Depressants often cause slow movements and loss of sense of balance. These chemical substances reduce the speed and ability of neurotransmitters to communicate. Included in this category of substances are opioids, alcohol and marijuana related products. Pharmacological-related substances are sleeping pills and pain relievers, to help aid sleep and relax muscles.
Answer:
a. Acts as a repressor (inhibits transcription from the lac operon)
Explanation:
LacI is a repressor protein that plays an important role in lac operon. Lac operon is usually switched off i.e. it is inactive in absence of lactose and presence of glucose. The operon has an operator region, promoter region and structural genes.
In absence of lactose, LacI repressor binds to the operator area. Since operator region overlaps with the promoter region, RNA Polymerase is not able to bind to promoter due to presence of repressor. Transcription of lac operon genes does not take place. When lactose is present, some of it is converted into allolactose. Allolactose binds to LacI repressor making it change its shape. The repressor is no longer able to bind to operator region and RNA Polymerase is free to transcribe the genes making the operon active.
<span>they would appear to move to more right</span>
2 in the first and remaining 4 in the (outer) shell
