MCQ
The term 'molecular scissors' generally refers to:
- ADNA polymerases
- BRNA polymerases
- CRestriction endonucleases
- DDNA ligases
Explanation:
Restriction endonucleases cut DNA segments at specific sites of 4 or 6 base pair length, called the restriction sites and are therefore known as the molecular scissors. DNA polymerase helps in the synthesis of DNA and RNA polymerase catalyses the synthesis of RNA. DNA ligases on the other hand help in joining DNA fragments by helping in the formation of phosphodiester bonds between them.
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| $(a) \;RNA$ polymerase $I$ | $(i) \;tRNA$ |
| $(b) \;RNA$ polymerase $II $ | $(ii)\; rRNA$ |
| $(c)\; RNA$ polymerase $III $ | $(iii) \;hnRNA$ |
Select the correct option from the following
$(a)$ Pro-hormone insulin contain extra stretch of C-peptide
$(b)$ A-peptide and B-peptide chains of insulin were produced separately in E.coli, extracted and combined by creating disulphide bond between them.
$(c)$ Insulin used for treating Diabetes was extracted from Cattles and Pigs.
$(d)$ Pro-hormone Insulin needs to be processed for converting into a mature and functional hormone.
$(e)$ Some patients develop allergic reactions to the foreign insulin.
Choose the most appropriate answer from the options given below:
| $(a)$ Fourth trophic level | $(i)$ Crow |
| $(b)$ Second trophic level | $(ii)$ Vulture |
| $(c)$ First trophic level | $(iii)$ Rabbit |
| $(d)$ Third trophic level | $(iv)$ Grass |
Select the correct option :
$(a)\quad(b) \quad(c) \quad(d)$