Proteins

Question 1

How much (percent) does protein account for of the dry mass of most cells

Answer 1

50 percent

Question 2

T/F: A protein consists of three polypeptides

Answer 2

False; they consist of one or more polypeptides

Question 3

What are polypeptides

Answer 3

Polymers built from the same set 20 amino acid monomers

Question 4

What are amino acids

Answer 4

Organic molecules with carboxyl and amino functional groups

Question 5

How do amino acids differ in their properties

Answer 5

Differing chains called R-groups

Question 6

What links amino acids

Answer 6

Peptide bonds

Question 7

What is a polypeptide

Answer 7

A polymer of amino acids

Question 8

What determines a protein’s structure

Answer 8

Its function

Question 9

What are enzymes

Answer 9

A type of protein that acts as a catalyst to speed up chemical reactions

Question 10

What are the four levels of protein structure

Answer 10

• Primary
• Secondary
• Tertiary
• Quaternary

Question 11

Explain primary structure

Answer 11

A proteins unique sequence of amino acids

Question 12

Explain secondary structure

Answer 12

Found in most proteins Consists of coils and folds in the polypeptide chain

Question 13

Explain tertiary structure

Answer 13

Determined by interactions among various side chains

Question 14

Explain quaternary structure

Answer 14

Results when a protein consists of multiple polypeptide chains

Question 15

What is secondary structure also called

Answer 15

Alpha helix

Question 16

What is a FOLDED secondary structure called

Answer 16

Beta plated sheet

Question 17

What causes a fold in a secondary structure

Answer 17

Hydrogen bonds

Question 18

What can affect a proteins structure

Answer 18

• pH
• Salt Concentration
• Temperature
• Environmental factors

Question 19

What is the loss of a proteins structure called

Answer 19

Denaturing

Question 20

What helps/ assists a proteins molecules folding

Answer 20

Chaperonins