DNA Packaging and Chromatin Formation Quiz

What is the difference between a supercoiled and a relaxed DNA molecule?

• Supercoiled DNA has a linear structure while relaxed DNA is circular

• Supercoiled DNA has a lower level of compaction than relaxed DNA

• Supercoiled DNA has no compaction while relaxed DNA is highly compacted

• Supercoiled DNA has a higher level of compaction than relaxed DNA

• Supercoiled DNA has a similar level of compaction as relaxed DNA

Why is supercoiling of DNA molecules important?

• It allows for easier replication of DNA

• It has no significant importance

• It maintains the stability of DNA structure

• It prevents DNA damage

• It helps in the regulation of gene expression

How does DNA packaging in eukaryotes compare and contrast with that in prokaryotes?

• Prokaryotes have a more complex chromatin structure than eukaryotes

• Prokaryotes have a simpler chromatin structure than eukaryotes

• Eukaryotes have histones while prokaryotes do not

• Prokaryotes have more condensed DNA than eukaryotes

• Eukaryotes have more condensed DNA than prokaryotes

What is the structure of chromatin and histone proteins?

• Chromatin is composed of DNA, RNA, and proteins, while histones are made up of RNA

• Chromatin is composed of DNA and proteins, while histones are made up of RNA

• Chromatin is composed of RNA and proteins, while histones are made up of DNA

• Chromatin is composed of proteins and RNA, while histones are made up of DNA

• Chromatin is composed of DNA, proteins, and RNA, while histones are proteins

How do dsDNA and histones associate to form the nucleosome?

• Histones interact with the minor groove of DNA

• Histones bind to the phosphate groups of DNA

• Histones bind to the nitrogenous bases of DNA

• Histones bind to the hydrogen bonds of DNA

• Histones bind to the sugar-phosphate backbone of DNA

Describe the different structural conformations of DNA packaging in eukaryotes.

• 20 nm fiber, 30 nm fiber, and metaphase chromosomes

• 10 nm fiber, 20 nm fiber, and anaphase chromosomes

• 10 nm fiber, 30 nm fiber, and telophase chromosomes

• 20 nm fiber, 40 nm fiber, and telophase chromosomes

• 10 nm fiber, 30 nm fiber, and metaphase chromosomes

How can histone modification influence transcriptional activity?

• It can modulate gene expression positively or negatively

• It has no effect on transcriptional activity

• It only represses gene expression

• It can activate or repress gene expression

• It only activates gene expression

What are the functions of chromatin in eukaryote cells?

• To allow the genome to fit inside the nucleus and regulate gene expression

• To prevent DNA replication and transcription

• To regulate gene expression and protect DNA from damage

• To maintain the structure of chromosomes during interphase

• To package DNA into a smaller volume to fit in the cell

What are the two types of chromatin based on chromosome staining properties?

• Euchromatin and heterochromatin

• Prochromatin and metachromatin

• Dyschromatin and normochromatin

• Heterochromatin and normochromatin

• Ischromatin and parachromatin

What is the composition of the nucleosome core?

• H1, H2A, H2B, H3, H4, and H5 histone proteins

• H2A, H2B, H3, and H4 histone proteins

• H1, H2A, H2B, H3, and H4 histone proteins

• H2A, H2B, and H3 histone proteins

• H1, H2A, H2B, and H3 histone proteins