How many different amino acids are there?
A. 4

B. 5

C. Thousands

D. 20

What is called the "building block" of life?

1. which of the following is correct regarding opiates/opioids: a. they all have a natural component as a starting pointb. they have low addiction possibilitiesc. methadone binds to some of the same receptorsd. a and care correcte. all are correct

Where can you find prokaryotic and eukaryotic cells?