Biology : Molecular Basis of Inheritance

The binding site of tRNA with mRNA & amino acids respectively are

• mRNA with DHU loop and amino acid with CCA end.

• mRNA with CCA end and amino acid with anticodon loop

• mRNA with anticodon loop and amino acid with DHU loop

• mRNA with anticodon loop and amino acid with CCA end

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.

• UUU, UCC, UAU

• UUC, UUA, UAC

• UAG, UGA, UAA 

• UUG, UCA, UCG     

Assertion: An organism with lethal mutation may not even develop beyond the zygote stage.

Reason: All types of gene mutations are lethal.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

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

• UUA - valine

• AUG - cysteine

• AAA - lysine

• CCC - alanine

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.

• If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion

• If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion

• If Assertion is true but Reason is false

• If both Assertion and Reason are false

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

• Gene pool - genome

• Codon - gene

• Cistron - triplet

• DNA fingerprinting - DNA profiling

What is true about tRNA?

• It binds with an amino acid at it 3' end

• It has five double stranded regions

• It has a codon at one end which recognizes the anticodon on messenger RNA

• It looks like clover leafin the three dimensional structure

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?

• UGU

• UGA

• UAG

• UGG

All eukaryotic genes contain two kinds of base sequences. Which of the following plays role in protein synthesis ?

• Introns

• Exons

• Electrons

• Both (a) and (b)