Part A If you want to affect chromatin packaging, which amino acid could you mutate to affect both histone acetylation and methylation patterns? If you want to affect chromatin packaging, which amino acid could you mutate to affect both histone acetylation and methylation patterns?

methionine
histidine
lysine
asparagine
arginine

Lysine

Explanation:

lysine residues on the histone tails of the octamer cn be activated by both acetylation and methylation patterns to influence accessibility or silencing of the genes respectiviely. for example, acetylation of H3K27 (histone 3 lysine residue 27) brings about a region of active chromatin allowing access to transcription activity while its trimethylation  will cause silencing of the associated gene at that particular area (no expression of that gene)

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.