Which statements about the modification of chromatin structure in eukaryotes are true?
select all that apply.
1. some forms of chromatin modification can be passed on to future generations of cells.
2. deacetylation of histone tails in chromatin loosens the association between nucleosomes and dna.
3. methylation of histone tails in chromatin can promote condensation of the chromatin.
4. acetylation of histone tails in chromatin allows access to dna for transcription.
5. acetylation of histone tails is a reversible process.
6. dna is not transcribed when chromatin is packaged tightly in a condensed form.

The empty trna moves off and picks up another matching amino acid from the cytoplasm in the cell. the anticodon of the trna, with its attached amino acid, pairs to the codon of the mrna, which is attached to a ribosome. this sequence is repeated until the ribosome reaches a stop codon on the mrna, which signals the end of protein synthesis. the ribosome forms a peptide bond between the amino acids, and an amino acid chain begins to form. when a second trna with its specific amino acid pairs to the next codon in sequence, the attached amino acid breaks from the first trna and is bonded to the amino acid of the second trna.