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 Multiple Choice QuestionsMultiple Choice Questions

161.

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.


162.

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


163.

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


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164.

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


D.

DNA fingerprinting - DNA profiling

Gene pool is the total gene present in a population. Genome is the total genetic constitution of an organism. Codon is the basic unit of genetic code, a sequence of three adjacent nucleotide in DNA or mRNA that code for an amino acid. Gene is the basic unit of heredity; a sequence of DNA nucleotide that encodes a protein.

Cistron is a segment of DNA nucleotides that codes for a polypeptide chain. Triplet is a three nucleotides sequence coding for an amino acid.

Therefore, codon  triplet
                cistron  gene
DNA fingerprinting is technically called DNA profiling or DNA typing.


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165.

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


166.

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


167.

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)


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169.

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


170.

In operon concept, regulator gene functions as:

  • repressor

  • regulator

  • inhibitor

  • initiator


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