Online Homework 8 – Proteins-BIOL-107
Online Homework 8 – Proteins
Question 1
What two functional groups do all amino acids have?
phosphate
hydroxyl
amino
ketone
carboxyl
Question 2
How many different amino acids are used by cells to produce polypeptides?
5
150
24
20
Question 3
Identify the R group of this amino acid:
-COOH
-H
-CH3
-NH2
Question 4
The sequence of amino acids in the polypeptide chain is referred to as the _________________ structure.
primary
tertiary
tertiary
quaternary
secondary
Question 5
What kind of secondary structure is pictured below?
Paul RHJ Timmers, CC BY 4.0 <https://creativecommons.org/licenses/by/4.0>, via Wikimedia Commons
alpha helix
beta-pleated sheet
beta-pleated sheet
Question 6
The 3D globular structure that results from the interaction of the R groups is called the _______________ structure.
primary
tertiary
tertiary
quaternary
secondary
Question 7
If two polar amino acids come close together in the tertiary structure, what kind of bond would they likely make?
disulfide bond
hydrogen bond
hydrophobic interaction
ionic bond
Question 8
With which amino acids would the basic amino acids arginine and lysine like to interact?
methionine
aspartic acid
arginine
histidine
glutamic acid
Question 9
When proteins lose their 3-D shape, the process is called _________
renaturing
phosphorylation
denaturing
dephosphorylation
Question 10
_________ cause the shape of proteins to change, thus inactivating them.
cold temperature
heat
heat
pH that is not optimal
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