Examlex
Indicate whether each of the following histone modifications is generally associated with active genes (A) or silenced genes (S). Your answer would be a four-letter string composed of letters A and S only, e.g. SSAS.
( ) H3 lysine 9 acetylation
( ) H3 serine 10 phosphorylation
( ) H3 lysine 4 trimethylation
( ) H3 lysine 9 trimethylation
Molecular Formula
A notation showing the types and numbers of atoms in a molecule without providing information on the arrangement or bonds between them.
Elements of Unsaturation
Indicators of the presence of double bonds, triple bonds, or rings in a molecule, which affect its hydrogen-to-carbon ratio.
Molecular Formula
A notation that shows the type and quantity of atoms in a molecule but not the bonds or arrangement.
Ring Structures
Circular arrangements of atoms within molecules that are especially common in organic chemistry.
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