Multiple Choice QuestionsA sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?
Three
Four
One
Two
Which functional group participates in disulphide bond formation in proteins ?
Thiolacetone
Thiol
Thioether
Thioester
The safest and the most commone alternative of sugar is
glucose
aspartame
saccharin
cyclodextrin
The enzymes which are used to convert starch into ethyl alcohol are :
maltase, diastase
diastase, maltase, zymase
invertase, zymase
invertase, diastase, maltase
A Zwitter ion is
a negatively charged ion without metal atom
a heavy ion with a small charge on it
an ion with positive and negative charge at different points on it
a positively charged ion without a metal atom
Which of the following classes of compounds do glucose and fructose represent?
Aldoses and ketoses, respectively
Polyols
Monosaccharides
All of these
D.
All of these
Glucose and fructose both are monosaccharides, which are polyhydroxy (or polyols) aldehydes or polyhydroxy ketones. Glucose is an aldose sugar because it has one aldehydic group in its structure whereas fructose is ketose sugar, since it contains one keto group.
D(+)-glucose D(-)- fructose
The two forms of D-glucopyranose obtained from the solution of D-glucose are called
enantomer
epimer
anomer
isomer
A solution of D-glucose in water rotates the plane of polarised light
to the left
to the right
to either side
None of these
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