1
Bio 103
Bio 103 (Quiz 7 Content) Exam Questions with
Correct Verified Answers Latest Update
(2025/2026) Guaranteed Pass
1. What is the role of histone acetylation in transcription?:
modification of histones by adding acetyl groups to lysine (K)
2. Result of histone acetylation:: Relaxes chromatin structure,
Increasing DNA template availability for transcription
3. Histones also modified by:: -Methylation (at Lys [K] & aRg)
-Phosphorylation (at Ser), &
-addition of small peptides (ubiquitin and SUMO) to K residues
4. What amino acid residues on histones are commonly modified
by methylation?: Lysine (K) and Arginine (R) residues
5. What amino acid residue is typically modified by
phosphorylation on histones?: Serine (S)
6. What small peptides can be added to lysine residues on
histones?: Ubiquitin and SUMO (Small Ubiquitin-like Modifier)
Bio 103
,7. What is the "histone code"?: Affects gene expression by altering
chromatin properties
Provides binding sites for proteins to activate or repress transcription
8. What is the role of chromatin remodeling factors in
transcription initiation?: recruited with transcriptional activator
to displace nucleosome from promoter sequence where
transcription factors and RNA Pol will bind
9. What is epigenetic inheritance?: transmission of information NOT
contained within DNA sequence
10. When is epigenetic information transferred?: Transferred to
daughter cells at cell division
Sometimes can be inherited across generations
18 What happens to parental nucleosomes during DNA replication?:
Parental nucleosomes are distributed equally among daughter DNA
strands during replication.
, 19. How are newly synthesized nucleosomes modified during
replication?: Newly synthesized nucleosomes incorporate modified
histones, and their modifications are directed by parental nucleosomes.
20. What is epigenetics?: Epigenetics is the transfer of information
not contained within the DNA sequence, influencing gene expression and
cell function.
21. How is epigenetic information transferred to daughter cells?:
Epigenetic information is transferred via parental modified histones that
are passed on to daughter cells during cell division.
22. What is the function of Polycomb Repressive Complex 2
(PRC2)?: Polycomb Repressive Complex (PRC) 2 mediates epigenetic
inheritance of histone H3K27me3, leading to transcriptional repression.
23. What does the histone modification H3K27me3 indicate?:
H3K27me3 is a repressive mark on histone H3, associated with
transcriptional silencing and gene repression.
24. How is H3K27me3 involved in epigenetic inheritance?: The
H3K27me3 mark is maintained during DNA replication, allowing the
Bio 103
Bio 103 (Quiz 7 Content) Exam Questions with
Correct Verified Answers Latest Update
(2025/2026) Guaranteed Pass
1. What is the role of histone acetylation in transcription?:
modification of histones by adding acetyl groups to lysine (K)
2. Result of histone acetylation:: Relaxes chromatin structure,
Increasing DNA template availability for transcription
3. Histones also modified by:: -Methylation (at Lys [K] & aRg)
-Phosphorylation (at Ser), &
-addition of small peptides (ubiquitin and SUMO) to K residues
4. What amino acid residues on histones are commonly modified
by methylation?: Lysine (K) and Arginine (R) residues
5. What amino acid residue is typically modified by
phosphorylation on histones?: Serine (S)
6. What small peptides can be added to lysine residues on
histones?: Ubiquitin and SUMO (Small Ubiquitin-like Modifier)
Bio 103
,7. What is the "histone code"?: Affects gene expression by altering
chromatin properties
Provides binding sites for proteins to activate or repress transcription
8. What is the role of chromatin remodeling factors in
transcription initiation?: recruited with transcriptional activator
to displace nucleosome from promoter sequence where
transcription factors and RNA Pol will bind
9. What is epigenetic inheritance?: transmission of information NOT
contained within DNA sequence
10. When is epigenetic information transferred?: Transferred to
daughter cells at cell division
Sometimes can be inherited across generations
18 What happens to parental nucleosomes during DNA replication?:
Parental nucleosomes are distributed equally among daughter DNA
strands during replication.
, 19. How are newly synthesized nucleosomes modified during
replication?: Newly synthesized nucleosomes incorporate modified
histones, and their modifications are directed by parental nucleosomes.
20. What is epigenetics?: Epigenetics is the transfer of information
not contained within the DNA sequence, influencing gene expression and
cell function.
21. How is epigenetic information transferred to daughter cells?:
Epigenetic information is transferred via parental modified histones that
are passed on to daughter cells during cell division.
22. What is the function of Polycomb Repressive Complex 2
(PRC2)?: Polycomb Repressive Complex (PRC) 2 mediates epigenetic
inheritance of histone H3K27me3, leading to transcriptional repression.
23. What does the histone modification H3K27me3 indicate?:
H3K27me3 is a repressive mark on histone H3, associated with
transcriptional silencing and gene repression.
24. How is H3K27me3 involved in epigenetic inheritance?: The
H3K27me3 mark is maintained during DNA replication, allowing the
