Question
It is established that RNA is the first genetic material. Explain giving three reasons.

Answer

Processes like metabolism, translation, splicing evolved around RNA, RNA is reactive and catalyses reaction. In some virus it is the hereditary material. It is so unstable and hence would have mutated to lead to evolution.

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

Study the given flow chart and answer:
  1. Name the defence mechanism used.
  2. In which plant it has been done?
  3. Name the pathogen.
  4. Name the vector used in this technique.

Why are beehives kept in crop field during flowering period? Name any two crop fields where this is practiced.
What do you understand by sertoli cells? What is their functions?
Name the two different categories of microbes naturally occurring in sewage water. Explain their role in cleaning sewage water into usable water.
  1. A DNA segment has a total of 1000 nucleotides, out of which 240 of them are adenine containing nucleotides. How many pyrimidine bases this DNA segment possesses?
  2. Draw a diagrammatic sketch of a portion of DNA segment to support your answer.
"Prevention is better than cure' is an apt slogan to safeguard adolescents from drug abuse. List any six steps that could be taken in this regard.
Name the polymerase which is generally used in PCR? What is the source of this enzyme?
Define decomposition. Write the difference between grazing food chain and detritus food chain. Make a pyramid of biomass.
A couple with normal vision bear a colour blind child. Work out a cross to show how it is possible and mention the sex of the affected child.
The following graph shows the species-area relationship. Answer the following question as directed.

  1. Name the naturalist who studied the kind of relationship shown in the graph. Write the observation made by him.
  2. Write the situations as discovered by the ecologists when the value of 'Z' (slope of the line) lies.
  1. 0.1 and 0.2
  2. 0.6 and 1.2

What does 'Z' stand for?

  1. When would the slope of the line 'b' become steeper?