospholipid apoproteins)
What part gives a cell membrane it's fluidity? - ANSWER Cholesterol
Is the phospholipid head polar or nonpolar? - ANSWER Polar
Which part of the phospholipid is nonpolar? - ANSWER Lipid tail
What is the phospholipid head composed of? - ANSWER Serine (or perhaps another
chemical i.e. choline), phosphate group and glycerol
What three kinds of transport proteins are there? ANSWER Carriers
Channel
Pumps
What are the different ways of passive transport? ANSWER Simple diffusion
Facilitated diffusion channels, carriers; protein mediated
Osmosis
What kind of proteins are involved in facilitated diffusion? ANSWER Channel
Carrier
Gap junction proteins between cells
, What are the different active transports? ANSWER Primary
Secondary
Vesicular transport
What determines the rate of simple diffusion? HINT Fick's law - ANSWER -Ficks law =
Rate of diffusion = avail surface area + conc. gradient/ resistance of membrane +
thickness of membrane
- Other factors considered with the rate of diffusion include solubility, composition of the
lipid layer, and molecular size. These in turn will influence the factors outlined in Fick's
law defined above.
What types of gates can exist on a protein channel? - answer -Voltage gated
-Ligand gated
-Mechanically gated
-Temperature gated
-Light sensitive
Give two examples of open channel proteins. - answer -Water channels
-Leak channels
What type of proteins generally change shape to move materials across the plasma
membrane? - answer Carrier proteins
Give some examples of carrier proteins - answer GLUT
-SGLT (Sodium-Glucose)
T/F? Molecules moving against their concentration gradient can diffuse passively into
Complete Solutions
What constitutes lipid rafts? - ANSWER Clusters of similar molecules (phospholipid
heads w/ PLAP, aka phospholipid apoproteins)
What part gives a cell membrane it's fluidity? - ANSWER Cholesterol
Is the phospholipid head polar or nonpolar? - ANSWER Polar
Which part of the phospholipid is nonpolar? - ANSWER Lipid tail
What is the phospholipid head composed of? - ANSWER Serine (or perhaps another
chemical i.e. choline), phosphate group and glycerol
What three kinds of transport proteins are there? ANSWER Carriers
Channel
Pumps
What are the different ways of passive transport? ANSWER Simple diffusion
Facilitated diffusion channels, carriers; protein mediated
Osmosis
What kind of proteins are involved in facilitated diffusion? ANSWER Channel
Carrier
Gap junction proteins between cells
, What are the different active transports? ANSWER Primary
Secondary
Vesicular transport
What determines the rate of simple diffusion? HINT Fick's law - ANSWER -Ficks law =
Rate of diffusion = avail surface area + conc. gradient/ resistance of membrane +
thickness of membrane
- Other factors considered with the rate of diffusion include solubility, composition of the
lipid layer, and molecular size. These in turn will influence the factors outlined in Fick's
law defined above.
What types of gates can exist on a protein channel? - answer -Voltage gated
-Ligand gated
-Mechanically gated
-Temperature gated
-Light sensitive
Give two examples of open channel proteins. - answer -Water channels
-Leak channels
What type of proteins generally change shape to move materials across the plasma
membrane? - answer Carrier proteins
Give some examples of carrier proteins - answer GLUT
-SGLT (Sodium-Glucose)
T/F? Molecules moving against their concentration gradient can diffuse passively into
