Which of these statements about nucleosomes are correct?

a. The histones H2A, H2B, H3, and H4 make up the nucleosome octamer that binds DNA.
b. Most histones are small (less than 150 amino acid residues), basic proteins rich in Lys and Arg.
c. DNA binding to histones has the same effect as positive supercoiling.
d. Degradation of linker DNA yields DNA fragments of about 200 bp.
e. Partial enzymatic digestion of chromatin results in DNA fragments of about 103 bp.

thinking it would be d not too sure but i think it's right

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.