Peptide Bond

Question 1

its reactions is between amino group of one amino acid and carboxyl group of another amino acid.

Answer 1

Peptide Bond

Question 2

Covalent bonds between amino acids in a peptide are called

Answer 2

peptide bonds (amide).

Question 3

bonds between amino acids in a peptide are called
peptide bonds (amide).

Answer 3

Covalent bonds

Question 4

The structure of peptides is represented beginning with the amino acid whose
amino group is free

Answer 4

(N-terminal end).

Question 5

The other end contains a free carboxyl
group and is the

Answer 5

C-terminal end

Question 6

amino acids are added to a peptide by forming

Answer 6

peptide bonds

Question 7

are added to a peptide by forming peptide bonds

Answer 7

amino acids

Question 8

The peptide linkages are essentially

Answer 8

planar

Question 9

the —– linkages are essentially planar

Answer 9

peptide linkages

Question 10

The planar peptide linkage structure has considerable

Answer 10

rigidity

Question 11

a peptide linkage structure has considerable rigidity

Answer 11

planar peptide linkage

Question 12

3 Many relatively small peptides are biochemically active

Answer 12

• Neurotransmitters
• Hormones
• Antioxidants

Question 13

2 Best-known peptide hormones:

Answer 13

oxytocin and vasopressin

Question 14

Produced by the pituitary gland

Answer 14

Peptide Hormones:

Question 15

Peptide Hormones are produced by the

Answer 15

pituitary gland

Question 16

(nine amino acid residues)

Answer 16

Nona-peptide

Question 17

Nona-peptide (nine amino acid residues) with six of the residues
held in the form of a loop by a

Answer 17

disulfide bond

Question 18

Nona-peptide (nine amino acid residues) with six of the residues held in the form of a loop by a disulfide bond formed between two

Answer 18

cysteine residues

Question 19

Known for its role in social bonding, sexual reproduction,
childbirth, and post-childbirth.

Answer 19

Oxytocin:

Question 20

It has Isoleucine (Ile) at position 3 and Leucine (Leu) at position

Answer 20

Oxytocin:

Question 21

in oxytocin where is the position of the isoleucine

Answer 21

position 3

Question 22

in oxytocin where is the position of the leucine

Answer 22

position 8

Question 23

Involved in water retention in the kidneys and regulation of blood pressure.

Answer 23

Vasopressin:

Question 24

It has Isoleucine (Ile) at position 3 and Leucine (Leu) at position 8

Answer 24

Oxytocin:

Question 25

It has Phenylalanine (Phe) at position 3 and Arginine (Arg) at position 8.

Answer 25

Vasopressin:

Question 26

in Vasopressin, it has phenylalanine at

Answer 26

position 3

Question 27

in Vasopressin, it has arginine at

Answer 27

position 8

Question 28

3 Biochemically Important Small Peptides

Answer 28

Enkephalin Glutathione Aspartame

Question 29

are penta-peptide neurotransmitters produced by the brain and they bind to opioid receptors,

Answer 29

Enkephalin

Question 30

which are involved in pain regulation and reward systems.

Answer 30

Enkephalin

Question 31

Associated with euphoria and addiction.

Answer 31

Enkephalin

Question 32

Enkephalin is associated with

Answer 32

euphoria and addiction

Question 33

Help reduce pain

Answer 33

Enkephalin

Question 34

Best-known enkephalins:

Answer 34

Enkephalin

Question 35

Met-enkephalin:

Answer 35

Tyr–Gly–Gly–Phe–Met

Question 36

Tyr–Gly–Gly–Phe–Met

Answer 36

Met-enkephalin:

Question 37

Leu-enkephalin:

Answer 37

Tyr–Gly–Gly–Phe–Leu

Question 38

Tyr–Gly–Gly–Phe–Leu

Answer 38

Leu-enkephalin:

Question 39

(Glu–Cys–Gly)

Answer 39

Glutathione

Question 40

a tri-peptide – present in high levels in most cells.

Answer 40

Glutathione

Question 41

Regulator of oxidation–reduction reactions.

Answer 41

Glutathione

Question 42

is an antioxidant and protects cellular contents from oxidizing agents such as peroxides and superoxide

Answer 42

Glutathione

Question 43

Glutathione is an antioxidant and protects cellular contents from oxidizing agents such as ---- and ----

Answer 43

peroxides and superoxide

Question 44

Highly reactive forms of oxygen often generated within the cell in response to bacterial invasion

Answer 44

peroxides and superoxide

Question 45

(Asp-Phe)

Answer 45

Aspartame

Question 46

di-peptide that act as artificial sweeteners

Answer 46

Aspartame

Question 47

180x as sweet as sucrose

Answer 47

Aspartame

Question 48

Aspartame is 180x as sweet as

Answer 48

sucrose

Question 49

Glutathione is a regulator of ---------------- reactions

Answer 49

oxidation–reduction reactions.