Q: Channel proteins and carrier proteins help substances diffuse across what? A:
OPTIONS:
- endoplasmic reticulum
- ribosomes
- cytoplasm
- cell membrane
cell membrane

Q: The axon contains microtubules and neurofilaments that are bounded by a plasma membrane known as what? A:
OPTIONS:
- exolemal
- axolenon
- xerophyte
- axolemma

Answer: axolemma

Question: Q: In science, what is constantly tested, sometimes revised, sometimes thrown out and sometimes well-established? A:
OPTIONS:
- a technique
- a study
- a variable
- a theory
Answer: a theory

input with options: Q: Phagocytosis, pinocytosis, and receptor-mediated endocytosis are the three types of what? A:
OPTIONS:
- modulators
- mitosis
- nanoparticles
- endocytosis
output: endocytosis

Q: Q: What globular protein is used in the construction of the hollow tube? A:

OPTIONS:
- actin
- cyclin
- keratin
- tubulin

A: tubulin

Q: The ratio between the radii of a wheel and axle determines what? A:
OPTIONS:
- fundamental mechanical advantage
- introduced mechanical advantage
- theoretical mechanical advantage
- ideal mechanical advantage
ideal mechanical advantage