[Quiz 2]
1. Cohesion of water molecules is due to
- hydrogen bonding between water molecules.
- water molecules adhering to glass.
- polar covalent bonds between hydrogen atoms.
- non-polar covalent bonds between hydrogen and carbon.
2. Which bond takes the most energy to break?
- Van der Waals interaction
- Hydrogen bond
- Covalent bond
- Ionic bond
3. Which statement about diffusion is false?
- Diffusion does not require an input of energy
- Diffusion results in a net movement of molecules from high to low concentrations
- Diffusion is an example of passive transport
- All types of molecules are able to diffuse across the plasma membrane
4. Which statement about facilitated diffusion is false?
- Only hydrophobic molecules can be transported across the membrane via facilitated diffusion.
- Molecules move through a membrane protein channel or carrier.
- It does not require an input of energy.
- It results from a random motion of molecules.
5. Which of the following is an example of primary active transport?
- A small hydrophobic molecule diffuses across the lipid bilayer.
- Water moves down its concentration gradient through aquaporins.
- ATP directly transfers energy to the Na+/K+ pump to transport ions across the membrane.
- Glucose enters a cell using facilitated diffusion.
6. The Na+ K+ ATPase
- provides for facilitated diffusion
- requires an existing Na+ gradient to function
- is a primary active transporter
- is a symporter
7. Which of the following is false regarding the Na+/K+ ATPase?
- It causes Na+ ion concentration to be high inside the cell
- K+ ions are pumped against their concentration gradient
- It is an antiporter
- It causes an electrochemical gradient to be formed across the membrane
8. Whenever there is significant movement of water across a biological membrane, what process is occurring?
- Primary active transport
- Secondary active transport
- Simple diffusion directly across the membrane
- Facilitated diffusion through aquaporins
9. What is the difference between a fatty acid and a phospholipid?
- Only phospholipids have hydrophilic head groups
- Phospholipids have much large hydrophilic head groups
- Fatty acids are composed of phospholipids
- Fatty acid have a modified glycerol as part of their structure
10. As temperature increases, how does cholesterol affect the plasma membrane?
- It increases membrane fluidity
- It decreases the phospholipid head groups from interacting with water.
- It binds specifically to the phospholipid head
- It increases the stability of the membrane
11. This amino acid has what type of R group?
- amino
- Carboxyl
- non-polar
- polar
- charged
12. What type of interaction is responsible for the formation of secondary structure of proteins?
- Hydrogen bonds between R groups of amino acids
- Hydrogen bonds between two polypeptide chains
- Hydrogen bonds between adjacent amino acid
- Hydrogen bonds between portions of the polypeptide backbone
13. Which functional group is not found in proteins?
- Carbonyl
- Phosphate
- Carboxyl
- Amino
14. Which is most likely true of the following amino acid?
- It would be located in the interior of a globular protein
- It would be located on the exterior of a globular protein
- It would form hydrogen bonds in water
- It would be found lining the channel of a transmembrane protein
15. Which of the following carbons is involved in a peptide bond?
- 2
- 4
- 1
- 3
16. This amino acid has what type of R group?
- charged
- polar
- non-polar
- carboxyl
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