Question: Q: Amines are classified according to the number of carbon atoms bonded directly to what atom? Choices: - helium - oxygen - hydrogen - nitrogen A:
Answer: nitrogen

Question: Q: What happens when turgid cells in a nonwoody tissue push against each other? Choices: - the tissue dies - the tissue melts - the tissues merge - the tissue stiffens A:
Answer: the tissue stiffens

Question: Q: What do chemical reactions need to be activated? Choices: - food - space - products - energy A:
Answer:
energy