Chemistry - Study Mode

[#681] The metal present in vitamin B 12 is
Correct Answer

(B) Co

Explanation

Solution: Vitamin B 12 is also referred to as cobalamin, because it contains a metal ion (cobalt).

[#682] Which of the following is not present in RNA
Correct Answer

(A) Thymine

Explanation

Solution: Thymine base is not present in RNA. In RNA, uracil is found in place of thymine.

[#683] The enzyme that converts glucose to ethyl alcohol is :
Correct Answer

(C) Zymase

Explanation

Solution: The fermentation of sugar into ethanol is one of the earliest biotechnologies employed by humanity. Fermentation of fermentable sugars by suitable yeast produces ethanol (ethyl alcohol). Yeast is a single celled fungus containing a number of enzymes useful during fermentation. Brewers yeast and wine yeast, for example, contain zymase, an enzyme that can convert glucose to ethanol.

[#684] The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
Correct Answer

(D) Dihydroxy phenyl alanine

Explanation

Solution: The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection.

[#685] During fermentation of sugar, the compound which is always formed is :
Correct Answer

(B) Ethyl Alcohol

Explanation

Solution: Fermentation is the conversion of sugar into carbon dioxide gas (CO2) and ethyl alcohol. This process is carried out by yeast cells using a range of enzymes.