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Q17: Cytosine always undergoes complementary base pairing with<br>A)adenine.<br>B)guanine.<br>C)thymine.<br>D)uracil.

Q18: The unit molecules (monomers)of carbohydrates are<br>A)monosaccharides.<br>B)amino acids.<br>C)nucleic

Q19: The smallest units of matter are<br>A)molecules.<br>B)atoms.<br>C)protons.<br>D)compounds.

Q20: Two glucose molecules form<br>A)galactose.<br>B)lactose.<br>C)maltose.<br>D)fructose.

Q21: After filling the first shell,the outermost shell

Q23: Lactose is composed of glucose and _.

Q24: When the solute concentration outside a cell

Q25: An atom with the same number of

Q26: Chemically,ATP is a(n)_.

Q27: Neutrons are _ charged particles.