Q: Q: Which type of tree loses its leaves each fall and remains leafless in the winter? A: | OPTIONS:
- perennial
- conifer
- annual
- deciduous
A: deciduous

Q: Q: Integral and peripheral proteins are associated with what fatty bilayer? A: | OPTIONS:
- protein
- cartilage
- carbohydrate
- lipid
A: lipid

Q: Q: What simple machine consists of a bar that rotates around a fixed point called the fulcrum? A: | OPTIONS:
- battering ram
- rotor
- catapult
- lever
A: lever

Q: Q: Ion pumps, the biological machines responsible for the selective transport of metal ions, are complex assemblies of what? A: | OPTIONS:
- cells
- minerals
- acids
- proteins
A: proteins