Q: The simplest organic compounds have hydrogen and what else? Choices: - sodium - oxygen - nitrogen - carbon A:
carbon

(Question)
Q: What is the raw material for evolution by natural selection called? Choices: - pattern variation - mutation - comparable variation - genetic variation A:
(Answer)
genetic variation

Ques: Q: Gases can be classifed as real or what? Choices: - noble - shape - dense - ideal A:
Ans: ideal

(Q).
Q: What can prevent the passage of molecules and ions between cells, such as in the blood-brain barrier? Choices: - fatty junctions - solid junctions - special junctions - tight junctions A:
(A).
tight junctions

Ques:Q: In addition to glucose, what gas is used during cellular respiration? Choices: - methane - hydrogen - nitrogen - oxygen A:

Ans:oxygen

Q: A molecule has two structures that can be generated. what is this called? Choices: - resonance hybrids - congruence - ethnocentrism - isomerism A:
isomerism