DNA within the cell is wrapped around nucleosomes to form chromatin. When chromatin is in the form of a 30 nm fibril, how many c
opies of H1 and H2A histone proteins would be found in a stretch of chromatin containing 20 nucleosomes? a. 40 H1, 20 H2A
b. 20 H1, 40 H2A
c. 40 H1, 40 H2A
d. 10 H1, 30 H2A
e. 20 H1, 20 H2A
Chromatin is a complex that protects and condenses the genetic material comprised of DNA and proteins. When chromatin is in the form of a 30 nm fibril, nucleosomes have a regular positioning along the DNA. This means that each nucleosome is associated with a single H1 molecule. Therefore a chromatin containing 20 nucleosomes will have 20 copies of H1 and 40 copies of H2A, because each nucleosome has 2 copies of the core histone H2A.
"Periodic drought causes an abrupt decrease in vegetation" is the one among the following that <span>is caused by the modification of density–independent factors. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has helped you.</span>
The combination of weathering and movement of the resulting sediments is called erosion. Lithification is the changing of sediments into rock. There are two processes involved in this change, compaction and cementation.
