Question

11.) C6H12O6 + 6O2 + ADP + Pi---> 6CO2 + 6H2O + ATP Which of the following describe this reaction?

a. it is exergonic

b. entropy in this reaction increases

c. the energy in only contained in ATP

d. A and B

e. A and C

12.) For a protein to be an integral membrane protein, it would have to be _____.

a. hydrophilic

b. hydrophobic

c. amphipathic

d. completely covered with phospholipids

e. exposed on only one surface of the membrane

13.) How does DNA store information?

a. nucleotide pairing provides information on how to copy DNA

b. the nucleotides of DNA code for the RNA in cells

c. The nucleotides of DNA code for the more complex amino acid sequence of the proteins in cells

d. B and C

e. A, B, and C

14.) How might a cell compensate for excessive membrane fluidity that occurs when exposed to elevated temperature?

a.  Reduce membrane cholesterol content.

b.  Alter the lipid composition to have longer fatty acyl tails and fewer double bonds.

c.  Alter the lipid composition to have shorter fatty acyl tails and more double bonds.

d.  Alter the lipid composition to have shorter and more unsaturated fatty acyl tails.

15.) How would a cell transport a medium-sized molecule from a low concentration to a high concentration?

a. facilitated diffusion through an ion channel protein

b. facilitated diffusion through a transporter protein

c. active transport through a “pump” protein

d. passive transport

Answer 1

11. the given reaction represents cellular respiration and it is an exergonic process. This means that in this process, organic molecules are catabolised to produce energy in the form of ATP. Also as energy is being released, the entropy increases. so the correct option is D. During cellular respiration, some of the energy released are lost in the form of heat, not all energy is converted to ATP.

12. integral membrane protein should have to be amphipathic (having both hydrophobic and hydrophilic parts) this enables the protein molecules to be able to insert themselves into the lipid bilayer and also to interact with the aqueous part of the cell.

13. the nucleotide sequence in a DNA stores the information which is being copied as RNA through transcription process this RNA is the converted to protein (complex Amino acid sequence) by translation process. So the correct optionis E

14. lipids with long fatty acid chain and fewer double bonds will have higher melting point so this will compensate for the excessive membrane fuidity. (unasturated chains cannot pack as densely as saturated chains, so they have lower melting point)...(cholesterol stabilises membrane fluidity, at high temperature, cholesterol prevents membrane from melting while at low temp. it prevents the membrane from stiffening.)

15. cell transport from lower concentration to higher concentration (against concentration gradient) requires energy so the transport process is Active transport through a pump protein.

the other mode of transmembrane transport listed occurs along concentration gradient of molecules and no energy is required for the transport.