Select all the examples of evidence for nucleosome supercoiling. A. A 300 Å fiber with 6 nucleosomes per turn is visible using electron microscopy.
B. Removal of some histone H1 causes the 300 A to unwind to 100 A.
C. Using electron microscopy, nucleosomes appear like beads with a diameter of 100 Å.
D. Metaphase chromosomes from which histones have been extracted still maintain an X-like shape.
E. Loops of chromatin are visible using electron microscopy.

A. A 300 Å fiber with 6 nucleosomes per turn is visible using electron microscopy.

C. Using electron microscopy, nucleosomes appear like beads with a diameter of 100 Å.

E. Loops of chromatin are visible using electron microscopy.

Explanation:

The nucleosomes are the key subunits of the chromatin, and they consist of two turns of DNA wrapped around a set of two copies each of the H2A, H2B, H3, and H4 histone proteins (i.e. an octamer of histones), which are connected by linear DNA and H1 histones. A zig-zag array of the nucleosomes form a 100 Angstrom (10-nm) nucleosome fiber. Subsequently, multiple histones are packaged into a 30-nanometer (300 Angstrom) fiber named solenoid. The chromatin loops are finally condensed into higher-order structures, which form chromosome sections (300 nm) and chromosome arms (700 nm), respectively.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

b is the answer and if you need further with anything message me