Q: Combined substances are either compounds or what? Choices: - solutions - concentrations - combinations - mixtures A:
mixtures

Q: What is a pair of valence electrons in a bonded atom that does not participate in bonding called? Choices: - opposite pair - isolated pair - hostile pair - lone pair A:
lone pair

Q: Q: What are the only living organisms that can make their own food? Choices: - bacteria - protozoa - animals - plants A:
A: plants

Question: Q: What molecules with a nitrogen base are the basic components of nucleic acids? Choices: - sporozoans - enzymes - nuclides - nucleiotides A:
Answer: nucleiotides

*Question*
Q: What is the term for polyatomic ligands with two or more donor atoms? Choices: - proteins - polyamines - angiosperms - chelates A:
**Answer**
chelates

(Q).
Q: Plants alternate between haploid and what? Choices: - triploid - monoplooid - monoxoid - diploid A:
(A).
diploid