When fat is heated with ${\rm{NaOH}}$ the substances formed are:

Oil and ${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3}$

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NEET • CHEMISTRY • BIOMOLECULES

Biomolecules practice · Mixed difficulty

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121 Medium

121 of 191

Understanding +4 | -1

What is not true for enzymes?

View answer and explanation

Correct option: D

They do not lose activity on heating

Option D (They do not lose activity on heating) is correct because enzymes are proteins and generally denature and lose activity when heated.

122 Medium

122 of 191

Remembering +4 | -1

Tributyrin is a fat present in butter. It is formed by combination of butyric acid with:

View answer and explanation

Correct option: A

Glycerol

Option A (Glycerol) is correct because tributyrin, a fat in butter, is formed by the combination of butyric acid with glycerol.

123 Medium

123 of 191

Analyzing +4 | -1

Which of the following nucleotide sequences contains 4 pyrimidine bases?

View answer and explanation

Correct option: A

GATCAATGC

The correct answer is A (GATCAATGC) because pyrimidine bases are Cytosine (C), Thymine (T), and Uracil (U). The sequence GATCAATGC contains four pyrimidine bases: two Thymines (T) and two Cytosines (C).

124 Easy

124 of 191

Remembering +4 | -1

Which one of the following sets of monosaccharides forms sucrose?

View answer and explanation

Correct option: D

\alpha

-D-Glucopyranose and

\beta

D-fructofuranose

The correct answer is D (

\alpha

-D-Glucopyranose and

\beta

D-fructofuranose) because sucrose is formed from

\alpha

-D-glucopyranose and

\beta

-D-fructofuranose linked by a glycosidic bond between C1 of glucose and C2 of fructose.

125 Hard

125 of 191

Understanding +4 | -1

Assertion: The bond between adenine and thymine is stronger than the bond between Cytosine and guanine.

Reason: Cytosine and guanine have a triple hydrogen bond while adenine and thymine have a double hydrogen bond.

View answer and explanation

Correct option: D

Assertion is wrong, but reason is correct statement.

Option D (Assertion is wrong, but reason is correct statement) is correct because the bond between cytosine and guanine is stronger due to three hydrogen bonds, while adenine and thymine have only two.

126 Medium

126 of 191

Understanding +4 | -1

When fat is heated with

\mathrm{NaOH}

the substances formed are:

View answer and explanation

Correct option: B

Soap and glycerol

Option B (Soap and glycerol) is correct because the reaction of fat with NaOH (saponification) produces soap (sodium salt of fatty acids) and glycerol.

127 Hard

127 of 191

Remembering +4 | -1

Purines possess nitrogen at

View answer and explanation

Correct option: C

1, 3, 7 and 9 position

Option C (1, 3, 7 and 9 position) is correct because purines, which include adenine and guanine, have nitrogen atoms at the 1, 3, 7, and 9 positions in their ring structure.

128 Medium

128 of 191

Application +4 | -1

Find the isoelectric point of glycine whose

\mathrm{pK}_1

and

\mathrm{pK}_2

values are

2.4

and

9.6

respectively.

View answer and explanation

Correct option: A

Option A (6) is correct because the isoelectric point is calculated as the average of pK1 and pK2, which results in 6.

129 Easy

129 of 191

Remembering +4 | -1

The most abundant organic compound in the world is :

View answer and explanation

Correct option: D

Cellulose

The correct answer is D (Cellulose) because cellulose is the most abundant organic compound in the world, forming the structural component of plant cell walls.

130 Easy

130 of 191

Understanding +4 | -1

Which of the following is not a classification of proteins?

View answer and explanation

Correct option: B

Antibiotics

Option B (Antibiotics) is correct because antibiotics are a class of drugs used to treat bacterial infections, and are not a classification of proteins themselves. Enzymes, antigens, and hormones can all be proteins.

131 Medium

131 of 191

Understanding +4 | -1

Which of the following test or reaction is not given by glucose –

View answer and explanation

Correct option: C

Schiff's test

Option C (Schiff's test) is correct because glucose, being a stable cyclic hemiacetal in solution, does not readily give a positive Schiff's test, which is characteristic of free aldehydes.

132 Hard

132 of 191

Understanding +4 | -1

The incorrect statement regarding enzymes is :

View answer and explanation

Correct option: D

Enzymes are polysaccharides.

Option D (Enzymes are polysaccharides) is correct because enzymes are proteins, not polysaccharides.

133 Hard

133 of 191

Understanding +4 | -1

Which of the following statements regarding carbohydrates are correct?

(i) Lactose is the carbohydrate found in milk.

(ii) More than 25 monosaccharides occur naturally.

(ii) Sucrose on hydrolysis gives one molecule each of glucose and fructose.

(iv) Maltose is a non-reducing sugar whereas sucrose is a reducing disaccharide sugar.

View answer and explanation

Correct option: B

(i) and (iii)

Option B ((i) and (iii)) is correct because lactose is found in milk, and sucrose hydrolysis yields glucose and fructose. Maltose is a reducing sugar, and only about 20 monosaccharides occur naturally.

134 Hard

134 of 191

Application +4 | -1

Number of cyclic tripeptides formed with 2 amino acids

A

and

B

is:

View answer and explanation

Correct option: B

Option B (2) is correct because with two amino acids A and B, only two cyclic tripeptides can be formed: AAA and BBB. Other combinations like AAB, ABA, BAA, BBA, BAB, ABB are not cyclic tripeptides formed with only 2 amino acids.

135 Medium

135 of 191

Remembering +4 | -1

Starch can be used as an indicator for the detection of the traces of:

View answer and explanation

Correct option: C

Iodine in aqueous solution

Option C (Iodine in aqueous solution) is correct because starch forms a characteristic blue-black complex with iodine, making it a suitable indicator for iodine detection.

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136 Easy

136 of 191

Remembering +4 | -1

Which one of the following is an example of a non-reducing sugar?

View answer and explanation

Correct option: A

Sucrose

Option A (Sucrose) is correct because it lacks a free aldehyde or ketone group due to the glycosidic linkage involving both anomeric carbons.

137 Easy

137 of 191

Remembering +4 | -1

Deficiency of which vitamin causes scurvy?

View answer and explanation

Correct option: C

Vitamin C

Option C (Vitamin C) is correct because a deficiency in Vitamin C causes scurvy.

138 Easy

138 of 191

Remembering +4 | -1

Waxes are esters of

View answer and explanation

Correct option: D

Long chain alcohols and long chain acids

Option D (Long chain alcohols and long chain acids) is correct because waxes are esters formed from the reaction of long-chain fatty acids and long-chain alcohols.

139 Hard

139 of 191

Remembering +4 | -1

The bonds between Guanine and Cytosine

View answer and explanation

Correct option: B

3-H bonds

Option B (3-H bonds) is correct because Guanine and Cytosine are held together by three hydrogen bonds in DNA and RNA.

140 Medium

140 of 191

Remembering +4 | -1

Which among the following pairs of Vitamins is stored in our body relatively for longer duration?

View answer and explanation

Correct option: C

Vitamin A and Vitamin D

Option C (Vitamin A and Vitamin D) is correct because Vitamin A and Vitamin D are fat-soluble vitamins and can be stored in the body for longer periods compared to water-soluble vitamins like Ascorbic acid and Thiamine.

141 Easy

141 of 191

Remembering +4 | -1

Protein gives blue colour with

View answer and explanation

Correct option: C

Ninhydrin

Option C (Ninhydrin) is correct because proteins react with ninhydrin to give a blue-purple color.

142 Hard

142 of 191

Remembering +4 | -1

DNA multiplication is called as

View answer and explanation

Correct option: D

replication

Option D (replication) is correct because DNA multiplication is the process of creating two identical copies of DNA from one original DNA molecule, known as replication.

143 Hard

143 of 191

Understanding +4 | -1

Identify incorrect statement regarding glucose.

View answer and explanation

Correct option: D

\alpha

-form of glucose has higher melting point than its

\beta

-form

Option D is the incorrect statement because the

\beta

-form of glucose has a higher melting point than its

\alpha

-form.

144 Easy

144 of 191

Remembering +4 | -1

Lactose has the same molecular formula as:

View answer and explanation

Correct option: B

Maltose

The correct answer is B (Maltose) because lactose and maltose are both disaccharides with the same molecular formula

{C_{12}}{H_{22}}{O_{11}}

145 Easy

145 of 191

Understanding +4 | -1

Which of the following is the first member of monosaccharides?

View answer and explanation

Correct option: B

C{H_2}OH-CHOH\mathrm{ }-CHO

Option B (

C{H_2}OH-CHOH\mathrm{ }-CHO

) is correct because it represents glyceraldehyde, the simplest aldose (monosaccharide) with three carbon atoms.

146 Medium

146 of 191

Remembering +4 | -1

Cheilosis is caused by the deficiency of which vitamin?

View answer and explanation

Correct option: B

Riboflavin

Option B (Riboflavin) is correct because Cheilosis (cracking at the corners of the mouth) is a symptom of Riboflavin (Vitamin B2) deficiency.

147 Medium

147 of 191

Remembering +4 | -1

Increased blood pressure may be caused by excess secretion of:

View answer and explanation

Correct option: D

Adrenaline

Option D (Adrenaline) is correct because excess secretion of adrenaline can cause increased blood pressure due to its effects on the cardiovascular system.

148 Easy

148 of 191

Remembering +4 | -1

The segment of DNA which acts as the instrumental manual for the synthesis of the protein is:

View answer and explanation

Correct option: D

Gene

Option D (Gene) is correct because a gene is a segment of DNA that contains the instructions for synthesizing a protein.

149 Hard

149 of 191

Analyzing +4 | -1

Which of the following statements are false regarding the nature of amino acids?

A. The acidity and neutrality of amino acids is based on number of amino and carboxyl groups.

B. Both

\mathrm{NH}_2

and

\mathrm{COOH}

groups of amino acids show ionizable nature.

C. In solutions of different

\mathrm{pH}

, the structure of amino acids does not change.

D. The amino acids have amino group and aldehyde group as substituents on the same carbon.

View answer and explanation

Correct option: B

\mathrm{CD}

Option B (CD) is correct because statement C is false (amino acid structure changes with pH) and statement D is false (amino acids have an amino group and a carboxylic acid group, not an aldehyde group).

150 Medium

150 of 191

Application +4 | -1

A sample of (D)-lactic acid was found to have an optical purity of

72 %

. How much (L)-isomer is present in the sample?

View answer and explanation

Correct option: D

14 \%

Option D (14%) is correct because the optical purity is 72%, meaning 72% is the D-isomer in excess. The remaining 28% is racemic, so half of that (14%) is the L-isomer.

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Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.

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Biomolecules practice · Mixed difficulty

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