Biomolecules Test

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Biomolecules Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following vitamins are water soluble?

A
$$A$$

B
$$E$$

C
$$C$$

D
$$D$$

Solution

Vitamin C is the only water soluble vitamin. Vitamin A,E and D are all fat soluble vitamins.
So, the correct answer is 'C'

Question 2

1 / -0

Find out the incorrect combination of enzyme, source, substrate and product obtained :-

	Enzyme	Source	Substrate	Product
(1)	pepsin	Stomach chief cells	Protein	proteoses, peptone
(2)	Amino peptidase	small intestine	peptide	dipeptide, AA
(3)	Enterokinase	small intestine	Trypsin	Trypsinogen
(4)	$$\alpha-$$Amylase	sallvary glands	starch	Maltose

(1)

(2)

(3)

(4)

Solution

A . 1

Solution : The stomach chief cells secrete pepsinogen that is inactive form of pepsin that digests the proteins into peptides in the stomach.

So the correct answer is " 1 "

Question 3
1 / -0

Which of the following test cannot be used for identifying amino acids?

A
Biuret test

B
Xanthoproteic test

C
Barfoed test

D
Ninhydrin test

Solution

Barfoed's test is a chemical test used for detecting the presence of monosaccharides. It is based on the reduction of Copper (II) acetate to Copper (I) oxide, which forms a brick-red precipitate

Biuret test , Xanthoproteic test , Ninhydrin test are used for identifying Amino Acids
Question 4
1 / -0

Which one of the following statement is correct?

A
All amino acids except lysine are optically active

B
All amino acids are optically active

C
All amino acids except glycine are optically active

D
All amino acids except glutamic acid are optically active.

Solution
Question 5
1 / -0

Which of the following have carbohydrate as prosthetic group?

A
Glycoprotein

B
Chromoprotein

C
Lipoprotein

D
Nucleoprotein

Solution

Glycoproteins are proteins which contain oligosaccharides chains covalently attached to amino and side chains. The carbohydrate is attached to the protein in a cotranslational or posttranslational modification. This process is known as glycosylation.
So, option A is the correct option.
Question 6
1 / -0

The most abundant enzyme of the world is related to all, except ______________.

A
Heat sensitivity

B
Photorespiration

C
Have much greater affinity for $$O_2$$ than $$CO_2$$ when $$CO_2:O_2$$ is nearly equal.

D
Have $$Mg^{2+}$$ as its activator.

Solution

Ribulose -1,5-bisphosphate carboxylase oxygenase, commonly known by the abbreviations Rubisco, is an enzyme involved in the first major step of carbon fixation, a process by which the atmospheric carbon dioxide is converted by plants and other photosynthetic organisms. It is most abundant enzyme on earth.
Question 7
1 / -0

What affect does Ph have on enzyme?

A
Change Shape

B
Change Charge Properties

C
Let Undergo Catalysis

D
Both A and B

Solution

As pH increases, enzyme activity increases until it reaches an optimal point in which enzymes denatures and as pH increases, enzyme activity decreases.
So the correct answer is option C.
Question 8
1 / -0

People who take satin drugs to control their blood cholesterol may also take 'coenzyme $$Q_{10}$$'. The diagram shows a simplified structure of one form of this coenzyme.
Which row describes this structure correctly?

the coenzyme is number of $$\pi$$ bonds in one molecule
A an aldehyde $$n+2$$
B an aldehyde $$n+4$$
C a ketone $$n+2$$
D a ketone $$n+4$$

A
A

B
B

C
C

D
D

Solution

The given form of coenzyme is ketone as the compound contains keto group $$\left( -\overset{\underset{||}{O}}{C}-\right)$$ and from the given structure, it can be easily calculated that the number of $$\pi$$ bonds in one molecule of it is $$n+4$$.
Hence row D correctly describes the given structure.
Question 9
1 / -0

Structure of Guanine is

A

B

C

D
None

Solution

guanine structure
Question 10
1 / -0

Fructose is

A
a simple carbohydrate which follows empirical formula

B
a complex carbohydrate which follows empirical formula

C
a simple carbohydrate which does not follow empirical formula

D
a complex carbohydrate which does not follows empirical formula