Biomolecules Test

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Biomolecules Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

Thiol group is present on:-

A
Methionine

B
Cytosine

C
Cystine

D
Cysteine

Solution
Question 2
1 / -0

Enzyme which catalyse the joining of C - O, C - S, C - N, P - O bonds :

A
Lyases

B
transferases

C
Hydrolases

D
ligases

Solution
Question 3
1 / -0

The ultimate product of hydrolysis of starch is :

A
glucose

B
fructose

C
sucrose

D
None of these

Solution

$$\text{starch is the polymer of glucose hence, on it's hydrolysis we get glucose as a product.}$$
Question 4
1 / -0

Cobalt as a rare element is essential in the synthesis of this vitamin _______.

A
$$C$$

B
$$D$$

C
$$B_1$$

D
$$B_{12}$$

Solution

(D) Vitamin $$B_{12}$$
Because cobalt is also an essential trace element for humans and found at center of $$B_{12}$$ and produces red blood cells.
Question 5
1 / -0

Which enzyme is responsible for the fermentation of sugar or molasses?

A
Sucrose

B
Zymase

C
Lactase

D
Selulose

Solution

Zymase is an enzyme complex that catalyzes the fermentation of sugar into ethanol and $$CO_2$$. It occurs naturally in yeasts. Zymase activity varies among yeast strains.
So, the correct option is option B.
Question 6
1 / -0

Ninhydrin reagent react with $$\alpha$$-amino acids to give a purple colour. In the reaction of ninhydrin with pheyl alanine.Which of the following responsible for this colour?

A

B

C

D

Solution
Question 7
1 / -0

L-alanine and D-alanine

A
Are present in virtually all products

B
Are superimposable of each other

C
Are enantiomers

D
lack and R group

Solution

Enantiomers are a pair of molecules that are mirror images of each other. L-alanine and D-alanine are enantiomers.
Question 8
1 / -0

Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?

A
Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at temperatures $$80^o$$-$$90^o$$C

B
Enzymes are highly specific

C
Most enzymes are proteins but some are lipids

D
Enzymes require optimum pH for maximal activity

Solution

Correct option: C

Explanation:
Enzymes are the biological catalyst that catalyzes biological reactions within a narrow range of temperature and pH.
Certain thermophiles have enzymes that remain functional even at very high temperatures.
Most of the enzymes are proteins in nature but a few enzymes are RNA in nature. They are called catalytic RNAs or ribozymes.
Question 9
1 / -0

Item 'I'
(compound) Item 'II'
(reagent)

(A) Lysine (P)I-naphthol
(B)Furfural (Q)ninhydrin
(C) Benzyl alcohol (R) $$KMnO_4$$
(D)Styrene (S)ceric ammonium

A
(A) $$\to (Q)$$,(B) $$\to (P)$$, (C) $$\to (S)$$, (D) $$\to (R)$$

B
(A) $$\to (Q)$$,(B) $$\to (R)$$, (C) $$\to (S)$$, (D) $$\to (P)$$

C
(A) $$\to (Q)$$,(B) $$\to (P)$$, (C) $$\to (R)$$, (D) $$\to (S)$$

D
(A) $$\to (R)$$,(B) $$\to (P)$$, (C) $$\to (Q)$$, (D) $$\to (S)$$

Solution

Lysine - Ninhydrin

Furfural - I naphthol

Benzyl alcohol - ceric ammonium

Styrene - $$KMn{O}_{4}$$

Option A is correct
Question 10
1 / -0

A compound with molecular mass 180is acylated. with [image] to get a compound with molecular mass 390. The no. of amino group present per molecule of the former compound is:

A
2

B
5

C
4

D
6

Solution

Acylation of an amine group is represented as follows

$$R-NH_2+CH_3COCl\rightarrow RNHCOCH_3+HCl$$

Since, each $$-COCH_3$$ group displace one H-atom in the single step so

increase in mass for each step= $$42u$$

$$\therefore \left.\begin{matrix}Increase\,in\,mass\,due\,to\\acylation,\Delta m \end{matrix}\right\}Mass\,after\, acylation-Mass\,before\,acylation$$

$$=(390-180)u$$

$$=210u$$

$$\therefore \left.\begin{matrix}No.of\,acylation\,in\,each\\molecules,n \end{matrix}\right\}\dfrac{increase\,in\,mass\,due\,to\,acylation}{Mass\,of\,each-COCH_3unit}$$

$$=\dfrac{210u}{42u}=5$$

$$\therefore \left.\begin{matrix}Number\,of\,amino\,group\,present\\per\,molecule\end{matrix}\right\}=5$$

(B) $$5$$ is correct.