The following shows the dipeptide alanine-serine. Four atoms are labeled. Which
ID: 48377 • Letter: T
Question
The following shows the dipeptide alanine-serine. Four atoms are labeled. Which atom is part of the peptide bond that joins the two amino acids?
Atom A
Atom B
Atom C
Atom D
Question 6
Select one answer.
10 points
Which of the following is the correct result after adding the amino acid serine to a dipeptide made of two alanine residues?
Question 7
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10 points
The peptide bond that forms between two amino acids is an example of a(n):
ionic bond
hydrogen bond
covalent bond
Question 8
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10 points
Which of the following curves best represents the activity of an enzyme isolated from a bacteria that lives in the hot springs in Yellowstone (water temperature 120 degrees C)?
curve A
curve B
curve C
Question 9
Select one answer.
10 points
Which of the following plots more correctly shows the activity of pepsin as a function of pH?
plot A
plot B
plot C
plot D
Question 10
Select one answer.
10 points
Two enzymes catalyze the same reaction. Enzyme A converts substrate to product twice as fast as enzyme B. Which enzyme has the lower activation energy or energy barrier: A or B?
Enzyme A
Enzyme B
Explanation / Answer
5. Atom B. because peptide bond occurs between C=N of CO and NH respectively
6. A or B
7. Hydrogen bond
8. B, because it would best work at 120 degree
9. A, because pepsin works in the range pH 2 to pH 6.5
10. enzyme A has lower activation energy than B.