Q: The "knee-jerk" motion that people involuntarily perform after being struck in the knee in a certain way is an example of what kind of behavior? Choices: - reaction - spasm - sensor - reflex A:
reflex

Q: What are created based upon the loss or gain of electrons? Choices: - crystals - atoms - hydrogens - ions A:
ions

Q: Q: The fuel that burns in a combustion reaction in many fossil fuels such as natural gas that consists of carbon hydrogen is known as what? Choices: - helium - catalyst - fossil - hydrocarbon A:
A: hydrocarbon

Question: Q: Medical problems associated with the body responding poorly to insulin are commonly associated with what disease? Choices: - AIDS - pertussis - colitis - diabetes A:
Answer: diabetes

*Question*
Q: Found in cord blood and other sources, what kind of cells hold the promise of renewing and repairing body tissues? Choices: - red blood cells - white blood cells - neurons - stem cells A:
**Answer**
stem cells

Q: Q: Like the mitochondria, chloroplasts have their own dna and ribosomes, but chloroplasts have an entirely different function. chloroplasts are plant cell organelles that carry out what? Choices: - reproduction - digestion - growth - photosynthesis A:
A: photosynthesis