AIIMS Biology Molecular Basis Of Inheritance Class 12 Questions

m-RNA is formed by

Choose the correct statement.

Assertion : In eukaryotes, both intron and exon are transcribed to form hnRNA Reason : Splicing is required in prokaryotes

Assertion: In eukaryotes, transcription occurs in nucleus Reason: In bacteria, transcription and translation occurs in cytoplasm.

In the Diagram given figure of Lac operon $$\begin{array}{|c|c|c|c|c|c|c|} \hline \text{P} & \text{i} & \text{P} & \text{o} & \text{z} & \text{y} & \text{a} \\ \hline \end{array}$$

Which one of the following options is a correct match of phenomenon and its explanation?

Which of the following is correct regarding genetic code?

During protein synthesis in an organism at one point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt.

Assertion: An organism with lethal mutation may not even develop beyond the zygote stage. Reason: All types of gene mutations are lethal.

Assertion: Polytene chromosomes have a high amount of DNA. Reason: Polytene chromosomes are formed by repeated replication of chromosomal DNA without separation of chromatids.

Assertion : Replication and transcription occur in the nucleus but translation occurs in the cytoplasm. Reason : mRNA is transferred from the nucleus into the cytoplasm where ribosomes and amino acids are available for protein synthesis.

The total number of nitrogenous bases in human genome is estimated to be about

What is the first step in the Southern Blot technique?

Given below is a representation of a kind of chromosomal mutation. What is the kind of mutation represented?

Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it?

Which one of the following pairs of terms/names mean one and the same thing?

What is true about tRNA?

Which one of the following correctly represents the manner of replication of DNA?

Which one of the following codons codes for the same information as UGC?

A point mutation comprising the substitution of a purine by pyrimidine is called

Frameshift mutation occurs when

Assertion : The mRNA attaches itself to the ribosome via its 3' end. Reason : The mRNA has F⁻capsular nucleotide and bases of lagging sequence.

In prokaryotes, genetic recombination can occur during

Assertion : Watson and Crick provided experimental proof of semiconservative nature of DNA replication. Reason : DNA polymerase binds nucleotides in replication.

Assertion : DNA code does not copied in the synthesis of transfer RNA. Reason : Transfer RNA move out of the nucleus and after attaching on the ribosomes, form the template.

Which of the following is the best way to determine paternity?