Assignment Quesitons Flashcards Preview

Biochemistry I > Assignment Quesitons > Flashcards

Flashcards in Assignment Quesitons Deck (19)
Loading flashcards...
1

When are H bonds the strongest?

When they are in a straight line.

2

Which amino acids contain sulfur?

Methionine and cysteine.

3

Which amino acid does not have an amino group?

Proline.

4

At a high pH in an amino acid titration curve...

Everything is deprotonated, negative charge.

5

How is a titratable R group represented on a titration curve?

3 buffering regions.

6

How is protein conformation determined?

Putting hydrophobic AA residues on the inside.

7

H bonds are what to the axis of the helix?

Roughly parallel.

8

Why are antiparallel beta sheets more stable than parallel?

Because parallel have weaker H bonds laterally between adjacent strands.

9

Which amino acids are found in the middle of beta turns?

Pro and Gly.

10

Protomer

Repeating structural unit in a protein.

11

Interactions between residues on separate polypeptide chains =

Quaternary structure.

12

Ammonium sulfate is most effective for...

Selective precipitation.

13

What is negligible at the beginning of a reaction with an enzyme?

Changes in substrate concentration.

14

Enzymes bind the transition state better than...

The reaction product.

15

Biological fatty acids are all...

Ester of single fatty acids with long chain OH's.

16

What is not found in bacterial membranes?

Sterols.

17

Cellulose is a...

Homopolysaccharide

18

Lower pI =

More negative at a given pH.

19

Higher pI =

More positive at a given pH.