Obsteoblasts and osteoclasts
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: B. It speeds up your heart rate to help you deal with danger.
Explanation: When you feel you are in danger, your heart rate goes up to get you ready to run, you pump out more adrenaline, and you are more alert. Also, all the other answers are just wrong. In A you would pay more attention, C is the opposite, and in D you would not need to hear when your body is resting.
I hope this helps!
Answer:
Rudolf Virchow first explained that cells comes from pre existing cells
