Which of the following food-stuffs contains nitrogen?
Carbohydrates
fats
Proteins
None of these
C.
Proteins
The general fomula for carbohydrates is Cx (H2O)y. Thus, carbohydrates do not have nitrogen. Proteins are polymers of amino acids and all amino acids contain NH2 group. Thus, nitrogen is present in proteins. Fats are triesters of glycerol, hence they also do not contain nitrogen.
The activation energy for a simple chemical reaction A → B is Ea in forward direction. They activation energy for reverse reaction
is negative of Ea
is always less than Ea
can be less than or more than Ea
is always double of Ea
Enzymes are made up of
edible proteins
proteins with specific structure
nitrogen contaning carbohydrates
carbohydrates
Which of the following statements about vitamin B12 is incorrect?
It has a cobalt atom.
It also occurs in plants.
It is also present in rain water.
It is needed for human body in very small amounts.
When a biochemical reaction is carried out in laboratory from outside of human body in the absence of enzyme than rate of reaction obtained is 10-6 times, then activation energy of reaction in the presence of enzyme is
6/RT
P is required
different from Ea obtained in laboratory
cannot say anything
