Q: Most carcinogens produce mutations in genes that control what? Choices: - ubiquitous cycle - digestive cycle - proteins cycle - cell cycle A:
cell cycle

Q: What is the number of protons in the nucleus? Choices: - element - metallic number - atomic mass - atomic number A:
atomic number

Q: Q: Single bonds allow the atoms they join to rotate freely about the what? Choices: - nucleus - electron shell - atomic orbit - bond axis A:
A: bond axis

Question: Q: How many naturally occurring elements are known on earth? Choices: - 85 - 60 - 87 - 90 A:
Answer: 90

*Question*
Q: What term refers to a wall or partition that divides the heart into chambers? Choices: - valve - cartilage - cysts - septum A:
**Answer**
septum

Q: Q: What is the smallest part of an element called? Choices: - core - neutron - nucleus - atom A:
A: atom