Be able to explain the mechanisms of stomatal opening AND closing including changes in relevant solutes inside the cell, where those solutes come from and where they go, the role of all transporters involved and the H+ and electrical gradients across the cell membrane.
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Cellular biology answer check. please check if my answers arecorrect or not.
1) The concentration of ions inside a cell is the same as theirconcentration outside of the cell. True or false? (i chose falsesince having equilibrium inside a cell is bad)
2) Membrane transport proteins...
a)...transport membrane potentials between cells |
b) | ...transport membranes from the ER to the Golgi |
c) | ...are made up of phospholipids |
d) | ...transport molecules across membranes |
i chose d
3)The electrochemical gradienttakes into account:
a) | The concentration of solutes on either side of themembrane. |
b) | The overall charge on either side of the membrane. |
c) | Both of these. |
i chose C. (although i am sure that overall charge matters, Iwasn't sure if concentration of solutes are taken account.)
4) If no energywere expended by an animal cell:
a) | Both gradients would be depleted |
b)The K+ gradient would maintain itself. |
c) | None of these |
d) | The Na+ gradient would maintain itself. |
I chose d) mainly because I think Na+ gradient exist in animalcell and not K+ gradient.
5) Which of the following is a true statement aboutactin?
a) | Once actin has polymerized, it never depolymerizes. |
b) | Actin is a transmembrane protein. |
c) | Actin can form branched networks. |
d) | Actin filaments are organized into hollow tubes. |
I chose c. can't explain why.
6)Ion channels:
a) | Form a hydrophobic channel through the membrane |
b) | Have filters that let sugars through |
c) | Are selective for particular ions (only the |
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