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The packaging of chromatin at a higher l...

The packaging of chromatin at a higher level requires an additional set of proteins that collectively are rerferred to as

A

Small nuclear ribonucleoprotein (SnRNP)

B

Nucleoplasmin protein

C

Ribophorin protein

D

Non histone chromosomal proteins

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The correct Answer is:
D
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Go through the following statements: (i) a typical nucleosome contains 400 bp of DNA helix. (ii) The positively charged DNA is wrapped around the negatively charged histoned octamer to form a structure called nucleosome. (iii) Histones are rich in the basic amino acid residues asparagine ad valine (iv) The packaging of chromatin at higher level requires additional set of proteins that collectively are referred to as nonhistone chromosomal proteins. Find out the wrong statements:-

Assertion :- Packaging of chromatin at higher lever required additional set of proteins. Reason : Non histone chromsomal proteins provide scaffold for packaging of chromatin.

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The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity of first electron affinity or electron gain enthalpy. The first electron affinity is given a negative sign as the addition of an electron to a neutral atom is an exoergic process. The addition of electron to A^(-) requires energy to overcome the force of repulsion. Thus, the second electron affinity is an endoergic process. The magnitude of electron affinity depends on a number of factors such as (i) atomic size (ii) effective nuclear charge (iii) screening effects (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increase as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configuration. In a group, electron affinity decreases as the size increases. However, the members of 3rd period have somewhat higher values than the members in the 2nd period of the same subgroups. Which of the following has least electron affinity?

The amount of energy released when an electron is added to an isolated gaseous atom to produce a monovalent anion is called electron affinity of first electron affinity or electron gain enthalpy. The first electron affinity is given a negative sign as the addition of an electron to a neutral atom is an exoergic process. The addition of electron to A^(-) requires energy to overcome the force of repulsion. Thus, the second electron affinity is an endoergic process. The magnitude of electron affinity depends on a number of factors such as (i) atomic size (ii) effective nuclear charge (iii) screening effects (iv) half and fully filled orbitals and (v) shape of orbital. In general, electron affinity increase as the atomic radii decrease in a period. However, there are exceptions when the atoms have stable configuration. In a group, electron affinity decreases as the size increases. However, the members of 3rd period have somewhat higher values than the members in the 2nd period of the same subgroups. The electron affinities of halogens are: F =- 332, CI =- 349, Br =- 324,I =- 295 kJ mol^(-1) The higher value of CI as compared to that of F^(-) is due to:

NTA MOCK TESTS-NTA NEET SET 69-BIOLOGY
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  2. Members of the same species

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  3. The packaging of chromatin at a higher level requires an additional se...

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  5. Identify the family of monocots from the following .

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  9. Select the correct Statement about the solanaceae Family .

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