Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

Why are cancer patients often given α-interferon as part of the treatment?

Suggest how pedigree analysis can be useful?

Depending upon the chemical nature of the template (DNA or RNA) and the nature of nucleic acids synthesised from it (DNA or RNA), list the types of nucleic acid polymerases.

Differentiate between the following:

mRNA and tRNA

How is a cancerous cell different from a normal cell?

Explain what is meant by metastasis.

Explain the process of transcription in Eukaryotes.

Explain the process of making heterogeneous nuclear RNA (hnRNA) into a fully functional mRNA in eukaryotes. Where does this process occur in the cell?

Answer the following question.
Construct and label a transcription unit from which the RNA segment given below has been transcribed. Write the complete name of the enzyme that transcribed this RNA. 

Differentiate between a benign tumor and a malignant tumor.

With regard to mature mRNA in eukaryotes.

Regulatory proteins are the accessory proteins that interact with RNA polymerase and affect its role in transcription. Which of the following statements is correct about regulatory protein?

Methyl guanosine triphosphate is added at 5' end of hn-RNA in a process of ______.

If the base sequence of a codon in mRNA is 5'-AUG-3', the sequence of tRNA pairing with it must be ______.

The amino acid attaches to the tRNA at its ______.

To initiate translation, the mRNA first binds to ______.

In transcription in eukaryotes, heterogeneous nuclear RNA (hnRNA) is transcribed by ______.

In eukaryotes, the process of processing of primary transcript involves ______.

On the ribosome, mRNA binds ______ and two sites in the ______ for subsequent amino acids to bind to be close enough to each other for the formation of a peptide bond. 

How do normal cells get transformed into cancerous neoplastic cells? Elaborate giving three examples of inducing agent.