12th Standard Syllabus & Materials
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Published on: 13/10/2020
12th Standard Chemistry Biomolecules English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
An example of non-protein amino acid is
Alanine
orinithine
proline
serine
2.
On hydrolysis, which one of the following disaccharide will give a ketose and an aldose?
Maltose
Sucrose
Lactose
All the above
3.
An example for reducing disaccharide is
glucose
fructose
sucrose
lactose
4.
Fructose is not oxidised by bromine water indicates
the presence of aldehydic group
presence of ketonic group
absence of aldehydic group
absence of ketonic group
5.
Sugars that yield two to ten monosaccharide molecules on hydrolysis is
monosaccharides
disaccharides
oligosaccharides
polysaccharides
6.
The oxide bridges through which a large number of monosaccharide units are linked in polysaccharides are called
peptide bond
hydrogen bond
nitrogen bond
glycosidic linkage
7.
Hair and nail contains
cellulose
fat
keratin
lipid
8.
Ultimate products of hydrolysis of proteins is
aniline
aliphatic acid
amino acid
aromatic acid
9.
Which is not true of amino acid?
amino acid forms zwitter ion
has isoelectric point
dual behaviours
amino acid is insoluble in NaOH solution
10.
Glucose is not oxidised to gluconic acid by
Br2/H2O
Fehling's solution
Tollen's reagent
Conc.HNO3
11.
Sucrose is not
a di-saccharide
a non-reducing sugar
hydrolysed to only glucose
hydrolysed to glucose & fructose
12.
Disaccharides have general formula
Cn(H2O)n
(CO2)n n,
Cn(H2O)n-1
Cn(H2O)2n-l
13.
Which of the following are epimers?
D(+)-Glucose and D(+)-Galactose
D(+)-Glucose and D(+)-Mannose
Neither (a) nor (b)
Both (a) and (b)
14.
Insulin, a hormone chemically is ______.
Fat
Steroid
Protein
Carbohydrates
15.
Complete hydrolysis of cellulose gives ______.
L-Glucose
D-Fructose
D-Ribose
D-Glucose
16.
The pyrimidine bases present in DNA are ______.
Cytosine and Adenine
Cytosine and Guanine
Cytosine and Thiamine
Cytosine and Uracil
17.
In aqueous solution of amino acids mostly exists in ______.
NH2-CH(R)-COOH
NH2-CH(R)-COO-
H3N+-CH(R)-COOH
H3N+-CH(R)-COO-
18.
Among the following the achiral amino acid is ______.
2-ethylalanine
2-methylglycine
2-hydroxymethylserine
Tryptophan
19.
\(\text { Glucose } \stackrel{(\mathrm{HCN})}{\longrightarrow} \text { Product } \stackrel{(\text { hydrolysis })}{\longrightarrow} \text { Product } \stackrel{(\mathrm{HI}+\text { Heat })}{\longrightarrow} \mathrm{A}\) , the compound A is______.
Heptanoic acid
2-Iodohexane
Heptane
Heptanol
20.
The correct corresponding order of names of four aldoses with configuration given below Respectively is ______.
L-Erythrose, L-Threose, L-Erythrose, D-Threose
D-Threose, D-Erythrose, L-Threose, L-Erythrose,
L-Erythrose, L-Threose, D-Erythrose, D-Threose
D-Erythrose, D-Threose, L-Erythrose, L-Threose
1.
(b)
orinithine
2.
(b)
Sucrose
3.
(d)
lactose
4.
(c)
absence of aldehydic group
5.
(c)
oligosaccharides
6.
(d)
glycosidic linkage
7.
(c)
keratin
8.
(c)
amino acid
9.
(d)
amino acid is insoluble in NaOH solution
10.
(d)
Conc.HNO3
11.
(c)
hydrolysed to only glucose
12.
(c)
Cn(H2O)n-1
13.
(d)
Both (a) and (b)
14.
(c)
Protein
15.
(d)
D-Glucose
16.
(c)
Cytosine and Thiamine
17.
(d)
H3N+-CH(R)-COO-
18.
(c)
2-hydroxymethylserine
19.
(a)
Heptanoic acid
20.
(d)
D-Erythrose, D-Threose, L-Erythrose, L-Threose
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