*Question*
Q: Solar energy travels in what? Choices: - ions - electrons - neurons - photons A:
**Answer**
photons

*Question*
Q: In addition to a vibrating electric field what does an electromagnetic wave consist of? Choices: - radiation field - molecular field - gravitational field - magnetic field A:
**Answer**
magnetic field

*Question*
Q: What is the protein that carries iron that binds with oxygen in red blood cells? Choices: - keratin - potassium - insulin - hemoglobin A:
**Answer**
hemoglobin

*Question*
Q: Prokaryotic cells have what structure outside their plasma membrane? Choices: - plasma wall - cell membrane - sodium channel - cell wall A:
**Answer**
cell wall