Cell Biology and Micro-biology

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1. The adaptive immune response can be activated by antigen presentation to T-helper cells by which of the following immune cells?

  • Cytotoxic T cells
  • Macrophage
  • Plasma cell
  • Mast cell
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2. in a eukaryotic cell mRNA synthesis takes place in the

  • golgi apparatus
  • Cytoplasm
  • Nucleus
  • Endoplamic reticulum

3. The E.coli gene, gene lacZ encodes for which of the following proteins?

  • Beta haemoglobin
  • Beta glactosidase
  • Thiogalactoside transacetylase
  • Beta glactoside permease

4. Which feature terminates RNA synthesis in transcription?

  • Hairpin-loop
  • Ribosome
  • Poly A tail
  • Promoter

5. Which of the following best describes a chemolithotropic organism?

  • An organism which obtains energy from light driven reactions
  • An organism which obtains energy from the oxidation of inorganic chemicals
  • An organism which obtains energy from the oxidation of organic chemicals
  • An organism which obtains energy from the oxidation of sugars

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