Q: What is the term for something in the environment that causes a reaction in an organism? Choices: - pollution - crisis - climate - stimulus A:
stimulus

Q: How long do the long-lived isotopes require to decay to a safe level in a nuclear reactor? Choices: - tens of years - millions of years - hundreds of years - thousands of years A:
thousands of years

Q: Q: Antibiotic drugs are usually effective in treating what kind of infections? Choices: - viral - lethal - biological - bacterial A:
A: bacterial

Question: Q: Sterols are a subgroup of what? Choices: - nuclides - nutrients - antibiotics - steroids A:
Answer: steroids

*Question*
Q: A, t, g, and c pairs are associated with what substance that is important in genetics? Choices: - plasma - bacteria - blood - dna A:
**Answer**
dna

(Question)
Q: What is denoted by the number above the chemical symbol of each element in a modern periodic table? Choices: - metallic number - atomic weight - electron count - atomic number A:
(Answer)
atomic number