Q: Microfilaments are mostly concentrated just beneath what? Choices: - the nucleus - the cell wall - the cytoplasm - the cell membrane A:
the cell membrane

Q: What are specialized cells that are capable of sending electrical as well as chemical signals? Choices: - hormones - ions - enzymes - neurons A:
neurons

Q: Q: Combined substances are either compounds or what? Choices: - solutions - concentrations - combinations - mixtures A:
A: mixtures

Question: Q: Methyl groups are found within what? Choices: - rna acids - DNA molecules - peptide chains - amino acids A:
Answer: amino acids

*Question*
Q: Rust is an example of the reaction of oxygen with what? Choices: - fuel - carbon - coal - iron A:
**Answer**
iron

(Q).
Q: The neck of the uterus, called the cervix, opens into what? Choices: - bladder - testicle - retina - vagina A:
(A).
vagina