MCQ
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Same $\text{tRNA}$ can recognise more than one codons differing only at the third position.
Reason : The specificity of a codon is particularly determined by the first two bases.
  • Both assertion and reason are true, and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true, but reason is not the correct explanation of assertion.
  • C
    Assertion is true, but reason is false.
  • D
    Both assertion and reason are false

Answer

Correct option: A.
Both assertion and reason are true, and reason is the correct explanation of assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Assertion (A): Azolla is used as a biofertiliser in rice fields.
Reason (R): Azolla shows the presence of N2 - fixing bacteria in its leaf cavities.
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Streptococcus pneumoniae and Haemophilus influenzae are responsible for causing infectious disease in human beings.
Reason: A healthy person acquires the infection by inhaling the droplets$/$aerosols released by an infected person.
FFor two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion :Mucous membrane immobilises the micro$-$organisms in the body
Reason: Microorganisms and dust particles entering the respiratory tract are trapped in the mucus.
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Lactose in lac operon is promoter gene.
Reason: Lactose inactivates the repressor gene.
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: In mammals, the female secondary sexual characters are developed by gonadotropins.
Reason: Gonadotropins are secreted by Graafian follicle.
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Regulator and operator genes are not associated with constitutive genes
Reason: Constitutive genes need not be repressed.
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Emigration is outward movement of some individuals from local population.
Reason: Emigration is caused by occurrence of deficiencies and calamities.
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Microclimate generally differs from the prevailing regional climatic conditions.
Reason: Microclimate represents the climatic conditions that prevail at local scale or in areas of llmited size.
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Synthesis of tryptophan is self regulatory.
Reason: Tryptophan works both as co$-$repressor and through feedback inhibition.
Assertion (A): Fossils are remains of dead organisms.
Reason (R): Palaeontology is helpful in study of evolution.