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Cell The Unit of Life — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYCell The Unit of Life5 Marks
Question
  1. Where are ribosomes present in a prokaryotic cell? Briefly describe their structure.
  2. Name and differentiate between the two types of bacteria, based on their response to grams stainy.
  3. What is the function of contractile vacuoles? Name an organism, where they are found.
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Answer

  1. Ribosomes are present in association with the plasma membrane in prokaryotic cells:
  • In prokaryotes, ribosomes are associated with the plasma membrane of the cell.
  • They are about 15 nm × 20 nm in size.
  • Each ribosome consists of two subunits- 50 S and 30 S and together they form 70 S ribosomes.
  • They are the sites of protein synthesis.
  1. The two groups of bacteria are:
  • Gram positive bacteria, which take up gram's stain.
  • Gram-negative bacteria, which do not take up gram's stain.
  1. Contractile vacuoles perform excretion and osmoregulation.
  • They are found protists like Amoeba, Paramoecium, etc.

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