19.Draw the nucleus of a cell and label the:
a. Double layered structure which encloses the nucleus.
b. Visible entangled mass of thread like structures.
c. A darkly stained round structure inside the nucleus.
il. Name the two components of chromosomes. Mention the role of nuclear
pore.
ill) What does DNA molecule contain?
iv) Give one difference between cytoplasm and nucleoplasm.
Answers
The answer to the following questions are as follows :
(i) The diagram of the nucleus of the cell is labelled and attached in the attachment section.
(ii) The two components of chromosomes are coiled DNA and histones. The DNA is termed to be condensed around the another important component , i.e , histones which are termed as nuclear proteins.
- The role of the nuclear pore is control and maintain the movement of all the molecules moving from nucleus to the cytoplasm and also vice versa. As nuclear pores are protein consisting pathways enclosed in a nuclear envelope so they also safeguard the DNA molecule.
(iii) The DNA molecule contains nucleotides which are responsible for transferring the genetic material from parents to the offspring. So basically DNA molecule comprises of genetic or herediatry materials.
(iv) The major difference between cytoplasm and nucleoplasm is that the former one is termed to be seen in all kinds of cells whereas nucleoplasm is only found in eukaryotic cells.
Answer:
DON'T know
Explanation:
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