In this post, I am sharing the Class 12 Biology Chapter 20 Short Questions Notes PDF for the students of Intermediate Part 2. This chapter’s name is Chromosomes and DNA. Students can download the Class 12 Biology Chapter 20 Short Questions Notes PDF on their laptops or mobile. These Biology Notes are for all the boards working under the Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Here are the complete FSC 2nd Year Biology Notes PDF chapters.
FSC Part 2 Biology Chapter 20 Short Questions Notes – Chromosomes and DNA
Differentiate between S form and R form bacteria.
Normal pathogenic form of this bacterium forms smooth colonies on a culture dish. So it is called S from. They are virulent. R-forms lacks an enzyem needed to manufacture the polysaccharide coat. They form rough colonies. So the yare called R form. They are non-virulent.
Define trnasformation?
Transformation is the transfer of genetic material from one cell to another and can alter the genetic makeed up of the recipient cell.
Who discover the transforming principle?
Oswald Avery, Cohn Macleod and Maclyn McCarty.
How was nucleic acid discovered?
Miescher extracted a white substance from the nuclei of human cells and fish sperm. He called this substance “nuclei” as it was specifically associated with the nucleus. The nuclein was acidic in character. So the nuclein was called nucleic acid.
What is the significance of work o Erwin Chargaff?
He proved that the amount of adenine in DNA always equals the amount of thymine and the amount of guanine always equals the amount of cytosine.
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Relevant Notes
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