OBJECTIVE LIFE SCIENCE
DIVERSITY AMONG LIFE FORMS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
amino
|
|
|
sulfhydryl
|
|
|
phosphate
|
|
|
methyl
|
Detailed explanation-1: -DNA methylation involves the attachment of small chemical groups called methyl groups (each consisting of one carbon atom and three hydrogen atoms) to DNA building blocks. When methyl groups are present on a gene, that gene is turned off or silenced, and no protein is produced from that gene.
Detailed explanation-2: -Methyl groups (1-carbon units) for the methylation of DNA are donated by S-adenosylmethionine (SAM) in the reaction catalyzed by the DNA methyltransferases (DNMTs).
Detailed explanation-3: -A methyl group is a molecule that contains one carbon atom surrounded by three hydrogen atoms; it belongs to an organic family called the alkyl group. The alkyl group is a type of functional group where all the members contain carbon and hydrogen atoms.