Q: What are flightless birds that are strong swimmers and spend much of their time in the water? A:
OPTIONS:
- Emus
- Ostriches
- Cassowaries
- penguins
penguins

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

Answer: cell membrane

Question: Q: What is the low level of radiation that occurs naturally in the environment called? A:
OPTIONS:
- temperature radiation
- neon radiation
- consequence radiation
- background radiation
Answer: background radiation

input with options: Q: The nitrogen that enters living systems by nitrogen fixation is successively converted from organic nitrogen back into nitrogen gas by what? A:
OPTIONS:
- algae
- pollen
- viruses
- bacteria
output: bacteria

Q: Q: Receptors for what chemical messengers recognize molecules with specific shapes and side groups, and respond only to those that are recognized? A:

OPTIONS:
- acids
- chromosomes
- enzymes
- hormones

A: hormones

Q: The flood of sodium ions through the symporter provides the energy that allows what to move through the symporter and into the cell? A:
OPTIONS:
- insulin
- sucrose
- mitochondria
- glucose
glucose