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

Ques: Q: What celestial object has been visited by manned spacecraft and is easily seen from earth? Choices: - venus - the Sun - Jupiter - moon A:
Ans: moon

Ques: Q: The structure of the boeing 787 has been described as essentially one giant macromolecule, where everything is fastened through cross-linked chemical bonds reinforced with this? Choices: - nitrogen fiber - non-covalent interaction - metal-metal bonds - carbon fiber A:
Ans: carbon fiber

Ques: Q: What is necessary in a person who wishes to play wind instruments? Choices: - strong hands - vocal cords - powerful lips - healthy lungs A:
Ans:
healthy lungs