Butyric acid also known as butanoic acid is found in milk and butter and is a product of anaerobic fermentation. It has an unpleasant smell and acid taste.
The cell membranes are mainly composed of phospholipids.
8.
Study the structures of $$\alpha {\text{ - }}D{\text{ - }}\left( + \right)$$ glucopyranose and $$\beta {\text{ - }}D{\text{ - }}\left( + \right)$$ glucopyranose and mark the correct statement.
A.
Structures I and II are enantiomers.
B.
Structures I and II are anomers.
C.
The two structures I and II differ in the configuration of $${C_1}$$ and $${C_4}.$$
D.
Both the structures I and II give 2, 4-$$DNP$$ test.
Such isomers i.e., $$\alpha $$ - form and $$\beta $$ - form which differ only in the configuration of the hydroxyl group at $$C - 1,$$ are called anomers.
The organic compounds other than carbohydrates, proteins which maintain normal growth and nutrition in the human body ( but not produced in human body ) are called vitamins.
10.
Maltose is made up of
A.
two $$\alpha {\text{ - }}D{\text{ - }}$$ glucose
B.
normal $$\beta {\text{ - }}D{\text{ - }}$$ glucose
C.
$$\alpha {\text{ - }}$$ and $$\beta {\text{ - }}D{\text{ - }}$$ glucose
D.
fructose
Answer :
two $$\alpha {\text{ - }}D{\text{ - }}$$ glucose
Maltose is composed of two $$\alpha {\text{ - }}D{\text{ - }}$$ glucose units in which $$C{\text{ - 1}}$$ of one glucose is linked to $$C{\text{ - 4}}$$ of another glucose unit.