ISC (Science) ISC Class 12 - CISCE Important Questions for Biology (Theory)

Enumerate the cause and the characteristic symptom of PKU.

What are introns?

Transcription is the transfer of genetic code from a DNA molecule to:
(i) RNA molecule
(ii) Second DNA molecule
(iii) Ribosomal sub unit·
(iv) Sequence of amino acids in a protein molecule

Briefly describe the technique employed in DNA fingerprinting.

Give any two features of Genetic Code.

Explain the mechanism of action of T cells to antigens.

Mention one significant difference between Phenotype and Genotype

Give reasons for the following:

The genetic code is 'universal'

State the best-known contribution of Alec Jeffery

Define Frameshift mutations

Describe the experiment performed by Griffith. What conclusions did he infer from his observations?

How did Hershey and Chase prove that DNA is the genetic material?

Length of DNA with 23 base pairs is :

(1) 78.4 Å

(2) 78.2 Å

(3) 78 Å

(4) 74.8 Å

Give one significant contribution of the given scientists

H. Boyer

Describe Avery, McLeod and McCarty’s experiment. State its significance.

Answer the following question: 

What is a Recon?

Initiation codon of protein synthesis in Eukaryotes is ______.

Give one significant contribution to the following scientists:

G. Gamow

Give one significant contribution to the following scientists:

Sanger

What is the central dogma?