input: OPTIONS:
- acids
- chromosomes
- enzymes
- hormones Now, answer this question: Q: Receptors for what chemical messengers recognize molecules with specific shapes and side groups, and respond only to those that are recognized? A:
A:
output: hormones

Q: How many major forces of elevation cause allele frequencies to change? A:

OPTIONS:
- one
- five
- three
- four

Answer: four

Problem: OPTIONS:
- extrapolation
- conduction
- evaporation
- oxidation
Q: Q: The biological electron transport chain provides for an orderly, stepwise transfer of electrons. both nadh (reduced nicotinamide adenine dinucleotide) and fadh2 (reduced flavin adenine dinucleotide) are energy rich molecules that liberate a large amount of energy during what? A:
Answer: oxidation

Problem:OPTIONS:
- workload and gravity
- thickness and gravity
- stength and gravity
- friction and gravity

Q: What two forces tend to keep an animal stationary and thus oppose locomotion? A:
****
A: friction and gravity

Q: Why does water infiltrate the ground? A:
OPTIONS:
- gravity
- prolonged drought conditions
- run-off from flooding
- because soil and rocks are porous
because soil and rocks are porous

Q: When fuel is burned most of the energy is released as what? A:
OPTIONS:
- humidity
- condensation
- precipitation
- heat

Answer:
heat