Answer:
The correct answer is a) the inducer prevents the repressor from binding to the operator
Explanation:
In lac operon lac I gene synthesize repressor protein that binds to the operator region of the lac operon and inhibits the transcription of the mRNA by partially blocking the promotor region of lac operon where RNA polymerase binds.
When the inducer is present it binds to the repressor protein and makes a conformation change in the protein as a result repressor protein is not able to bind the operator region of the operon and do not able to block the transcription of the lac operon.
Therefore in the presence of inducer transcription of operon occurs so the right answer is a) the inducer prevents the repressor from binding to the operator.
Answer: Osmosis occurs when _solvent molecules__ goes from ____lower_____ to ___higher solute concentration______. When the onion and elodea cells were put in salt water the ____water molecules_________ left the cell because their was a ____higher salt concentration________amount outside.
Explanation: Osmosis is simply defined as the net movement of solvent molecules, usually water, from a region of lower solute concentration to a region of higher solute concentration usually through a semi-permeable membrane. Water continues to move out the cell until both solutions in the intra- and extracellular membrane becomes isotonic.
<u>Answer:</u>
<em>B) it requires only transfer RNA (tRNA) and ribosomes.</em>
<u>Explanation:</u>
After the <em>transcription of DNA to RNA</em> in nucleus of cell, the ribosomes synthesis protein and this process is known as the Translation. <em>For the translation process to occur, it requires transfer RNA (tRNA) and ribosomes.</em>
The translation process is also known as cell expression. The ribosomes help in translation by inducing <em>transfer of tRNA sequence of anticodon to codon of mRNA.</em>
