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NEET Chemistry > Biomolecules > Flashcards

Biomolecules Flashcards

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1
Q

Addison’s disease is due to hyposecretion of:

A

adrenal cortex

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2
Q

Sugar type in DNA and RNA?

A

beta-D-2-deoxyribose & beta-D-ribose

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3
Q

Which vitamin is ascorbic acid?

A

C

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4
Q

Which vitamin is pyridoxine?

A

B6

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5
Q

Which vitamin is riboflavin?

A

B2

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6
Q

Which vitamine is thiamine?

A

B1

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7
Q

List the 10 essential amino acids

A

Valine, leucine, isoleucine, arginine, lysine, threonine, methionine, phenylalanine, tryptophane, histidine

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8
Q

__ is named since it has sweet taste
__ was first obtained from cheese

A

glycine
tyrosine

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9
Q

Only __ are obtained on hydrolysis of proteins

A

Alpha amino acids

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10
Q

Linkage in lactose

A

beta-1,4-linkage

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11
Q

Lactose is composed of

A

beta-D-galactose, beta-D-glucose

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12
Q

Linkage in maltose

A

alpha-1,4-linkage

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13
Q

Maltose is composed of

A

2 alpha-D-glucose

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14
Q

Why is sucrose called invert sugar?

A

Mixture of glucose and fructose is laevo due to dominant laevo character of fructose. Sucrose has a dextro character.

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15
Q

Sucrose has which linkage?

A

1,2 linkage

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16
Q

Sucrose is composed of:

A

alpha-D-glucose, beta-D-fructose

17
Q

alpha and beta forms are called:

A

anomers

18
Q

How are alpha and beta forms of glucose obtained?

A

alpha - crystallisation from concentrated solution of glucose at 303K
beta - crystallisation from hot and saturated aqueous solution at 371K

19
Q

Meaning of D(+)-glucose

A

D - configuration
(+)- dextrorotatory

20
Q

gluconic acid with nitric acid produces

A

saccharic acid (dicarboxyl)

21
Q

glucose with acetic anhydride produces

A

glucose pentaacetate

22
Q

glucose with Br2 water produces

A

gluconic acid

23
Q

glucose with HCN produces

A

cyanohydrin

24
Q

glucose with hydroxylamine produces

A

oxime

25
Q

Glucose with HI produces:

A

n-hexane

26
Q

Commercially glucose is obtained by-

A

hydrolysis of starch by boiling with dilute H2SO4 at 393K under pressure.

27
Q

If sucrose is boiled with __ or __ in __ solution, __ & __ are obtained in equal amounts

A

dilute HCl/H2SO4 in alcoholic solution, glucose & fructose

28
Q

Most fruits have fructose but __ has glucose

A

Ripe grapes

29
Q

__ is not a carb but fits the general formula.
And __ is a carb but does not fit the general formula.

A

Acetic acid (CH3COOH)
Rhamnose (C6H12O5)

NEET Chemistry (4 decks)

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