An organic methyl molecule attached to part of a dna strand has been identified as a(n) epigenetic mark. double helix. self-regulating gene. genome.

Epigenetic mark

Explanation:

A methyl group attached to the nitrogenous base of one amino acid on the DNA is known to have effects on the expression and transcripcion of the genes, and this is also called epigenetic modifications. Therefore, an methyl group attached to the DNA is responsible for epigenetic modifications and so is an epigenetic mark.

Correct  a₂ > a₁

Explanation:

Given:

Tony  mass = m₁ = 50 kg

Sam mass = m₂ = 45 kg

According to Newton's second law, the formula for calculating force is:

F = m · a

In this case we have the same force for both

F = m₁ a₁ = m₂ a₂  => a₁ / a₂ = m₂ / m₁ = 45 / 50 = 9 / 10 = 0.9

a₁ = 0.9 a₂  => a₁ = 90% of a₂ => a₂ > a₁

a₂ > a₁

God is with you!!!