IISER Chemistry - Bio-Molecules : Structure and functions and chemistry of some biological Process
Exam Duration: 45 Mins Total Questions : 30
Glucose can be converted to fructose through
- (a)
phenyl hydrazone formation
- (b)
oxime formation
- (c)
osazone formation, subsequent hydrolysis and reduction
- (d)
NONE OF THE ABOVE
In the stomach proteins are hydrolysed by the operation of enzyme pepsin and H+ to yield
- (a)
polypeptides
- (b)
peptones
- (c)
proteoses
- (d)
\(\quad \alpha -aminoacids\)
peptones
Which one of the following foods have a maximum calorific value for one gram of the material?
- (a)
fats
- (b)
oils
- (c)
proteins
- (d)
carbohydrates
oils.
Which one of the following elements is required for the formation of bones and cartilages?
- (a)
iron
- (b)
calcium
- (c)
iodine
- (d)
cobalt
calcium
Xerosis disease is
- (a)
an eye disease
- (b)
a skin disease
- (c)
a liver disease
- (d)
a lund disease
xerosis \(\rightarrow \) in which skin begins to dry.
Vitamin B1 is also known as
- (a)
riboflavin
- (b)
cobalamin
- (c)
thiamine
- (d)
pepsin
Thiamine is found in milk, yeast, egg, polished rice and vegetables.
Vitamin B6 is a mixture of
- (a)
pyridoxal and pyridoxine
- (b)
pyridoxal and pyridoxomine
- (c)
pyridoxal, pyridoxal and pyridoxomine
- (d)
NONE OF THE ABOVE
pyridoxal, pyridoxine and pyridoxomine.
Deficiency of vitamin B6 causes
- (a)
general nervousness
- (b)
burnind of eyes
- (c)
scurvy
- (d)
skin diseases
General nervousness.
Insulin is used in the treatment of
- (a)
anaemia
- (b)
breast cancer
- (c)
lung cancer
- (d)
diabets
Diabetees
Deficiency of vitamin D causes
- (a)
anaemia
- (b)
breast cancer
- (c)
lung cancer
- (d)
rickets
Rickets.
Antirachitic vitamin is also known as
- (a)
A
- (b)
B Complex
- (c)
C
- (d)
D
D.its deficiency causes rickets.
The digestive fat splitting enzymes are known as
- (a)
lipases
- (b)
esteroses
- (c)
deaminases
- (d)
proteolytic enzymes
Lipases
The structure of a peptide is \({ H }_{ 2 }N-CONH\underset { \overset { | }{ CH } }{ CH } \quad CONH\quad \underset { \overset { | }{ { \left( { CH }_{ 3 } \right) }_{ 2 } } }{ CH } \) the Name of the peptide is
- (a)
glycyl alanyl valine
- (b)
glycyl valyl alanine
- (c)
alonyl valyl glycine
- (d)
valyl alanyl glycine
Glycylalanyl valine.
Pick out the wrong combination:
- (a)
\(Mg^{ 2+ }\rightarrow \quad photosynthesis\\ \)
- (b)
\(Fe^{ 2+ }\rightarrow \quad Heamoglobin\\ \)
- (c)
\(Se^{ 2+ }\rightarrow \quad Kreb's\quad cycle\\ \)
- (d)
\(CO^{ 2+ }\rightarrow \quad Vitamin\quad B_{ 12 }\\ \)
Which one of the following is not present in RNA?
- (a)
uracil
- (b)
thymine
- (c)
ribose
- (d)
phosphate
Which of the following is not normally a use of protein in the body?
- (a)
for fingernails and hair
- (b)
for skin
- (c)
for skeletal muscles
- (d)
for energy for metabolism
A carbohydrate which cannot be hydrolysed to simpler compounds is called
- (a)
monosaccharide
- (b)
disaccharide
- (c)
trisaccharide
- (d)
polysaccharide
Monosaccharide is the simplest carbohydrate which cannot be hydrolyse to simpler compounds.
Ripe graphs contain
- (a)
glucose
- (b)
fructose
- (c)
sucrose
- (d)
maltose
Ripe graphs contain mainly glucose.
Which of the following is the sweetest sugar?
- (a)
Glucose
- (b)
Fructose
- (c)
Maltose
- (d)
Sucrose
Fructose is the sweetest sugar.
Which is not a hexose?
- (a)
GlucoseRibose
- (b)
Fructose
- (c)
Ribose
- (d)
Galactose
Ribose, C5 H10 O5 is not a hexose.
Select non-essential amino acid.
- (a)
Tryptophan
- (b)
Phenylalanine
- (c)
Lysine
- (d)
None of these
Lysine, tryptophan and phenylalanine are essential amino acids.
Example of denaturation is
- (a)
curding of milk by bacteria
- (b)
coagulation of egg white on boiling
- (c)
Both (a) and (b)
- (d)
None of the above
In both the given processes, denaturation of protein takes place.
Point odd one out among the following
- (a)
Pepsin
- (b)
Ptylin
- (c)
Lipase
- (d)
Cellulose
Cellulose is a carbohydrate, others are enzymes.
Which base is present in RNA but not in DNA?
- (a)
Uracil
- (b)
Cytosine
- (c)
Guanine
- (d)
Thymine
Uracil is present in RNA but not in DNA.
Glycogen is a branched chain polymer of \(\alpha -D\)-glucose units in which chain is formed by C1-C4 glycosidic linkage whereas branching occurs by the formation of C1-C6 glycosidic linkage. Structure of glycogen is similar to
- (a)
amylose
- (b)
amylopectin
- (c)
cellulose
- (d)
glucose
Structure of glycogen is similar to amylopectin.
Which of the following reactions of glucose can be explained by the cyclic structure?
- (a)
Glucose reacts with hydroxyl amine to form an oxime
- (b)
Glucose forms pentaacetate
- (c)
Pentaacetate of glucose does not react with hydroxyl amine
- (d)
Glucose is oxidised by nitric acid to gluconic acid
Pentaacetate of glucose does not react with hydroxyl amine, it indicates that glucose has cyclic structure.
Synthesis of each molecule of glucose in photosynthesis involves
- (a)
18 molecules of ATP
- (b)
10 molecules of ATP
- (c)
8 molecules of ATP
- (d)
6 molecules of ATP
\({ 6{ CO }_{ 2 }+12NADPH+18ATP\rightarrow }{ C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }+12NADP+18ATP\)
Which of the following compounds can be detected by Molisch's test?
- (a)
Nitro compounds
- (b)
Sugars
- (c)
Amines
- (d)
Primary alcohols
Molish's test is for carbohydrates (e.g., sugar). Add two drops of alcoholic solution of \(\alpha \) - naphthol to the carbohydrates solution under study. Add conc. H2SO4 slowly by the side of the test tube. A violet ring is formed at the junction of two liquids if carbohydrate is present.
Biuret test is not given by
- (a)
carbohydrates
- (b)
polypeptides
- (c)
urea
- (d)
proteins
Biuret test is characteristically given by the compound having \(-\overset { \underset { || }{ O } }{ C } -NH-\) functional group.
The secondary structure of a protein refers to
- (a)
\(\alpha \)- helical backbone
- (b)
hydrophobic interactions
- (c)
sequence of \(\alpha \) - amino acids
- (d)
fixed configuration of the polypeptide backbone
Primary structure involves sequence of \(\alpha \) - amino acids polypeptide chain.
secondary structure involves \(\alpha \) - helical and \(\beta \) - pleated sheet like structures.
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