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Chapter - 6, Molecular Basis of Inheritance, , One marks questions, , , , Questions with answer Year Page no., in, Textbook, , , , Lactose is termed as inducer in lac operon. Give reason., Lactose regulates switching on and off of the operon. Hence, it is termed as_| (J-15) 117, inducer., , , , Define transcription?, The process of copying genetic information from one strand of the DNA (J-15) 107, into RNA is termed as transcription., , , , What is euchromatin?, , Euchromatin is a region of chromatin is loosely packed and stains light. (Maly) as, , , , Why DNA replication is called semiconservative?, , After the completion of replication, each DNA molecule would have one, parental and one newly synthesised strand. Therefore DNA replication is, called semiconservative., , (M-17) 104, , , , Which chromosome of man has the least number of genes?, , Y-chromosome (M-19) 120, , , , On which bacteria Griffith conducted transformation experiment?, , Streptococcus pneumonia OR Pneumococcus bacteria -19) 100, , , , Name the inducer which regulates the switching on and off of the lac, operon. (M-20) 117, Lactose, , , , Which type of R.N.A polymerase enzyme transcribes precursor, m.R.N.A? (M-20) 111, RNA polymerase II, , , , Name the process in which introns are removed and exons are joined in, a defined order. (S-20) 111, Splicing, , , , Two marks questions, , , , t-RNA is an adaptor molecule comment., , t-RNA has an anticodon loop that has three specific bases complementary to, the code and bind to mRNA. It also has an amino acid acceptor end to, which an amino acid binds. t-RNAs are specific for each amino acid., , (M-15) 114, , , , Codon AUG has dual function. Justify., » AUG codes for Methionine (met). (M-17) 112, » AUG also act as initiator codon., , , , What are the criteria of DNA to act as a genetic material?, Criteria of DNA act as a genetic material:, (i) It should be able to generate its replica (Replication)., (ii) It should chemically and structurally be stable., , , , , , , , (iii) It should provide the scope for slow changes (mutation) that are cn 103, required for evolution. ;, , (iv) It should be able to express itself in the form of 'Mendelian, , Characters’. (Any Two), , Name the scientist who found out D.N.A and what was the name given (M-20) 97, , , , , , , , by him?, , , , , , S060 ooo, Page 34