ch. 19 amino acids and protein

Question 1

Immunoglobulin, a protein that stimulates immune responses, would be classified as a __________ protein.

Answer 1

protection

Question 2

The structural formulas of amino acids are the same EXCEPT for the

Answer 2

R group

Question 3

The peptide bonds that combine amino acids in a protein are

Answer 3

amide bonds

Question 4

Which level of protein structure occurs due to the particular sequence of amino acids, which are held together by peptide bonds?

Answer 4

primary structure

Question 5

The interactions that are important in the secondary structure of a protein are

Answer 5

hydrogen bonds

Question 6

In insulin, two peptide chains are held together in a single unit by

Answer 6

disulfide bridges

Question 7

sequence of amino acids

Answer 7

primary structure

Question 8

describes the alpha- helices and beta- sheets that are formed by hydrogen bonding between backbone atoms near each other in polypeptide chain

Answer 8

secondary structure

Question 9

protein folding into 3-D shape stabilized by interactions between side chain R groups of amino acids

Answer 9

tertiary structure

Question 10

result of 2 or more protein subunits assembling to form a larger biologically active protein complex

Answer 10

quaternary structure

Question 11

what structural level of a protein is affected by denaturation

Answer 11

secondary, tertiary, quaternary

Question 12

what level of protein structure is affected by hydrolysis

Answer 12

primary

Question 13

A polypeptide of 50 or more amino acids is called a _____

Answer 13

protein

Question 14

a globular protein that transports oxygen in blood consists of 4 polypeptide chains

Answer 14

hemoglobin

Question 15

hemoglobin carries ______oxygen molecules

Answer 15

4

Question 16

myoglobin carries ____ oxygen molecules

Answer 16

1

Question 17

proteins are denatured above what temp

Answer 17

50 degrees Celsius

Question 18

heavy metal ions such as ______ denature proteins by forming bonds with ionic residues or reacting sulfide bonds

Answer 18

Ag+, Pb2+, Hg2+

Question 19

T/F: Proteins must be denatured before being digested

Answer 19

true

Question 20

ionic attractions between ionized R groups of polar basic and polar acidic amino acids

Answer 20

salt bridges

Question 21

hydrogen bonds form between the CARBONYL oxygen atoms and HYDROGEN atoms in the amide groups bending the polypeptide chian into a sheet

Answer 21

Beta- pleated sheet

Question 22

HYDROGEN bonds form betwwen the oxygen of the carbonyl groups and hydrogen of the N-H groups of the amide bonds in the next turn of the a-helix

Answer 22

a- helix