The lac repressor protein is bound to the operator region of the lac operon when there is no lactose in the medium. When introduced in lactose, it binds to an allosteric site on the repressor causing its to change conformation and release from the operator. This allows the polymerase that is bound to the promoter region to proceed transcription of the lac operon genes (LacZ, Lac A, and Lac Y). Translation of these genes forms enzymes that enable the organism to break down lactose for energy.
both are single cells that carry out the functions of life
Explanation:
Both eukaryotic and prokaryotic cells are single cells according to the cell theory and they carry out the functions of life.
- The cell theory postulates that all living organisms are made up of cells and that the cells are the basic organizational unit of life.
- It also proposes that all cells arise from pre-existing cells.
Eukaryotic cells differs from prokaryotic cells in that they have true nucleus and membrane bound organelles.
Despite this seeming different, both cells are able to carryout different life functions as unit and when they combine together, they advance into higher organization of life.
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<span>Ss, Ss, ss, ss will the genotypes formed
So your an
answer is B
hope i helped ;)</span>
<span>C is the correct answer. The forebrain is the largest region of the brain, accounting for around two thirds of the brain's mass. It contains the cerebrum, olfactory and optic cranial nerves, frontal, parietal, occipital and temporal lobes, and the thalamus, hypothalamus and pituitary gland.</span>
