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: 12383

#Unit 7. System Physiology – Animal

Which of the following changes tends to increase urinary Ca++ excretion?

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#Question id: 28425

#Unit 5. Developmental Biology

The one sheet of cells into two sheets of cells formation during hypoblast formation in avian embryogenesis is termed as__ 

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#Question id: 18602

#Unit 13. Methods in Biology

Suppose a unbiased die is thrown 72 times and getting a 4 on a throw is termed as success then find the variance of number of success ?

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#Question id: 31022

#Unit 4. Cell Communication and Cell Signaling

The dissociation constant is the ratio of the two rate constants, which is presented by:

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#Question id: 15542

#Unit 8. Inheritance Biology

How would you expect a mutation in a gene encoding a tail fiber protein would affect the plaque phenotype of T4?