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Bacteria

Thermococcus,...

Question

Thermococcus, Methanococcus and Methanobacterium exemplify

A

Bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria

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B

Bacteria that contains cytoskeleton and ribosomes

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C

Archaebacteria, that contain protein homologous to eukaryotic core histones

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D

Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled

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Solution

The correct option is C Archaebacteria, that contain protein homologous to eukaryotic core histones
Thermococcus, Methanococcus and Methanobacterium are archaebacteria. Thermococcus is a thermophilic archaebacteria, while Methanococcus and Methanobacterium are methanogenic mesophilic archaebacteria. A majority of the Archaebacteria have histone as core protein forming the nucleosome as in eukaryotes.
So, the correct answer is 'Archaebacteria, that contain protein homologous to eukaryotic core histones'

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Similar questions

Q. Assertion :Histones are basic proteins of major importance in packaging of eukaryotic DNA. DNA and histones comprise chromatin forming the bulk of eukaryotic chromosome. Reason: Histones are of five major types:

H_{1}, H_{2} A, H_{2} B, H_{3}

H_{4}

.

Q. Thermococcus, Methanococcus and Methanobacterium are

Q. Pick the incorrect statements among the following:
(i) A typical nucleosome contains 400 bp of DNA.
(ii) The positively charged DNA is wrapped around the negatively charged histone octamer to form a structure called nucleosome.
(iii) Histones are rich in the basic amino acid residues like asparagine and valine.
(iv) The packing of chromatin at higher level requires an additional set of proteins that collectively are referred to as non-histone chromosomal proteins.

Q. Assertion Mitochondria and chloroplast are semi- autonomous organelles.
Reason They are formed by division of pre-existing organelles as well as contain DNA but lack protein
synthesisting machinery.

Q. A particular protein is found in both chloroplasts and prokaryotic cells. The protein is similar in structure and function to certain proteins of the cytoskeleton found in all eukaryotic cells.
Which of the following information is an appropriate conclusion to draw from this information?

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