8. Which of the following amino acids has negatively charged side chain under ne

Question

8. Which of the following amino acids has negatively charged side chain under neutral pH?
a.) P b.) W c.) E d.) A e.) M

9. Which of the following amino acids has positively charged side chain under neutral pH?
a.) P b.) K c.)E d.) A e.) M

10. Which of the following amino acids has polar side chain?
a.) F b) W c) V d) T e) I


11. Which of the following amino acids has hydrophobic side chain?
a) D b)W c)R d) T e) S

12. Which of the following amino acids can form disulfide bond?
a) D b)W c) R d)C e)S

13. Which of the following amino acids tend to kink alpha helix?
a) P b)W c)R d)C e)S

14. Which of the following is not a feature commonly observed in Beta sheets?
a) antiparallel regions b)coiled-coil patterns c)extended polypeptide backbone d)parallel regions

15. ?G° indicates indicates the change in the standard free energy as a reactant is converted to product. Given what you know about these values, which reaction below is the least favorable?
a) ADP+Pi? ATP ?G°= +7.3 kcal/mole
b) glucose 1-phosphate ? glucose 6-phosphate ?G°= -1.7 kcal/mole
c) glucose + fructose ? sucrose ?G°= +5.5 kcal/mole
d) glucose ? CO2+H20 ?G°= -686 kcal/mole

16. Indicate which of the following statements is true
a) Lipid linked proteins are classified as peripheral membrane proteins because the polypeptide chain does not pass through the bilayer.
b) A protein can be embedded on the cytosolic side of the membrane bilayer by employing a hydrophilic alpha helix.
c) A protein that relies on protein-protein interactions to stabilize its membrane association is classified as a peripheral membrane protein because it can be dissociated without the use of detergents.
d) Membrane proteins that pump ions in and out of the cell are called flippase.

Explanation / Answer

8) c.) "E" / Glutamate 9) b.) "K" / Lysine 10) d.) "T" / Threonine 11) b.) "W" / Tryptophan 12) d.) "C" / Cysteine 13) a.) "P" / Proline 14) b.) coiled-coil patterns 15) a.) ADP+Pi --> ATP is unfavorable. 16) a.) I'm confident about all of these answers.

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