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Online Short Questions For Chapter 6 "12th Class Biology Chapter 20 Short Questions Preparation "
Try The Short Questions For 12th Class Biology Chapter 20 Short Questions Preparation
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Total Questions10
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Available Sets6
Biology - 12th Class Biology Chapter 20 Short Questions Preparation
Question # 1
What are chromosomal aberrations? Give its reasons.
- Ans 1: Unequal distribution of chromosomes in daughter cell during cell division or any change in the structure of chromosome leads to abnormalities in chromosome in daughter cell,it is called chromosomal aberration.
12th Class Biology Chapter 20 Short Questions Preparation - Set 1
Question # 1
What are chromosomal aberrations? Give its reasons.
- Ans 1: Unequal distribution of chromosomes in daughter cell during cell division or any change in the structure of chromosome leads to abnormalities in chromosome in daughter cell,it is called chromosomal aberration.
12th Class Biology Chapter 20 Short Questions Preparation - Set 2
Question # 1
Define Mutation.
- Ans 1: The sudden change in DNA or gene is called mutation.
12th Class Biology Chapter 20 Short Questions Preparation - Set 3
Question # 1
How many chromosomes are present in mouse and sugar cane?
- Ans 1: Sugar can has 80 while mouse has 40 chromosomes respectively.
12th Class Biology Chapter 20 Short Questions Preparation - Set 4
Question # 1
Define phenylketonuria. OR What is phenylketonuria?
- Ans 1: In phenylketonuria,phenylalanine is not degraded because of defective enzyme phenylalanine hydroxylase. Phenylalanine consequently accumulates in the cells leading to mental retardation,as the brain cells fails to develop in infancy.This disorder is due to point mutation.
12th Class Biology Chapter 20 Short Questions Preparation - Set 5
Question # 1
How is newly synthesized mRNA protected after transcription?
- Ans 1: A cap and tail is added so that molecule may remain stable during its travelling to cytoplasm. The cap is in the form of 7-methyl GTP where as tail is in the form of poly A tail linked to 3 end of the RNA.These cap and tail protects RNA from action of enzymes.
12th Class Biology Chapter 20 Short Questions Preparation - Set 6
Question # 1
What are Okazaki fragments? Also give their length.
- Ans 1: During replication of DNA,one of its strands is discontinuously synthesized in the form of fragments called Okazaki fragments.Its length in eukaryotes is 100 to 200 nucleotides while in prokaryotes it is 1000 to 2000 nucleotides.
12th Class Biology Chapter 20 Short Questions
Here you can prepare 12th Class Biology Chapter 20 (Chromosoms and DNA). Click the button for 100% free full practice.
