The H3.H4 tetramers and H2A.H2B dimers each interact with a particular region of the DNA within the nucleosome.

I. Histone H3.H4 tetramers occupy a key position in the nucleosome by binding the middle and both ends of the DNA.

II. The amino-terminal region of H3 most proximal to the histone-fold region forms a fourth a-helix that interacts with the final 13 bp at each end of the bound DNA.

III. The relatively short length of DNA bound by H2A.H2B dimers is sufficient to prepare the DNA for H3.H4 tetramer binding.

IV. The H3.H4 tetramer forms the bottom part of the histone octamer located across the disc from the DNA ends whereas two H2A.H2B dimer occupies the top part.

Which of the following represents the correct binding of the histones with the DNA?

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#Question id: 33346

#Unit 2. Cellular Organization

Growth of an organism was monitored at regular intervals of times and shown in the graph below. Around what time is the rate of growth zero?

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#Question id: 12333

#Unit 10. Ecological Principles

Coral animals

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#Question id: 18752

#Unit 13. Methods in Biology

polymerases are available with proof reading activity. Which of the following are the characteristics of these types of polymerases?

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#Question id: 1622

#Unit 4. Cell Communication and Cell Signaling

 Polymorphonuclear neutrophils attack bacteria:

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#Question id: 28253

#Unit 5. Developmental Biology

 In invertebrates, an extracellular matrix that forms a fibrous mat around the egg and is involved in sperm-egg recognition is called as____