Biomolecules Flashcards
Addison’s disease is due to hyposecretion of:
adrenal cortex
Sugar type in DNA and RNA?
beta-D-2-deoxyribose & beta-D-ribose
Which vitamin is ascorbic acid?
C
Which vitamin is pyridoxine?
B6
Which vitamin is riboflavin?
B2
Which vitamine is thiamine?
B1
List the 10 essential amino acids
Valine, leucine, isoleucine, arginine, lysine, threonine, methionine, phenylalanine, tryptophane, histidine
__ is named since it has sweet taste
__ was first obtained from cheese
glycine
tyrosine
Only __ are obtained on hydrolysis of proteins
Alpha amino acids
Linkage in lactose
beta-1,4-linkage
Lactose is composed of
beta-D-galactose, beta-D-glucose
Linkage in maltose
alpha-1,4-linkage
Maltose is composed of
2 alpha-D-glucose
Why is sucrose called invert sugar?
Mixture of glucose and fructose is laevo due to dominant laevo character of fructose. Sucrose has a dextro character.
Sucrose has which linkage?
1,2 linkage
Sucrose is composed of:
alpha-D-glucose, beta-D-fructose
alpha and beta forms are called:
anomers
How are alpha and beta forms of glucose obtained?
alpha - crystallisation from concentrated solution of glucose at 303K
beta - crystallisation from hot and saturated aqueous solution at 371K
Meaning of D(+)-glucose
D - configuration
(+)- dextrorotatory
gluconic acid with nitric acid produces
saccharic acid (dicarboxyl)
glucose with acetic anhydride produces
glucose pentaacetate
glucose with Br2 water produces
gluconic acid
glucose with HCN produces
cyanohydrin
glucose with hydroxylamine produces
oxime
