Biomolecules Test

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Biomolecules Test - 63

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Weekly Quiz Competition

Question 1
1 / -0

What is the nature of glucose-glucose linkage in starch that males its so susceptible to acid hydrolysis?

A
Starch is hemiacetal

B
Starch is acetal

C
Starch is polymer

D
Starch contain only few molecules of glucose

Solution
Question 2
1 / -0

Which of the following is the monomer of cellulose?

A
$$\beta-D$$-glucose

B
Amylose

C
Amylopectin

D
Glycogen

Solution

Monomer of Cellulose is $$\beta - D- glucose$$.
Question 3
1 / -0

A polypeptide on complete hydrolysis gives three amino acids. How many sequences are possible for that polypeptide?

A
1

B
3

C
6

D
9

Solution
Question 4
1 / -0

In fructose and glucose the possible optical isomers are:

A
12, 12

B
8, 16

C
16, 8

D
4, 12

Solution

Fructose contains three chiral carbon atom and glucose contain 4 chiral carbon atoms.
The Number of possible Optical isomers for Fructose are $${2}^{3} = 8$$
The Number of possible Optical isomers for Glucose are $${2}^{4} = 16$$
8, 16 is the Answer
Question 5
1 / -0

A carbohydrate $$X$$ having molecular weight $$180g{mol}^{-1}$$ has one primary alcohol group and four secondary alcoholic groups. It reacts with acetic anhydride to form pentaacetate. The molecular weight of pentaacetate formed is:

A
$$180$$

B
$$210$$

C
$$390$$

D
$$42$$

Solution

X is Glucose.
The Weight of Glucose Pentaacetate formed is 390
Question 6
1 / -0

Which of the following is not catalysed by a brush border enzyme?

A
Maltose $$ \underrightarrow {Maltase }$$ glucose+ glucose

B
Lactose $$ \underrightarrow { Lactase }$$ glucose+galactose

C
Starch $$ \underrightarrow { Amylase}$$ Disaccharide

D
Nucleotides $$ \underrightarrow { Nucleotidase }$$ Nucleoside

Solution

Maltase, Lactase, and Nucleotidase are brush-border enzymes that catalyze the final catabolism of metabolites in the small intestine.

So the correct option is C.
Question 7
1 / -0

The two forms of $$D-$$glycopyranose obtained from solution of $$D-$$glucose are known as

A
Epimers

B
Anomers

C
Enantiomers

D
Geometrical isomers

Solution
Question 8
1 / -0

A dextro-rotatory sugar present in fruits is

A
Glucose

B
Fructose

C
Cellulose

D
Starch

Solution

(A) is the correction option. Natural glucose obtained from fruits is a dextro-rotatory isomer. So, it is denoted as (+) Glucose.
Question 9
1 / -0

Number of $$HIO_4$$ molecule required to complete oxidation one mole of glucose is :

A
4

B
5

C
6

D
None of these

Solution

Question 10

1 / -0

Jitesh carried out a steady-state kinetics experiment for an enzyme degradase with and without molecule X as pat of the reaction mixture. The reactions were carried out for $$5$$ minutes and he got the following results:

Substrate Concentration (milliMolar)	Amount of product formed without X (milliMoles)	Amount of product formed with X (milliMoles)
0.1	0.4	0.2
0.5	2.1	1.3
1.0	4.3	2.7
1.5	6.2	4.1
2.0	8.1	5.4
2.5	8.3	6.7
3.0	8.4	8.1
3.5	8.5	8.3

Molecule X is a competitive inhibitor

Molecule X is a allosteric inhibitor

Molecule X is a cofactor

Molecule X has no effect on cataysis

Solution

From the data given, it can be inferred that the presence of X considerably decreases the rate of formation of the product. This could be attributed to the fact that X is a competitive inhibitor of the product. Meaning that X competes for the same active site of the enzyme and does not let the substrate from binding to it.

So, the correct answer is 'Molecule X is a competitive inhibitor'.

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Re-Attempt Weekly Quiz Competition

Biomolecules Test - 63

Result

Biomolecules Test - 63

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SHARING IS CARING

Question 1

Starch is hemiacetal

Starch is acetal

Starch is polymer

Starch contain only few molecules of glucose

Solution

Question 2

$$\beta-D$$-glucose

Amylose

Amylopectin

Glycogen

Solution

Question 3

1

3

6

9

Solution

Question 4

12, 12

8, 16

16, 8

4, 12

Solution

Question 5

$$180$$

$$210$$

$$390$$

$$42$$

Solution

Question 6

Maltose $$ \underrightarrow {Maltase }$$ glucose+ glucose

Lactose $$ \underrightarrow { Lactase }$$ glucose+galactose

Starch $$ \underrightarrow { Amylase}$$ Disaccharide

Nucleotides $$ \underrightarrow { Nucleotidase }$$ Nucleoside

Solution

Question 7

Epimers

Anomers

Enantiomers

Geometrical isomers

Solution

Question 8

Glucose

Fructose

Cellulose

Starch

Solution

Question 9

4

5

6

None of these

Solution

Question 10

Molecule X is a competitive inhibitor

Molecule X is a allosteric inhibitor

Molecule X is a cofactor

Molecule X has no effect on cataysis

Solution

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