What are the DNA repair functions and the modes of activity of glycosylases and methyltransferases?

What will be an ideal response?


Ans: Glycosylases recognize and remove uracil and alkylated bases. Methyltransferases add a methyl group to cytosines, leading to its removal from the nucleotide. Both of these types of enzymes work by "flipping" the base out of the double helix, putting it into a position that allows the active site of the enzyme to cleave the base.

Biology & Microbiology

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Treponema pallidum is extremely sensitive to temperature changes and low moisture, thus it is transmitted

A) by intimate person-to-person contact. B) by fomites. C) by vectors. D) through common sources such as food and water.

Biology & Microbiology

Which immunoglobulin is the most common in gland secretions?

a. IgG b. IgA c. IgD d. IgM e. IgE

Biology & Microbiology

Which of the three modes of selection would be most likely to result in speciation? Why?

What will be an ideal response?

Biology & Microbiology

Women with X-linked disorder always pass the genes for the disorder to ________________, while men with X-linked disorder always pass the genes for the disorder to___________ .

A. only their daughters; only their daughters B. both their daughters and sons; only their sons C. both their daughters and sons; only their daughters D. both their daughters and sons; their daughters and sons

Biology & Microbiology