*Question*
Q: What was the first amino acid to be isolated? Choices: - histamine - histon - glutathione - asparagine A:
**Answer**
asparagine

*Question*
Q: What source of ocean pollution kills animals by coating them? Choices: - plants spill - grain spill - chemical spill - oil spill A:
**Answer**
oil spill

*Question*
Q: What is a soft, gray, nontoxic alkaline earth metal? Choices: - pewter - magnesium - potassium - calcium A:
**Answer**
calcium

*Question*
Q: What do willow trees produce to kill bacteria? Choices: - chlorophyll - enzymes - cytoplasmic acid - salicylic acid A:
**Answer**
salicylic acid