Q: Because they are charged (polar), these ions do not diffuse through what? Choices: - substrate - cell wall - protein - membrane A:
membrane

Q: What is a small, relatively simple single-celled organism called? Choices: - ribosome - amoeba - eukaryote - prokaryote A:
prokaryote

Q: Today, new elements are usually named after famous scientists. the names of the elements can be cumbersome to write in full, especially when combined to form the names of compounds. therefore, each element name is abbreviated as a one- or two-letter chemical this? Choices: - notation - title - shorthand - symbol A:
symbol