<h2>Answer:</h2>
(D)
<h2>Explanation:</h2>
The uneven heating of the Earth’s surface heats up the air which stirs up air currents in the atmosphere Ex. Jet streams, Easterly, Westerly winds.
4, but only one makes it, the rest are called polar bodies.
It is intended to increase immunity against that antigen back to protective levels, after memory against that antigen has declined through time.
Answer:
An Oc mutation on the bacterial chromosome can affect the expression of structural genes on a F plasmid.
Explanation:
An Oc mutation is a mutation in which operator of an operon is constitutively active i.e. repressor fails to bind the operator which leads to unregulated gene expression.
An Oc mutation do not affect the expression of structural genes on F plasmid because <u>an operator is a cis regulatory element and therefore it can only affect the genes which are located on the same DNA</u>. F plasmid genes are located on the plasmid not on the main chromosome of the prokaryotes while tryptophan or lac operon system is in the main chromosome that is why an Oc mutation will not impact genes on plasmid.
