Q: Proteins include 20 common types of what compounds? A:
OPTIONS:
- mitochondria
- rna acids
- dna
- amino acids
amino acids

Q: Carbon dioxide does not rise like other gases because it has a density greater than what? A:
OPTIONS:
- gravity
- light
- water
- air

Answer: air

Question: Q: The sodium-potassium pump is an active transport pump that exchanges sodium ions for what? A:
OPTIONS:
- nitrogen ions
- oxygen ions
- chlorine ions
- potassium ions
Answer: potassium ions

input with options: Q: Acting like drawstrings to close off the alimentary canal, what regulates the passage of material between compartments? A:
OPTIONS:
- intestine
- hamstring
- uterus
- sphincter
output: sphincter

Q: Q: What are chemical bonds between atoms of nonmetals that share valence electrons called? A:

OPTIONS:
- electron bonds
- ionic bonds
- gravitational bonds
- covalent bonds

A: covalent bonds

Q: What allows the electrons to move in an electrochemical system. A:
OPTIONS:
- conduction
- mass
- magnetism
- conductor
conductor