Differentiate Between Euchromatin and Heterochromatin. - Biology

Distinguish Between

Differentiate between Euchromatin and Heterochromatin.



  Euchromatin Heterchromatin
1. It is a loosely packed region
of chromatin.
It is a densely packed region
of DNA.
2. It stains light. It stains dark.
3. Euchromatin is a transcriptionally
active chromatin region.
Heterochromatin is a transcriptionally
nearly dormant portion of the genome.
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2015-2016 (March) Delhi Set 1

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How are the following formed and involved in DNA packaging in a nucleus of a cell?

(i) Histone octomer
(ii) Nucleosome
(iii) Chromatin

Name the transcriptionally active region of chromatin in a nucleus.

The number of adenine molecules in a given DNA segment is 25 and the number of cytosine molecules is 45, the total number of nucleotides in the segment is _______________.

Describe the structure of a nucleosome.

Although a prokaryotic cell has no defined nucleus, yet DNA is not scattered throughout the cell. Explain.

Attempt any TWO of the following: 

With the help of a suitable example illustrate ‘Palindrome’. 

Short Answer Question:

Write a short note on DNA packaging in the eukaryotic cell.

Draw neat and labelled diagram of the Nucleosome.

Write a note on the packaging of DNA in prokaryotes.

Explain the formation of a nucleosome.

In prokaryotes, the enzyme RNA polymerase recognizes the promoter by its ______.

The additional set of proteins required for packaging of chromatin at higher level are called ______.

The octamer of histone protein is made of ______.

Which one of the following histone molecule is NOT double in one nucleosome?

The chromatin is packed to form a solenoid structure of ______ diameter.

Telomere has a unique property of __________.

The length of DNA segment having 44 base pairs is ______

The net electric charge on DNA and histones is ______.

Barr body in mammals represents ______.

Which of the following is correct about mature RNA in eukaryotes?

A stretch of euchromatin has 200 nucleosomes. How many bp will there be in the stretch and what would be the length of the typical euchromatin? 

Read the following and answer from given below:

The translation is the process of polymerization of amino acids to form a polypeptide. The order and sequence of amino acids are defined by the sequence bases in the mRNA. The amino acids are joined by a bond called a peptide bond. The ribosome is the site of protein synthesis.

During translation, how many initiation factors are required in eukaryotes for initiation reactions?

Flagella are present both in prokaryotic and eukaryotic cells, however, they differ in:

Which one of the following cell organelle is considered as ‘Cell within a cell’?

Electron Transport System (ETS) is present in a eukaryotic cell in the:

Histones are rich in ______.

Whittaker placed prokaryotes in:

Plasmid has been used as vector because ______.

Which one of the following is not considered as part of the endomembrane system?

Which process occurs in the regulation of gene expression in prokaryotes but does not occur in the regulation of gene expression in eukaryotes?

During translation initiation in prokaryotes, a GTP molecule is needed in:

Watson and Crick proposed the 'Double Helix' structure of DNA based on data produced by ______

______ are the amino acids of histones.

Which one of the following statements about Histones is wrong?

Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?

Which of the following amino acid residues will constitute the histone core?

What do the 'beads on strings' structure of DNA packaging represent?

The most abundant prokaryotes helpful to human in making curd from milk and in the production of antibiotics are the ones categorised as ______ .

Replication of DNA in eukaryotes is initiated by ______.

Name the enzymes involved in replacement of gaps during RNA processing in prokaryotes and eukaryotes.

In a mature, functional mRNA of eukaryotes______.

Define the Transfection.


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