1) Ribonucleic acid (RNA) is a ______ similar to DNA. a) molecule b) single-stranded c) regulating gene expression 2) Different types of RNA exist in the cell EXCEPT: a) transfer RNA (tRNA) b) messenger RNA (mRNA) c) mitochondria RNA (mtRNA) 3) An RNA strand has a backbone made of a) ribosomal RNA b) ribose and phosphate groups c) four bases--adenine 4) The bases used in RNA are adenine (A), cytosine (C), guanine (G), and thymine (T). a) yes b) maybe c) no 5) In RNA, the base uracil (U) takes the place of a) thymine b) adenine c) guanine 6) ___ sometimes forms a secondary double helix structure, but only intermittently. a) RNA b) DNA c) tRNA 7) A nucleic acid information molecule that transfers information from the genome into proteins by translation. a) mtRNA b) tRNA c) mRNA 8) RNA contains _______________, without the hydroxyl modifications of deoxyribose. a) double helix structure b) ribose sugar molecules c) polymers 9) A large RNA molecule might only be a few ______ base pairs long. a) million b) hundred c) thousand 10) RNA base pairs are a) Adenine and Uracil & Cytosine and Guanine b) Adenine and Thymine & Cytosine and Guanine c) Adenine and Cytosine & Thymine and Uracil

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