What four types of atoms are in all amino acids? What type of atom is in some amino acids and not others?
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Explain why phospholipid molecules form a bilayer. (3 marks)

We can be sure that a mole of table sugar and a mole of vitamin c are equal in their 1) mass in daltons. 2) mass in grams. 3) number of molecules. 4) number of atoms. 5) volume.

There are only about 250,000 known fossil species. true or false