Advertisements
Advertisements
Question
Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?
Advertisements
Solution
| Heterochromatin | Euchromatin |
| DNA is highly packed in the chromosome. | DNA is loosely packed in the chromosome. |
| It has a high density of DNA. | It has a low density of DNA. |
| It is only contained in Eukaryotes. | Prokaryotes and eukaryotes both contain euchromatin. |
APPEARS IN
RELATED QUESTIONS
How are the following formed and involved in DNA packaging in a nucleus of a cell?
(ii) Nucleosome
(iii) Chromatin
Write a note on the packaging of DNA in Eukaryotes.
The additional set of proteins required for packaging of chromatin at higher level are called ______.
Find out the wrong statement about heterochromatin.
Read the following and answer from given below:
In prokaryotes, DNA is circular and present in the cytoplasm but in eukaryotes, DNA is linear and mainly confined to the nucleus. DNA or deoxyribonucleic acid is a long polymer of nucleotides. In 1953, the first correct double-helical structure of DNA was worked out by Watson and Crick. Based on the X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin. It is composed of three components, i.e., A phosphate group, a deoxyribose sugar, and a nitrogenous base. Different forms of DNA are B-DNA, Z-DNA, A-DNA, C-DNA, and D-DNA.
Name the linkage present between the nitrogen base and pentose sugar in DNA.
Read the following and answer from given below:
In prokaryotes, DNA is circular and present in the cytoplasm but in eukaryotes, DNA is linear and mainly confined to the nucleus. DNA or deoxyribonucleic acid is a long polymer of nucleotides. In 1953, the first correct double-helical structure of DNA was worked out by Watson and Crick. Based on the X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin. It is composed of three components, i.e., A phosphate group, a deoxyribose sugar, and a nitrogenous base. Different forms of DNA are B-DNA, Z-DNA, A-DNA, C-DNA, and D-DNA.
The double chain of B-DNA is coiled in a helical fashion. The spiral twisting of the B-DNA duplex produces ______
Which of the following amino acid residues will constitute the histone core?
In a mature, functional mRNA of eukaryotes______.
Nucleosomes are the repeating units of chromatin the part between adjacent nucleosomes is called ______ .
Statement I: In prokaryotes, the positively charged DNA is held with some negatively charged proteins in a region called nucleoid.
Statement II: In eukaryotes, the negatively charged DNA is wrapped around the positively charged histone octamer to form nucleosome.
In the light of the above statements, choose the correct answer from the options given below:
What is the compaction ratio for prokaryotic DNA within the bacterial cell?
In prokaryotic DNA compaction, the looping step creates how many loop domains?
What is the role of topoisomerase I in prokaryotic DNA packaging?
What is the role of histone H1 in eukaryotic chromatin?
What is the total DNA content per nucleosome?
Describe the hierarchical levels of eukaryotic DNA packaging.
What is the charge characteristic of DNA packaging proteins in both prokaryotes and eukaryotes?
What roles do HU proteins play in prokaryotic DNA organisation?
