Question

19. Transfer RNA (TRNA) has two functional sites: 20. Three-base segments on mRNA that specify amino acids are called anticodons. True / False 21. Which of the following is not a product of transcription? a. A new strand of DNA b. rRNA c. tRNA 22. Structural genes encode for any protein or RNA molecules that are required for normal enzymatic or structural functions in the cell True False 23. Regulatory genes encode for protein and RNA molecules whose function is to regulate the expression of other genes Truel False 24. Induction of gene expression is result of cells exposed to a particular end-product Truel False 25. According to the operon model, for the synthesis of an inducible enzyme to occur, the: a. end-product must not be in excess. b. substrate must bind to the enzyme. c. substrate must bind to the repressor d. repressor must bind to the operator. e. repressor must not be synthesized.

Answer 1

Answer 19)

Transfer RNA has the following two sites:

* Amino acid acceptor sites: Amino acid is bound at this site.

* Anticodon : It provides the complementary pairing with codon of mRNA.

Answer 20)

True.

Anticodon are present on tRNA. These codon have three base pair which are complementary to the codons of mRNA.

Answer 21)

A) A strand of DNA.

The transcription process leads to synthesis of RNA. There are three RNA's: tRNA, mRNA and rRNA.

Answer 22)

True.

Because structural genes are the part of operon. They synthesise the protein which is essential for function in the body.

For eg lac operon's structural gene encodes enzymes which leads to break down of lactose.

Answer 23)

True.

Because regulatory gene encodes regulatory molecules such as activator or repressor. They bind to operator and regulate the expression of genes.

Answer 24)

False.

Because in knduction, the inducer is added in the cytoplasm. This inducer binds to the regulatory gene and regulates the activity of structural genes.

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