Thermococcus,Methanococcus,and Methanobacterium are examples of:

  • A
    Archaebacteria that contain protein homologous to core histones of Eukaryota.
  • B
    Archaebacteria that lack histones resembling those found in Eukaryota but possess $DNA$ supercoiling.
  • C
    Bacteria whose $DNA$ is relaxed or positively supercoiled but which have a cytoskeleton and mitochondria.
  • D
    Bacteria that contain a cytoskeleton and mitochondria.

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Which of the following statements is true for Mycoplasma?

Assertion: Bacteria have three basic shapes,i.e.,round,rod,spiral.
Reason: Cocci and Bacilli may form clusters or chains of a definite length.

Cells of $Nostoc$ are

Which of the following is a common characteristic shared by both methanogens and halophiles?

Which of the following organisms derives energy for $N_2$ fixation through photosynthesis?

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