Biomolecules Test

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Biomolecules Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is synthetic sweetener?

A
Saccharin

B
Aspartame

C
Dulcin

D
All of the above

Solution

Saccharin, aspartame, dulcin all are synthetic sweetener. They have a sugar-like taste but with less food energy.
Artificial sweeteners are used in one of two ways. They may be used directly in commercially processed foods, or they are mixed with one or more starch-based sweeteners before sale to consumers.

$$\therefore$$ Option D is the correct answer.
Question 2
1 / -0

Starch undergoes hydrolysis in presence of mineral acids to form:

A
glucose

B
fructose

C
maltose

D
sucrose

Solution

Starch undergoes hydrolysis in presence of mineral acids to form glucose.
$$\underset{\begin{matrix}starch\, or\\cellulose\end{matrix}}{(C_6H_{12}O_5)_n} + nH_2O \xrightarrow[\begin{matrix} 393K\\2-3 \,bars\end{matrix}]{H^+} \underset{glu\,cose}{nC_6H_{12}O_6}$$
Question 3
1 / -0

Number of $$C=O$$ groups in thymine and X are equal. Now, X is

A
cytosine

B
uracil

C
adenine

D
guanine

Solution

Number of $$C=O$$ groups in thymine is same as in uracil. Both contains 2 $$C=O$$ groups.
Question 4
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If the amino group of glycine and carboxylic acid group of alanine undergo elimination of water molecule, the name of the compound thus formed is

A
alanylglycide (dipeptide)

B
glycylalanide (tripeptide)

C
glycylalanine (dipeptide)

D
alanylglycine (dipeptide)

Solution

If the amino group of glycine and carboxylic acid group of alanine undergo elimination of water molecule, the formed compound is glycylalanine (dipeptide).
Question 5
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The functional group which is found in amino acid is

A
$$COOH$$

B
$$NH_{3}$$

C
$$CH_{3}$$

D
both A & B

Solution

Option (D) is correct. The functional group which is found in amino acid are $$COOH$$ and $$NH_3$$ (amine group). So every amino acid has a central carbon with a $$H$$, $$R$$ group (varies for each amino acid), a carboxylic group and an amine group. These groups are joined to a single (aliphatic) carbon. The carbon directly attached to a carboxyl group is the alpha position, so the amino acids in proteins are all alpha-amino acids.
$$H_2N - \underset{R}{\underset{|}{\overset{H}{\overset{|}{C}}}} - COOH$$
Question 6
1 / -0

Match the following
Set A Set B
1. Adenine a. $$C_5N_5H_5O$$
2. Guanine b. $$C_4N_2H_4O_2$$
3. Uracil c. $$C_5N_5H_5$$
4. Thymine d. $$C_5N_2H_6O_2$$

A
1-c; 2- a; 3-d; 4-b

B
1-c; 2-b; 3-d; 4-e

C
1-b; 2-c; 3-d; 4-a

D
1-c; 2- a; 3- b; 4-d

Solution

Option (D) is correct.
(1) Adenine has molecular formula of $$C_5N_5H_5$$.
(2) Guanine has molecular formula of $$C_5N_5H_5O$$.
(3) Uracil has molecular formula of $$C_4N_2H_4O_2$$.
(4) Thymine has molecular formula of $$C_5N_2H_6O_2$$.
Question 7
1 / -0

Which of the following amino acids does not correspond to the general formula: $$R - CH(NH_{2}) - COOH$$?

A
Cysteine

B
Proline

C
Argenine

D
Glutamic acid

Solution

Among the given amino acids, cysteine, arginine and glutamic acid correspond to the general formula $$R - CH(NH_2) - COOH$$.

However, proline does not correspond to the general formula $$R - CH(NH_2) - COO$$, as N is a part of a ring.

Option B is correct.
Question 8
1 / -0

Which of the following is not optically active?

A
Glycine

B
Lysine

C
Aspartic acid

D
Isoleucine

Solution

Glycine is not optically active.

A optically active compound should have atleast one carbon atom attached to four different groups.

Glycine is not active because it has carbon atom attached to 2 hydrogen atoms, 1 amino group and 1 carboxylic group.

Option A is correct.
Question 9
1 / -0

IUPAC name of glycine is:

A
2-Aminopropanoic acid

B
2-Aminobutanoic acid

C
2-Aminoethanoic acid

D
2-Aminopent-1,5-dioic acid

Solution

IUPAC name of glycine is 2-Aminoethanoic acid.
Its molecular formula is $$NH_2CH_2COOH$$.

Hence,Option C is the correct answer.
Question 10
1 / -0

The most common reagent for qualitative and quantitative analysis of amino acids is:

A
Ninhydrin reagent

B
Millon's reagent

C
Sangars reagent

D
Edmanns reagent

Solution

The most common reagent for qualitative and quantitative analysis of amino acids is Millon's reagent.

Million's reagent is a solution that is usually made by dissolving mercury in concentrated nitric acid and diluting with water and that when heated with phenolic compounds gives a red coloration, for proteins (especially tyrosine amino acids).

Option B is correct.

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Re-Attempt Weekly Quiz Competition

Set A	Set B
1. Adenine	a. $$C_5N_5H_5O$$
2. Guanine	b. $$C_4N_2H_4O_2$$
3. Uracil	c. $$C_5N_5H_5$$
4. Thymine	d. $$C_5N_2H_6O_2$$

Biomolecules Test - 36

Result

Biomolecules Test - 36

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Question 1

Saccharin

Aspartame

Dulcin

All of the above

Solution

Question 2

glucose

fructose

maltose

sucrose

Solution

Question 3

cytosine

uracil

adenine

guanine

Solution

Question 4

alanylglycide (dipeptide)

glycylalanide (tripeptide)

glycylalanine (dipeptide)

alanylglycine (dipeptide)

Solution

Question 5

$$COOH$$

$$NH_{3}$$

$$CH_{3}$$

both A & B

Solution

Question 6

1-c; 2- a; 3-d; 4-b

1-c; 2-b; 3-d; 4-e

1-b; 2-c; 3-d; 4-a

1-c; 2- a; 3- b; 4-d

Solution

Question 7

Cysteine

Proline

Argenine

Glutamic acid

Solution

Question 8

Glycine

Lysine

Aspartic acid

Isoleucine

Solution

Question 9

2-Aminopropanoic acid

2-Aminobutanoic acid

2-Aminoethanoic acid

2-Aminopent-1,5-dioic acid

Solution

Question 10

Ninhydrin reagent

Millon's reagent

Sangars reagent

Edmanns reagent

Solution

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