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Answer 1

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Question 1. State the function of Ribosomes.

Answer 1. A ribosome is a cell organelle. It functions as a micro-machine for making proteins. Ribosomes are composed of special proteins and nucleic acids. The translation of information and the linking of amino acids are at the heart of the protein production process.

Question 2. Which organelle in an eukaryotic cell is concern with synthesis and transport of lipid molecule within a cell ?

Answer 2. The endoplasmic reticulum has a number of functions in the cell but is particularly important in the synthesis of many membrane lipids and proteins.

Question 3. Which organelles are present only in plant cells and contain their own genome and ribosomal ?

Answer 3. Both mitochondria and chloroplasts contain their own DNA and ribosomes.

Question 4. Much of the DNA is localised in chromosomes of the nucleus. What is the other major constituents of chromosome.

Answer 4. The major chemical components of the chromosome are RNA, DNA (nucleic acids), and proteins (histones and nonhistones).

Question 5. Which form is the DNA is present in the cell when the cell is not dividing ?

Answer 5. DNA is present in both dividing & non-dividing cells. In non- dividing cells, the chromatin threads contain DNA which later condense to form chromosomes during dividing phase.

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