In transcription, cytosine is paired with

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal

The first amino acid of a new polypeptide chain is