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

168.

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)

The direction of DNA replication is from :

• amino acid end

• 3' end towards 5' end

• 5' end towards 3' end

• amino terminus to carboxy terminus

In operon concept, regulator gene functions as:

• repressor

• regulator

• inhibitor

• initiator