Q: What biochemicals mediate changes in target cells by binding to specific receptors? Choices: - amino acids - acids - enzymes - hormones A:
hormones

Q: What is a spectrometer able to produce from starlight? Choices: - radio waves - exposure - aspect - spectrum A:
spectrum

Q: Q: What type of resource is water power? Choices: - biological - nonrenewable - geothermal - renewable A:
A: renewable

Question: Q: What instruments used in guidance systems to indicate directions in space must have an angular momentum that does not change in direction? Choices: - actuators - elevators - magnets - gyroscopes A:
Answer: gyroscopes

*Question*
Q: Most plant cells have a large central what? Choices: - nuclei - loci - membranes - vacuole A:
**Answer**
vacuole

*Question*
Q: Human mammary glands can produce what substance, which can be used to feed children? Choices: - edema - urea - sperm - milk A:
**Answer**
milk