Find CBSE Class 12 Biology Solved Question Paper 2015. These questions not only helps the students to prepare for exams in a better manner, but also helps them in understanding the depth with which a topic should be studied.
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Few Sample Questions from the Question Paper are given below:
Q. List two advantages of the use of unleaded petrol in automobiles as fuel.
Ans.
a) When unleaded petrol is burned it does not give any toxic fumes.
b) Unleaded petrol is manufactured without the addition of anti-knock substance.
Q. Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible?
Ans.
Genome or retrovirus possesses RNA genome that can replicates to form viral DNA with the help of the enzyme reverse transcriptase. This viral DNA now gets incorporated into host’s cellular DNA and directs the infected cells to produce virus particles by host’s machinery.
Q. State the cause of adenosine deaminase enzyme deficiency.
Ans.
The disorder is caused due to the deletion of the gene for synthesis of enzyme adenosine deaminase.
Q. What is a cistron?
Ans.
Cistron is defined as the segment of DNA coding for a polypeptide, the structural gene in a transcription unit could be said as monocistronic (mostly in eukaryotes) or polycistronic (mostly in bacteria or prokaryotes). These segments of DNA are fortified with exon and introns.
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