BIOLOGY 1P03 Chapter Notes -Fluid Mosaic Model, Lipid Bilayer, Cell Membrane
Get access
Related Documents
Related Questions
QUESTION 1
Ion diffusion across plasma membrane needs
a concentration gradient across the membrane | ||
specific transporters | ||
ATP | ||
provide extra energy for the transport |
2 points
QUESTION 2
There are four types of large biological molecules
2 points
QUESTION 3
Active transporters transport substances across cell membrane against ____________
2 points
QUESTION 4
Which of the following is a nonpolar amino acid?
1. | Valine | |
2. | Serine | |
3. | Aspartic acid | |
4. | Glutamic acid |
2 points
QUESTION 5
Membrane potential of a cell is created by:
1. | sodium ion concentration difference between inside and outside of the cell | |
2. | a difference in protein concentration across the cell membrane | |
3. | an electrical potential difference between the intracellular fluid and the surrounding extracellular fluid | |
4. | a difference between the potassium concentration inside and outside of the cell |
2 points
QUESTION 6
A mutation resulted in a change from a valine to a glutamic acid in a peptide sequence. This mutation will NOT change the protein folding
True
False
2 points
QUESTION 7
Ions can be transported across plasma membrane by
1. | diffusion | |
2. | No need of transporters | |
3. | osmosis | |
4. | active transport |
2 points
QUESTION 8
Phospholipid is composed of
1. | A glycerol backbone | |
2. | One protein group | |
3. | One carbohydrate group | |
4. | Two fatty acid chains and one phosphate group |
2 points
QUESTION 9
Prokaryotic cells and eukaryotic cells are similar in
1. | Plasma membrane | |
2. | nucleus | |
3. | mechanism for protein translation | |
4. | endoplasmic reticulum |
2 points
QUESTION 10
Disulfide bonds are formed between two histidine residues
True
False
At one time, membrane biologists thought that transport proteins might act by binding a solute molecule or ion on one side of the membrane and then diffusing across the membrane to release the solute molecule on the other side. We now know that this transverse carrier model is almost certainly wrong. Suggest two reasons that argue against such a model. One of your reasons should be based on our current understanding of membrane structure and the other on thermodynamic considerations.
Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Not all terms will be used.
Help Reset exergonic hydrophobic hydrophobic and hydrophilic probable endergonic hydrophilic improbable Integral membrane proteins are embedded stably in the membrane and protrude from one or both sides based on their regions. For a protein to traverse a membrane, movement of its region(s) through the interior of the membrane would be required, which would be highly and hence thermodynamically . |