Answer:
The correct answer would be - medium with lactose present and glucose absent.
Explanation:
There are genes present in lac operon that takes part in the lactose metabolism. These genes expressed only if a medium has lactose in absence of glucose.
In the absence of glucose and lactose is present, due to inducer the lac repressor is removed from the operator. This leads to the binding of CAMP to DNA as the CAMP levels are high. It helps in high transcription levels b binding RNA polymerase to promotor.
Answer and explanation;
Carbon is so important in the formation of complicated molecules in that;
-Carbon can form up to four covalent bonds, and it can form reasonably strong bonds with nitrogen, oxygen, and other different types of atoms.
-Carbon also has an almost unique ability to form long chains with <span>C−C</span> linkages, and along the chain there can be regions of different reactivity.<span>
Also </span><span>C−C</span><span> bond is unaffected by water, and therefore, if for example a cell, can be isolated from the aqueous medium.</span>
In 1838, a German botanist, M.I.Schleiden studied the plant cells and emphasized that "cells are organisms and entire animals and plants are aggregations of these organisms arranged according to definite laws. "In 1839, another German zoologist T. Schwann stated "we have seen that all organisms are composed of essentially like parts namely of cells." The deductions of the two microscopists (Schleiden and Schwann) formed the basis of what came to be known as the cell theory. The cell theory holds that all living matter, from the simplest of unicellular organisms to very complex higher plants and animals, is composed of cells and that each cell can act independently but functions as an integral part of the complete organism.
Answer:
A
Explanation:
I believe that coral reefs attract tourists, so it's the only reasonable answer in my opinion
