This seems like a hard question to the naked eyes,but before I answer does it say you need 2 feet in the newspaper? Do you have to put all of your foot on it? Is one sheet of paper only needed?
hot and dry
i need 20 things so this was just randomly added. hot and dry is the answer
Answer: A
Explanation:The Trp operon is responsible for synthesis of the amino acid trytophan when it is not available in the cellular environment.
When the tryptophan is plentiful, a repressor protein binds to two molecules of tryptophan.
Thiss repressor-tryptophan complex binds to the trp operator. This binding prevents the binding of RNA polymerase, so the operon is not transcribed, and no new trptophan is produce.
On the other hand, when tryptophan levels are reduced, the inactive repressor will not bind the tryptophan operator so the operon is transcribed.
Regulation of the trp operon is determined by the concentration of tryptophan; when adequate tryptophan is present in the growth medium, there is no need for tryptophan biosynthesis.
Transcription is turned off when a high concentration of tryptophan is present, and is turned on when tryptophan is absent. The regulatory signal is the concentration of tryptophan itself.
Therefore in the absence of tryptophan, the inactive repressor cannot bind trpO, so operon gene transcription occurs.
Explanation:
when you Observe, you describe what you are seeing at the moment. so observation means seeing.
inference is the result you receive by observation.
for example, "I threw a stick and the dog ran after it and brought it back to me" this is an observation. you don't mention the reason why the dog brought you the stick. you just describe what happened!
but if you say, "the dog was trained to bring back the stick." you are mentioning the reason of the dog's behavior and that's inference.
Answer:
Many cells are specialized. They have structure that are adapted to their function. For eg : muscle cells bring parts of the body together. They contain protein fibres that can contract when energy is available, making the cells shorter.
