IGCSE Biology Paper-4: Specimen Questions with Answers 82 - 83 of 279

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Question 82

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Essay▾

Described a rod shaped bacteria with the help of an example.

Explanation

The example of rod shaped bacteria is – TMV Tobacco mosaic virus

  • It is a positive-sense single stranded RNA virus that infects a wide range of plants mainly tobacco
  • Its capsid is made from 2130 molecules of coat protein and one molecule of genomic single strand RNA, 6400 bases long
  • The coat protein self-assembles into the rod like helical shape around the RNA, which forms a hairpin loop structure.
Figure Shows Schematic Model of TMV

Question 83

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Describe in Detail

Essay▾

What is the main difference between population and communities?

Explanation

Table Shows Difference between Population and Communities
PopulationCommunities
It is a grouping of individuals of a single species found in a particular area.It is grouping of individuals of different species found in a particular area
All the individuals of a population are morphologically and behaviorally similar to one anotherDifferent members of a community are morphologically and behaviorally dissimilar
Small unit of organization.Larger unit of organization.
Individuals of a population interbreed.Interbreeding is abs

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