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hw 13 - 1 A gene mutation a is a change in the nucleotide...

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1. A gene mutation a. is a change in the nucleotide sequence of DNA b. may be caused by environmental agents c. may arise spontaneously d. can occur in all organisms e. all of these 2. A polysome is a. a ribosomal subunit b. the nuclear organelle that synthesizes rRNA c. an organelle that functions during meiosis d. the two ribosomal subunits together e. an mRNA molecule with several ribosomes attached 3. Amino acids are joined together in proteins by a. hydrogen bonds b . peptide bonds c. anticodons d. wobble effects e. codon bonds 4. How many different types of RNA molecules are needed to make protein? a. 1 b. 2 c. 3 d. 4 e. 6 5. If the DNA triplets were ATG - CGT, the mRNA codons would be a. AUGCGU b. ATGCGT c. UACGCA d. UAGCGU e. none of these 6. Of all the different codons that exist, three of them a. are involved in mutations b. do not specify a particular amino acid c. cannot be copied d. provide instructions such as "stop" e. do not specify a particular amino acid but provide instructions such as "stop" 7.
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