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amino acids

Total questions: 46

Worksheet time: 34mins

Name
Class
Date
1.

Identify the amino acids containing nonpolar, aliphatic R groups.

a)

Phenylalanine, tyrosine, and tryptophan

b)

glycine, alanine, leucine

c)

lysine, histidine and arginine

d)

aspartate, glutamate

2.

If pK1 = 2.34 and pK2 = 9.60, then the isoelectric point pI is?

a)

6,0

b)

5.96

c)

5.97

d)

6.02

3.

Which of the following is a true statement?

a)

Aspartate is an essential amino acid

b)

Lysine is a non-essential amino acid

c)

Leucine is commonly used as an ingredient in the buffers of SDS page

d)

Tryptophan and tyrosine are significantly more polar than phenylalanine

4.

The single letter symbol of aspartic acid is

a)

A

b)

C

c)

D

d)

E

5.

Number of chiral centers in isoleucine is?

a)

1

b)

2

c)

3

d)

4

6.

Which among the following is both glucogenic and ketogenic?

a)

leucine

b)

lysine

c)

histidine

d)

isoleucine

7.

The amino acid commonly used as an ingredient in the buffer of SDS PAGE

a)

aspartic acid

b)

glycine

c)

glutamic acid

d)

histidine

8.

Total number of protein building amino acids is

a)

20

b)

21

c)

22

d)

23

9.

amino acids with aromatic side chains are

a)

proline, alanine , leucine

b)

tryptophan, proline, aspartate

c)

tryptophan, phenyl alanine, tyrosine

d)

tryptophan. tyrosine, alanine

10.

The difference between amino acid and imino acid is

a)

bonding of carbonyl group with amide group

b)

bonding of nitrogen in the amide group

c)

bonding of nitrogen in the carboxyl group

d)

presence of covalent bond between amide and carbonyl group

11.

which of the following are Sulphur containing amino acids

a)

methionine and histidine

b)

cysteine and methionine

c)

cysteine and threonine

d)

methionine and threonine

12.

out of these , the acidic amino acids are

a)

aspartic acid and histidine

b)

aspartate and glutamine

c)

asparagine and glutamate

d)

aspartic acid and glutamic acid

13.

imidazole group as a side chain is present in

a)

histidine

b)

glycine

c)

lysine

d)

tryptophan

14.

N-

terminal amino acid in a protein is determine by

a)

ninydrin reagent

b)

formaldehyde

c)

sangers reagent

d)

carboxypeptidase

15.

Though there occur around 300 amino acids in

nature only 20 amino acids make up all proteins. This is because

a)

of their structural similarity

b)

these are more stable and easily syntheiszed

c)

only these 20 amino acids are chemically versatile

d)

of the universal nature of the genetic code for these 20 amino acids

16.

hydroxyl group containing amino acids are

a)

cysteine, serine, threonine

b)

serine, lysine and histidine

c)

tryptophan, serine and threonine

d)

tryptophan , lysine, serine

17.

indole ring is present in

a)

proline

b)

histidine

c)

tryptophan

d)

lysine

18.

Absorbance at 280 nm exhibited by protein is due to presence of

a)

polar amino acids

b)

nonpolar amino acids

c)

aromatic amino acids

d)

hydroxyl group containing amino acids

19.

the amino acid that tastes bitter is

a)

leucine

b)

histidine

c)

arginine

d)

proline

20.
The bond that joins amino acids are called:
a)
Peptide Bonds
b)
Ester Bonds
c)
Glycosidic Linkages
d)
Phosphodiester Bonds
21.
Amino acids all have the same general structure except for the:
a)
Amino Group
b)
Carboxyl Group
c)
'R' Group
d)
Carbonyl Group
22.
The amino acid isomer that is used to produce the proteins of all living things is the 
a)
L-Isomer
b)
D-Isomer
c)
α-Isomer
d)
β-Isomer
23.
The amino acid that results in disulphide bridges is:
a)
Cysteine
b)
Alanine
c)
Glutamic Acid
d)
Valine
24.

The simplest amino acid which can accommodate in a small space is

a)

proline

b)

alanine

c)

glycine

d)

valine

25.

cystine is the combination of

a)

cystine-methionine

b)

methionine-serine

c)

cysteine-cysteine

26.

mention any acidic amino acid

(a)  

27.

Are these statements about amino acids true or false?

In the solid state amino acids exists as zwitterions

a)

true

b)

false

28.

Select correct name for the amino acid shown

a)

Ala

b)

Cys

c)

Trp

d)

His

29.

Select correct names for the amino acids shown

a)

Leu - Ile - Phe

b)

Val - Leu - Ile

c)

Phe - Tyr - Trp

d)

Lys - Arg - His

30.

If a methyl group (-CH3), which does not like water, were at the 'R', the amino acid would likely be:

a)

Hydrophobic

b)

Hydrophilic

c)

Ionic

d)

Acidic

31.
The primary sequence of a protein refers to the:
a)
Order of amino acids
b)
α-Helix or β-Pleated Sheet
c)
Interaction of subunits
d)
Hydrogen Bonding
32.
What kinds of food can you get protein from in your diet?
a)
Eggs
b)
Meat and Fish
c)
Nuts and Legumes
d)
All of the above
33.
What is a peptide bond?
a)
Bond that holds two amino acids together.
b)
A bond that holds hydrogen and oxygen molecules together.
c)
A bond that holds the phosphate group of one nucleotide and a sugar of a neighboring nucleotide.
d)
A bond that is formed by the sharing of electrons.
34.

which amino acid contain the aromatic ring

a)

threonine

b)

tryptophan

c)

tyrosine

35.

Phenyl isothiocyanate is used in

a)

sanger's method

b)

Edman's method

c)

Hydrizinalysis

d)

None of the above

36.

what is is isoelectric point (pI) of amino acids?

a)

pH where there is equal number of zwitter ions and cations

b)

pH where there is equal number of anions and zwitter ions

c)

pH where the amino acid as zwitter ion carries no net charge

d)

pH where the amino acid as zwitter ion carries net charge

37.

In the folding of proteins, the amino acids that are hydrophilic will

a)

stay in the middle

b)

move to the outside

c)

move to the inside

d)

not change

38.

Hydrophilic amino acid side chains are attracted by

a)

H20 molecules

b)

K molecules

c)

Na molecules

d)

Cl molecules

39.

Hydrophobic amino acid side chains are

a)

forced to go to outside of protein

b)

electrically negative

c)

electrically positive

d)

electrically neutral and nonpolar

40.

In oil hydrophobic nonpolar amino acids will

a)

group together

b)

effectively dissolve

c)

move to the inside of the protein

d)

move to the outside of the protein

41.

What species is produced when 2-aminopropanoic acid (pI = 6) is dissolved in a solution with pH = 2?

a)
b)
c)
d)
42.

According to biochemical classification of amino acids valine is __________?

a)

with non polar side chain

b)

with polar side chain

c)

with positive side chain

d)

with negative side chain

43.

Number of chiral centers in glycine (Gly) is ?

a)

0

b)

1

c)

2

d)

3

44.

Chiral Center Leucine?

a)

0

b)

1

c)

2

d)

3

45.

Chiral Center Isoleucine ?

a)

0

b)

1

c)

2

d)

3

46.

Name the peptide N-C-W

a)

Tryptophylcysteinylasparagine

b)

Asparaginylcysteinyltryptophan

c)

Asparagylcysteyltryptophyl

d)

Asparagylcysteinyltryptophan

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