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NEET - Chemistry Biomolecules Practice Q & A

22745.RNA is different from DNA because RNA contains
ribose sugar and thymine
ribose sugar and uracil
deoxyribose sugar and thymine
deoxyribose sugar and uracil
22746.Which of the following amino acids is basic in nature?
Valine
Tyrosine
Arginine
Leucine
22747.One mole of stachyose on hydrolysis yields
1 mole of glucose + 1 mole of fructose + 2 mole of galactose
2 mole of glucose + 1 mole of fructose + 1 mole of galactose
1 mole of glucose + 2 mole of fructose + 1 mole of galactose
2 mole of glucose + 2 mole of fructose
22748.In DNA, the consecutive deoxynucleotides are connected via
phospho diester linkage
phospho monoester linkage
phospho triester linkage
amide linkage
22749.Which of the following polymer is stored in the liver of animals?
Amylose
Cellulose
Amylopectin
Glycogen
22750.Which of the following is correct about H–bonding in DNA?
A – T, G – C
A – G, T – C
G – T, A – C
A – A, T – T
22751.Which one of the following statements is correct?
All amino acids except lysine are optically active
All amino acids are optically active
All amino acids except glycine are optically active
All amino acids except glutamic acids are optically active
22752.Which of the following is not present in a nucleotide?
cytosine
guanine
adenine
tyrosine
22753.The statement that is NOT correct is
Aldose or ketose sugars in alkaline medium do not isomerise.
Carbohydrates are optically active.
Penta acetate of glucose does not react with hydroxylamine.
Lactose has glycosidic linkage between C-4 of glucose and C-1 of galactose unit.
22754.The number of amino acids and number of peptide bonds in a linear tetrapeptide (made of different amino acids) are respectively
4 and 4
5 and 5
5 and 4
4 and 3
22755.Biuret test is not given by
proteins
carbohydrates
polypeptides
urea
22756.Cheilosis and digestive disorders are due to the deficiency of
Thiamine
Ascorbic acid
Riboflavin
Pyridoxine
22757.Which one of the following matches between enzymes and reaction it catalyse is wrong?
Invertase – Hydrolysis of cane sugar
Maltase – Hydrolysis of maltose into glucose
Pepsin – Hydrolysis of proteins into peptides
Urease – Conversion of glucose into ethyl alcohol
22758.Which of the following is/are purine bases?
Guanine
Adenine
Thymine
Both Guanine and Adenine
22759.Which of the following terms are correct about enzyme?
(i) Proteins
(ii) Dinucleotides
(iii) Nucleic acids
(iv) Biocatalysts
(i) and (iv)
(i) and (ii)
(iii) and (iv)
(ii) and (iv)
22760.An example of a sulphur containing amino acid is
Lysine
Serine
Cysteine
Tyrosine
22761.During conversion of glucose into glucose cyanohydrin, what functional group/atom of glucose is replaced?
hydrogen
aldehydic group
primary alcoholic group
secondary alcoholic group
22762.A nucleoside on hydrolysis gives:
an aldopentose and a heterocyclic base.
an aldopentose and orthophosphoric acid.
a heterocyclic base and orthophosphoric acid.
an aldopentose, a heterocyclic base and orthophosphoric acid.
22763.The term anomers of glucose refers to
isomers of glucose that differ in configurations at carbons one and four (C–1 and C–4)
a mixture of (D)–glucose and (L)–glucose
enantiomers of glucose
isomers of glucose that differ in configuration at carbon one (C–1)
22764.Complete hydrolysis of cellulose gives
D–ribose
D–glucose
L–glucose
D–fructose
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