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Types of Archaea

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 contain a cytoskeleton and ribosomes

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C

Archaebacteria that contain proteins 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 proteins homologous to eukaryotic core histones
Thermococcus, Methanococcus and Methanobacterium belong to Kingdom Archeae. Archaea are prokaryotes and do not have a well-defined nucleus but they contain proteins homologous to eukaryotic core histones.

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Q. Thermococcus, Methanococcus and Methanobacterium exemplify

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. Identify the correct statements from the following.
1. In bacteria, negatively charged DNA is held by positively charged proteins in the nucleoid region.
2. Bacterial DNA is present in the nucleus.
3. The DNA of bacteria is associated with histones.
4. Bacteria have smaller, circular DNA molecules called plasmids.

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.

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