Question

1) what is the difference between chromatin fibre and chromosome?
2) what are the rungs of the "DNA ladder" made of?
3)correct the following statements for mistakes, if any.
a) the four nitrogenous bases in the DNA are guanine, thiamine, adrenaline and cytosine.
b) genes are specific sequences of bases on a chromosome.
c) A nucleotide is composed of a sulphate, a sugar (Pentose) and a nitrogenous base.
d) nucleosomes are groups of cysteine molecules surrounded by DNA strands.
e) if there are 46 chromosomes in a cell, there will be 23 chromatin fibres inside the nucleus during interphase.

please ​answer

Answer 1

Answer:

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Answer 2

Explanation:

Ans1:

• Definition of chromatin:: The DNA is a package of special proteins. This proteins are called as histones. it helps in the formation of chromatin.
• It is present throughout the cell cycle.
• Chromatin is visualized through Electron microscope.
• It is Long and thin present in nucleus.
• Chromatin allows DNA replications.
• It is unpaired.

• Definition of chromosome:: Chromosome is a compact structure of nucleic acids and protein present in the nucleus of cells.
• It is clearly visible and found during cell division as highly condensed structures.
• Chromosome is visualized through Light microscope.
• It is compact, thick and ribbon-like. It is found during cell division.
• Chromosome does not undergoes such metabolic activities. It is meant to distribute the genetic information.
• It is paired

Ans2: They showed that alternating deoxyribose and phosphate molecules form the twisted uprights of the DNA ladder. The rungs of the ladder are formed by complementary pairs of nitrogen bases — A always paired with T and G always paired with C.

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