Q16 of 27 Page 1


a) State the hypothesis which S.L. Miller tried to prove in the laboratory with the help of the set up given above.


b) Name the organic compound observed by him in the liquid water after running the above experiment.


c) A scientist simulated a similar set up and added CH4, NH3 and water vapour at 800℃. Which important component is missing in his experiment?


(a) ‘The first form of life originated from the pre-existing non-living organic molecules. These organic molecules combined to form complex molecules (chemical evolution) which later lead to the formation of life.’ was the hypothesis that S.L. Miller tried to prove. This was to prove chemical evolution.

b) Amino acid was the organic compound observed by him in the liquid water after running the above experiment.


c) Hydrogen (H2) was the important component that was missing in his experiment.


More from this chapter

All 27 →
14

How does gain or loss of chromosome(s) takes place in humans? Describe one example each of chromosomal disorder along with the symptoms involving an autosome and a sex chromosome.

OR


A small stretch of DNA that codes for a polypeptide is given below


3'--- --- --- --- CAT CAT AGA TGA AAC --- --- --- --- 5'


a) Which type of mutation could have occurred in each type resulting in the following mistakes during replication of the above original sequence?


i. 3`… … … …CAT CAT AGA TGA ATC… … … 5`


ii. 3`… … … …CAT ATA GAT GAA AC… … … 5`


b) How many amino acids will be translated in each of the above two cases?


 15

“Apomixes is a form of asexual reproduction that mimics sexual reproduction in plants”. Explain with the help of a suitable example.

 17

(a)


b) A polypeptide consists of 14 different amino acids.


i) How many base pairs must be there in the processed mRNA that codes for this polypeptide?


ii) How many different types of tRNA are needed for the synthesis of this polypeptide?


 18

How can inbreeding be both advantageous and disadvantageous in cattle breeding programme? (Mention any two advantages and two disadvantages)