Biomolecules

Sucrose on hydrolysis gives
1. glucose and galactosse
2. maltose and galactose
3. glucose and fructose
4. none of these
The twon forms of D-glucopyranose obtained from solution of D-glucose sre known as
1. Anomers
2. epimers
3. enantiomers
4. geometrical isomers
Glucose and fructose can be distinguishes by
1. Lucas test
2. Ninhydrin test
3. Benedict reagent rest
4. All of these
The number of chiral carbons in $β$ -D(+) glucose is
1. 5
2. 6
3. 3
4. all of these
Gums are :
1. polysaccharides of more than one type of monoaccharides
2. used as thickening agent
3. used for improvement of texture in food industry
4. all of these
Glucose reacts with methyl alcohol to give
1. $α$ - methyl glucoside
2. $β$ -methyl glucoside
3. both $α$ - methyl glucoside and $β$ -methyl glucoside
4. none of these
Starch is changed into disaccharides in presence of
1. diastase
2. maltase
3. lactase
4. zymase
Which carbohydrate is used in silvering of mirrors ?
1. Sucrose
2. Starch
3. Glucose
4. Fructose
Which is used for making rayon (artificial silk) ?
1. Starch
2. Cellulose
3. Terepthalic
4. Adipic acid
Animal starch is the name given for
1. Glycogens
2. lactogens
3. cellulose
4. none of these
The total number of C-atoms in $β$ -fructose are
1. 6
2. 5
3. 4
4. 7
Cellulose is a
1. monosaccharide
2. disaccharide
3. polysaccharide
4. none of these
Common table sugar is more formally described as
1. glucose
2. lactose
3. maltose
4. sucrose
Which does not contain carbohydrate ?
1. Cellulose
2. Wax
3. Starch
4. Wheat flour
Lactose has the same molecular formula as
1. glucose
2. maltose
3. laevulose
4. galactose
Dihydroxy acetone $(C H_{2} O H \cdot C O \cdot C H_{2} O H)$ has the general formula of carbohydrate but not incluses in this class becuase
1. it does not contain polyhydroxy group
2. it does not contain aldehyde group
3. it is not optically avtive
4. all of these
Dextrins $(C_{6} H_{10} O_{5})$ are used in
1. making adhesive
2. confectionary
3. sizing paper
4. all of these
Artificaial sweetner used in soft drinks is
1. glucose
2. fructose
3. cellulose
4. aspartame
The sugar presnt in honey is
1. sucrose
2. glucose
3. fructose
4. maltose
The reaction of glucose with red P+HI is called
1. Sandmeyer reaction
2. Reformatsky reaction
3. Gattermann reaction
4. Reduction
A solutiob of D-glucose in water rotates the plane polarized light
1. to the right
2. to the left
3. to either side
4. none of these
The intermediate compound in the conversion of starch to glucose is
1. lactose
2. maltose
3. fructose
4. sucrose
Which statement about ribose is incorrect?
1. A polyhydroxy compound
2. An aldehyde sugar
3. Has six carbon atoms
4. Exhibits optical activity
Which of the following enzymes are used to convert starch into alcohol ?
1. maltose,diastase
2. invertase ,zymase
3. Diastase,maltase ,zymase
4. Invertase ,diastase ,zymase
Which of the following gives reddish brown precipitate with dilute solution of resorcinol in dilute HCl?
1. Glucose
2. Fructose
3. Lactose
4. Maltose
Acetone may be obtained from starch by the action of
1. acid
2. bacteria
3. oxidising agent
4. none of these
Glucose on reduction with Na/Hg and water gives
1. sorbitol
2. fructose
3. saccharic acid
4. gluconic acid
The charring product formed when $C_{6} H_{12} O_{6}$ is heated with conc. $H_{2} S O_{4}$ is due to
1. oxidation
2. reduction
3. dehydration
4. dehydrogenation
Epimers are pair of diastereoisomeric aldoses which differ only in configuration at position
1. $C_{5}$
2. $C_{2}$
3. $C_{4}$
4. $C_{3}$
When glucose is heated with nitric acid , the product is
1. gluconic acid
2. glucaric acid
3. glyconic acid
4. oxalic acid
The polysaccharide used in the manufacture of paper is
1. cellulose
2. starch
3. glucose
4. sucrose
Complete hydrolysis of cellulose gives
1. D-glucose
2. L-glucose
3. D-fructose
4. D-ribose
Purity of butter is determined in terms of
1. saponification value
2. iodine value
3. acetyl value
4. Reichert -Meissl value
Lactose is made of
1. $α$ - D - glucose only
2. $β$ -D galactose and $β$ -D -glucose
3. $α$ -D-galactose and $α$ -D- glucosed
4. $β$ -D-galactose and $α$ -D - glucose
A nanopeptide contains..... peptide linkages
1. 10
2. 8
3. 9
4. 18
When sucrose is heated with concentrated nitric acid the product is :
1. saccharic acid
2. oxalic acid
3. formic acid
4. invert sugar
The change in optical rotation with time of freshly prepared solutions of sugar is known as
1. specific rotation
2. inversion
3. rotatory motion
4. mutarotaion
To become carbohydrate , a compound contain atleast
1. 6 carbons
2. 3carbons
3. 4carbons
4. 2carbons
Which of the following metal ions is essential inside the cell for the metabolism of glucose/syntehesis of proteins ?
1. $N a^{+}$
2. $K^{+}$
3. $M g^{2 +}$
4. $C a^{2 +}$
Which of the following $α$ -amino acids is not optically active ?
1. Alanine
2. Glycine
3. Phenyalalnine
4. Cysteine
A certain compound gives negative test with ninhydron and positive test with Benedict's solution , the compound is
1. a protein
2. a lipid
3. a monosaccharide
4. an amino acid
The name of the dipeptide

$H_{2} N \underset{|}{C} H C o N H C H_{2} C O O H C H_{3}$
1. Glycylglycine
2. Glycylalanine
3. Glycine alanine
4. Alanylglycine
Biuret test is not given by
1. proteins
2. urea
3. polypeptide
4. Carbohydrate
The force of attraction between the neighbouring peptide chain is
1. van der Waals force
2. Covalent bond
3. Hydrogen bond
4. Peptide bond
Which of the following amino acid is not optically active ?
1. Lysine
2. Tyrosine
3. Glycine
4. Alanine
A mixture contains three amino acids A (pH=3.2), B(pH=5.7) and C (Ph=9.7).
When it is subjected to electrophoresis at pH7.7 , in which direction will each component of the mixture move ?
1. A to anode , B and C to cathode
2. A to anode , B no movement ,C to cathode
3. A and B to anode and C to cathode
4. A to cathode , B no movement ,C to anode
Lysine is least soluble in water in the pH range
1. 3 to 4
2. 5 to 6
3. 6 to 7
4. 8 to 9
Consider the following componds
(I) Glycine
(II) Sulphanilic acid
(III) Anthranilic acid
which can form dipolar (Zwitter) ion?
1. I and II
2. I,II and III
3. II and III
4. I and III
Which of the following is heterocyclic amino acid ?
1. Tryptophan
2. Phenylalanine
3. Glycine
4. Alanine
Which of the following statements is true for protein synthesis (translation)?
1. Amino acids are directly recognize by m-RNA
2. The third base of the codon is less specific
3. Only one codon codes or an amino acid
4. Every t-RNA molecules has more than ane amino acid attachment
The $p K_{a_{1}}$ and $p K_{a_{1}}$ of an amino acid are 2.3 and 9.7 respectively. The isoelectric point of the amino acid is
1. 6.0
2. 3.7
3. 12.0
4. 7.4
Peptides are formed by the joining of amino acids through amide linkage . Whcih of the following statement is not true in this respect ?
1. Amide groups do not contribute in the hydrogen bonding interactions
2. $p π$ resonance stabilizes the amide linkages
3. amide groups are more resistant to hydrolysis than the similar ester groups
4. Stable confrmations of peptides are restricted to those having planar amide groups
Which one of the given proteins transports oxygen in the blood stream?
1. Myoglobin
2. Insulin
3. Albumin
4. Haemoglobin
Which of the following is not considered a part of the tertiary structure of proteins ?
1. The restricted rotation in amide bonds
2. The hydrophobic effect
3. The electrostatic interactions
4. The hydrogn bonds
Which amino acid has no asymmetric carbon?
1. Histidine
2. Threonine
3. $α$ - alanine
4. Glycine
The most important contribution to the stability of a protein conformation appears to be the
1. entropy increase from the decrease in ordered water molecules forming a solven shell around it
2. maximum entropy increase from ionic interactions between the ionized amino acids in a protein
3. sum of free energies of formation of many weak interactions between its polar amino acids and surrounding water molecules
4. sum of free energies of formation of many weak interactions among the hundreads of amino acids in a protein
Vitamin C is :
1. ascorbic acid
2. lactic acid
3. citric acid
4. paracetamol
Which of the following base is not present in DNA?
1. Cytosin
2. Guanine
3. Uracil
4. Adenine
Which of the following is not a fat soluble viatmin?
1. Viatamin A
2. Vitamin K
3. Folic acid
4. Vitamin E
Which of the following statements is not true?
1. Pheromones are secreted outside the body by the insects
2. Aspirin in analgesis and antipyretic
3. Sucrose is a dipeptide commonly known as aspartame
4. nucleotide
The segement of DNA which acts as the instrumental manual for the synthesis of the protein is
1. ribose
2. gene
3. nucleoside
4. nucleotide
DNA multiplication is called
1. Translation
2. transduction
3. replication
4. transcription
The pair in which both are species have iron is:
1. Nitrogenase , Cytochromes
2. Carboxypepatidase ,haemoglobin
3. Haemocyanin, nitrogenase
4. haemoglobin,cytochromes
The anti-sterility or anti-reproductivity vitamin is :
1. Viatmin B
2. Viatmin C
3. Viatmin D
4. Viatmin E
Vitamin $B_{1}$ is chemically known as
1. ascorbic acid
2. ribofalvin
3. pyridoxine
4. thiamine
The hormone that helps in conversion of glucose to glycogen is
1. cortisone
2. bile salt
3. adrenaline
4. insulin
DNA and RNA are chiral molecule due to the presence of
1. Chiral bases
2. phosphate ester unit
3. D-sugar component
4. L-sugar component
Assertion: A solution of sucrose in water is dextrorotatory.But on hydrolysis in the presence e of a little hydrochloric acid , it becomes laevorotatory.

Reason:Sucrose on hydrolysis gives unequal amounts of glucose and fructose .As a result of this, change in sign of rotation is observed.
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Assertion:Haemoglobin is an oxygen carrier .

Reason: Oxygen binds as $O_{2}$ to Fe of haemoglobin
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Assertion:Carboxypeptidase is an exopeptidase

Reason: It cleaves the N-terminal bond.
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Assertion:Sucrose is a non- reducing sugar .

Reason: It has glycosidic linkage
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Assertion: Maltose is areducing sugar which gives two moles of D-glucose on hydrolysis .

Reason:Maltose has a $1, 4 - β -$ glycosdic linkage.
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Assertion:Glucose reacts with phenyl hydrazine and Fehling's solution but not with $N a H S O_{3}$ .

Reason :the ring structure annot break $N a H S O_{3}$
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Assertion : Cellulose is not digested by human beings.

Reason: Cellulose is a polymer of $α$ -D-glucose .
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Assertion:Honey mainly contains invert sugar .

Reason: Bees supply the enzyme invertase .
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Assertion:Viatmin C cannot stored in our body .

Reason: Viatmin C is a water soluble viatmin.
1. If both assertion and the reason are true and the reason is correct explanation of the assertion
2. If both assertion and reason are true but reason is not the correct explanation of the assertion
3. If assertion is true but reason is false
4. If assertion is false but reason is true
Which one of the following biomolecukes is insoluble in water ? (AIPMT/NEET 2002)
1. $α$ - keartin
2. haemoglobin
3. ribonuclease
4. adenine
Subunits present in haemoglobin are (AIPMT/NEET 2003)
1. 2
2. 3
3. 4
4. 5
The helical structure or a secondary structure of proteins is stabilized by: (AIPMT/NEET 2003)
1. peptide bonds
2. dipeptide bonds
3. H-bonds
4. ether bonds
The pair in which both species have iron is (AIPMT/NEET 2003)
1. nitrogenase ,cytochromes
2. Carboxypeptidase,haemoglobin
3. haemocyanin,nitrogenase
4. haemoglobin,cytochromes
The enzyme which hydrolyses triglycerides to fatty acids and glycerol is : (AIPMT/NEET 2004)
1. maltase
2. lipase
3. zymase
4. pepsis
Number of chiral carbons in $β$ - D-(+) glucose is (AIPMT/NEET 2004)
1. 5
2. 6
3. 3
4. 4
A sequence of how many nucleotide in messenger RNA makes a codon for amino acid ? (AIPMT/NEET 2004)
1. 3
2. 4
3. 1
4. 2
The correct statement in respect of protein haemoglobin is :(AIPMT/NEET 2004)
1. Functions as catalyst for biological reaction
2. Acts as an oxygen carrier in blood
3. Maintains sugar level
4. Forms antibodies and offers resistance of disease
The hormone that helps in conversion of glucose to gycogen is : (AIPMT/NEET 2004)
1. cortisone
2. bile salt
3. adrenaline
4. insulin
Thymine is : (AIPMT/NEET 2005)
1. 5-methyluracil
2. 4-methyluracil
3. 3-methyluracil
4. 1-methyluracil
Cell membranes are mainly composed of : (AIPMT/NEET 2005)
1. phospholipids
2. fats
3. proteins
4. carbohydrates
Which functional group participates in disulphide bond formation in protein? (AIPMT/NEET 2005)
1. Thioether
2. Thiol
3. Thiolacetone
4. Thioester
Methyl- $α$ -D- glucoside and methyl- $β$ - glucoside are (AIPMT/NEET 2006)
1. epimers
2. anomers
3. enantiomers
4. Confimational diastereomers
Which one of the following is a peptide hormone ?(AIPMT/NEET 2006)
1. Adrenaline
2. Thyroxine
3. Glucogen
4. Testosterone
During the process of digestio, the proteins present in food materials are hydrolysd to amino acids .The two enzymes involved in the process
$P r o t e i n s \overset{E n z y m e A}{\to} P o l y p e t i d e s \overset{E n z y m e B}{\to} A m i n o a c i d s a r e r e s p e c t i v e l y e$ (AIPMT/NEET 2006)
1. Pepsin and trypsin
2. invertase and zymase
3. amylase and maltase
4. diastatse and lipase
The human body does not produce (AIPMT/NEET 2006)
1. hormones
2. enzymes
3. DNA
4. vitamins
The viatmin which is water soluble ?(AIPMT/NEET 2007)
1. Vitamin E
2. Vitamin D
3. Viatmin K
4. Vitamin B
DNA and RNA are chiral molecules due to the presence of :(AIPMT/NEET 2004)
1. chiral bases
2. phosphate sugar
3. D-sugar component
4. L-sugar component
In DNA , the complimentary bases are: (AIPMT/NEEt 2008)
1. Adenine and thymine ,guanine and uracil
2. adenine and guanine , thymine and cytosine
3. uracil and adenine , cytosine and guanine
4. adenine and thymine , guanine and cytosine
Which of the following hormones contains iodine (AIPMT/NEET 2009)
1. insulin
2. thyroxine
3. testosterome
4. adrenaline
The segment of DNA which acts as the instrumental manual for the synthesis of the protein is (AIPMT/NEET 2009)
1. nucleoside
2. nucleotide
3. ribose
4. gene
Fructose reduces Tollens reagent due to (AIPMT/NEET 2010)
1. asymmetric carbons
2. primary alcoholic group
3. secondary alcoholic group
4. enolisation of fructose followed by conversion to aldehyde by base
Which one of the following does not exhibit the phenomenon of mutarotaion ?(AIPMT/NEET 2010)
1. (+) Sucrose
2. (+) Lactose
3. (+)Maltose
4. (-) Fructose
Find the hydrolysis product of maltose (AIPMT/NEET 2011)
1. $α$ -D-glucose + $α$ -D-glucose
2. $α$ -D-glucose + $α$ - D -fructose
3. $α$ -D-glucose + $α$ - D- galactose
4. $α$ -D-fructose + $α$ -D- galactose
Which one of thr following statements is not true regarding(+) Lactose ? (AIPMT/NEET 2011)
1. (+) Lactose , $C_{12} H_{11} O_{11}$ contains 8-OH groups
2. On hydrolysis (+) Lactose gives equal amonut of D(+) glucose and D(+) galactose
3. (+) Lactose is a $β$ -glucoside formed by the union of a molecule of D(+) glucose and molecule of D(+) galactose
4. (+) Lactose is reducinf sugar and does not exhibit mutaroatation.
Deficiency of vitamin $B_{1}$ causes the disease : (AIPMT/NEET 2012)
1. Cheilosis
2. Sterility
3. Convulsions
4. Beri-Beri
Which one of the following sets of monosaccharides forms sucrose ? (AIPMT/NEET 2012)
1. $β$ -D- Glucopyranose and $α$ -D- fructouranose
2. $α$ -D-Glucopyranose and $β$ -D-fructopyranose
3. $α$ -D-Galactopyranose and $α$ -D-Glucopyranose
4. $α$ -D-Glucopyranose and $β$ -D-fructofuranose
Which one of the following hormones is produced under the conditions of stress which stimulate glycogenolysis in the liver of human beings ?(AIPMT/NEET2014)
1. Thyroxin
2. Insulin
3. Adrenaline
4. Estradiol
The function of "sodium pump" is a biological process opertaing in each and every cell of all animals .Which of the following biologically important ions is also a constant of this pump? (AIPMT/NEET 2015)
1. $K^{+}$
2. $F e^{2 +}$
3. $C a^{2 +}$
4. $M g^{2 +}$
In a protein molecule various amino acids are linked together by: (AIPMT/NEET 2016 phase 1)
1. dative bond
2. $α$ -glycosidic bond
3. $β$ - glycosidic bond
4. peptide bond
Which one given below is a non- reducing sugar ? (AIPMT/NEET 2016phase _1)
1. Sucrose
2. Maltose
3. Lactose
4. Glucose
The correct statement regarding RNA and DNA , respectively is (AIPMT/NEET 2016 phase 1)
1. The sugar component in RNA is $2^{'}$ - deoxyribose and the sugar component in DNA is arabinose
2. The sugar component in RNA is arabinose and the sugar component in DNA is $2^{'}$ - deoxyribose
3. The suagr component in RNA is ribose and the sugar componet in DNA is $2^{'}$ - deoxyribose
4. The suagr componet in RNA is arabinose and the sugar component in DNA is ribose
Enzymes with two sites are called (AIIMS 2002)
1. apoenzyme
2. allosteric enzyme
3. holoenzyme
4. cinjugate enzyme
Subunits present in haemoglobin are (AIIMS 2003)
1. 2
2. 3
3. 4
4. 5
Which one of the following biomolecules is insoluble in water ? (AIIMS 2005)
1. $α$ -keratin
2. Haemoglobin
3. Ribonuclease
4. Adenine
Which one of the following statements is true for protein synthesis (translation) ?(AIIMS 2005)
1. Amino acids are directly recognized by m-RNA
2. the third base of the codon is less specific
3. Only one codon codes for an amino acid
4. Every t-RNA molecule has more than one amino acid attachment
The pair in which both species have iron is (AIIMS 2006)
1. nitrogenase,cytochromes
2. carboxypeptidase ,haemoglobin
3. haemocyanin,nitogenase
4. haemoglobin,cytochromes
Thymine is (AIIMS 2006)
1. 5-methyluracil
2. 4-methyluracil
3. 3-methyluracil
4. 1-methyluracil
Lysine is least soluble in water in the pH range (AIIMS 2006)
1. 3 to 4
2. 5 to 6
3. 6 to 7
4. 8 to 9
Find the hydrolysis product when a phosphodiester bond of nucleotide breaks (AIIMS 2011)
1. 3-OH-deoxyribose -5- $P O_{4}^{3 -}$
2. 5-OH-deoxyribose -3- $P O_{4}^{3 -}$
3. 2-OH-deoxyribose -2- $P O_{4}^{3 -}$
4. 4-OH-deoxyribose -2- $P O_{4}^{3 -}$
FInd the hydrolysis product of maltose (AIIMS 2011)
1. $α$ -D-glucose + $α$ -D-glucose
2. $α$ -D-glucose + $α$ -D-fructose
3. $α$ -D-glucose + $α$ -D-galactose
4. $α$ -D-fructose + $α$ -D-galactose
Which of the following is a non-reducing sugar ? (AIIMS 2013)
1. Sucrose
2. Maltose
3. Lactose
4. Mannose
D (+) glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be [AIMPT/NEET 2014]
Among the following, L-serine is [AIIMS 2006]