When DNA replication occurs, the DNA strand is being unwound, causing the DNA to be overwound tightly past the replication fork.
For example, If you have ever wrapped two strings around each other and then tried to pull part the middle of the string while holding the ends tight, the rest of the string past the place you're pulling the string apart becomes very tight and strained.
Topoisomerase is an enzyme that binds to the DNA and helps release some of that strain by unwinding the DNA past the replication fork.
That means the correct box is the leftmost one. Hope this helps:)
The plastic wrap that could have caused the browning effect is the ; Plastic wrap made of polyethylene
Ethylene is a multifunctional phytohormone that regulates growth and senescence ( softening and ripening of fruits ) in plants. Ethylene is a gaseous substance produced by fruits after they are harvested, which accelerates the softening and ripening of the fruits.
The browning of the banana will mostly likely be caused by the presence of the ethylene in the polyethylene plastic wrap.
Hence the plastic wrap that could have caused the browning effect on the banana is the polyethylene plastic wrap.
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Answer:
I think the answer is option 3