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12th Standard English Medium Biology (Zoology) Subject Molecular Genetics Book Back 3 Mark Questions with Solution Part - I updated Book back Questions

Published on: 13/05/2022

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Questions:

Generic 3

2 x 3 = 6

A low level of expression of lac operon occurs at all the windows for treatment of various genetic disorders. Justify the statement

Distinguish between structural gene, regulatory gene and operator gene

Generic 5

1 x 5 = 5

Why the human genome project is called a mega project?

Generic 2

2 x 2 = 4

Why tRNA is called an adapter molecule?

From their examination of the structure of DNA, What did Watson and Crick infer about the probable mechanism of DNA replication, coding capability and mutation?

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Answers Key:

Generic 3

2 x 3 = 6

In the complete absence of lac operon permease will not be synthesized which is essential for transport of lactose from the medium into the cells, then it cannot act as an inducer. Hence, cannot relieve the lac operon from its repressed state.

Structural gene	Regulatory gene	operator gene
They are concerned with the transcription of mRNA for the synthesis of particular polypeptide	It controls the functioning of operator gene	It determines the functioning of operator gene
They function only when RNA polymerases join	It produces a repressor or apo- repressor for blocking operator gene	It works only when it is not blocked by repressor
They function by forming mRNA for specific polypeptide	It functions through the formation of mRNA of repressor or apo-repressor	It functions through the presence (or) absence of repressor

Generic 5

1 x 5 = 5

Human genome project was considered to be a mega project because
1. It had a specific goal to sequence for everybase pair present in the human genome. (Human Genome has 3.1647 billion nucleotide base pairs).
2. It took around 13 years of completion and got accomplished in year 2006.
3. It was a large-scale project, which aimed at developing new technology and generating new information in the field of genomic studies.
4. As a result of it, several news areas and avenues have opened up in the field of genetics, biotechnology and medical sciences.
5. It provided clues regarding the understanding of human biology.

Generic 2

2 x 2 = 4

tRNA on one hand binds to specific amino acids and on the other hand reads the codon of the amino acid bound to it through its anticodon, it is called as adapter molecule.

They inferred each strand of the double strands helps was used as a template for the formation of a new, daughter strand having a complementary sequence of bases.