Proteins

Question 1

Main component of protoplasm

Answer 1

Proteins

Question 2

In animals, this is more important to life than carbohydrates

Answer 2

Proteins

Question 3

(9) Essential Amino Acids

Answer 3

H, I, L, K
M, T, W, F
V

histidine, isoleucine lysine, leucine, methionine, threonine, tryptophan, phenylalanine, and valine

Question 4

(2) Conditional Amino Acids; needed by infants

Answer 4

H, R

Histidine, Arginine

Question 5

(11) Non-essential Amino Acids

Answer 5

A, R, N, D
E, G, Q
P, S, Y, C

alanine, arginine, asparagine, aspartic acid, glutamic acid, glycine, glutamine, proline, serine, tyrosine, and cysteine.

Question 6

What happens to a red litmus paper when Casein is heated?

Answer 6

Red turns to blue when in contact with its fumes

Question 7

What reaction will you get with Lead and Sulfur

Answer 7

Black precipitation

Question 8

Elements found in Proteins

Answer 8

C, H, O, N, usually S, and sometimes P

Question 9

The alteration of conformation of proteins thereby decreasing their solubility in water

Answer 9

Denaturation

Question 10

The only 2 body fluids that does not contain proteins

Answer 10

Normal urine & Bile

Question 11

A group of nitrogenous substances

Answer 11

Proteins

Question 12

How many percent does the body consist of Proteins

Answer 12

About 19%; muscle, tissue, skin, hair, and nails are rich in this

Question 13

The type of linkage that Protein have

Answer 13

Peptide linkage

Question 14

Building blocks of Proteins

Answer 14

Amino acid

Question 15

The two groups that Amino Acids have

Answer 15

Amine Group (NH2) & Carboxylic acid Group (-COOH)

Question 16

A test for proteins or substances that contain peptide linkage

Answer 16

Biuret Test

Question 17

Reagent and positive result for Biuret Test

Answer 17

Reagent: NaOH + dilute CuSO4
+ result: violet color

Question 18

Test used to distinguish the presence of benzene ring

Answer 18

Xanthoproteic Test

Question 19

Reagent and positive result for Xanthoproteic Test

Answer 19

Reagent: conc. HNO3 (Nitric Acid)
+ result: dark yellow color (Thr, Trp, Phe)

Question 20

CH2 - CH - COOH
| |
🔷 NH2

Answer 20

F, Phe

Question 21

HO - 🔷 - CH2 - CH - COOH
|
NH2

Answer 21

Y, Tyr

Question 22

🔷 - CH2 - CH - COOH
\ | |
N NH2
|
H

Answer 22

W, Trp

Question 23

Test for Tyrosine (Y)or presence of phenolic OH

Answer 23

Million’s Test

Question 24

Reagent and positive result for Million’s

Answer 24

Reagent: Mercuric Nitrate + Mercuric Nitric
+ result: flesh/red ppt.

Question 25

Test for Tryptophan (W)

Answer 25

Hopikins’-Cole Test

Question 26

Reagent and positive result in Hopkins’-Cole Test

Answer 26

Reagent: Glyoxylic acid + cons. H2SO4
+ result: violet ring

Question 27

Test for Sulfur

Answer 27

Reduced-Sulfur Test

Question 28

Reagent and positive result for Reduced-Sulfur Test

Answer 28

Reagent: KOH + Pb(CH3 - COO)2 sol.
+ result: black color (Cys, Met)

Question 29

Test for glycoproteins

Answer 29

Molisch’s Test

Question 30

Reagent and positive result for Molisch’s Test

Answer 30

Reagent: 5% α-naphtol + 95% ethanol + conc. H2SO4
+ result: violet ring

Question 31

This protein is soluble in water and can coagulated by heat

Answer 31

Albumin

Question 32

This protein is insoluble in water but soluble in dilute solutions of neutral salts.

Answer 32

Globullins

Question 33

Insoluble in water and dilute solution of neutral salt but are soluble in dilute acid and alkali. It can also be coagulated by heat.

Answer 33

Glutelins

Question 34

The protein is insoluble in water but soluble in 60 – 80% ethyl alcohol.

Answer 34

Prolamines