Translation - Protein Synthesis

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The mRNA base sequence AUG serves as the "start codon" for protein synthesis. This codon codes for the amino acid
1. methionine
2. tryptophan
3. cysteine
4. tyrosine
Which of the following codons is not a codon for the termination of translation?
1. UGG
2. UAA
3. UAG
4. UGA
Protein synthesis takes place in the direction 5' → 3'. What is the amino acid sequence resulting from this section mRNA?
1. Ser - Arg - Asp - Pro
2. Phe - His - Arg - Gly
3. Val - Pro - Tyr - Leu
4. Ser - Gln - Gly - Ser
A 12-base section of mRNA composed of nothing but the base cytosine would code for the repeated addition of the amino acid
1. Proline
2. Histidine
3. Isoleucine
4. Phenylalanine
The transfer RNA shown here would transport the amino acid
1. (pro) proline
2. (gly) glycine
3. (try) tryptophan
4. (lys) lysine
The process of translation takes place when the mRNA is attached to
1. a mitochondrion
2. the nucleus
3. a ribosome
4. the endoplasmic reticulum
A mutation in DNA coding for a protein results in a change in an mRNA codon from UAA to UAG. This change results in
1. insertion of the wrong amino acid
2. no change
3. premature termination of translation
4. the failure to terminate translation
A mutation in DNA coding for a protein results in a change in an mRNA codon from UGA to UGG. This change results in
1. insertion of the wrong amino acid
2. no change
3. premature termination of translation
4. the failure to terminate translation
A mutation in DNA coding for a protein results in a change in an mRNA codon from ACA to AAC. This change results in
1. insertion of the wrong amino acid
2. no change
3. premature termination of translation
4. the failure to terminate translation
A mutation in DNA coding for a protein results in a change in an mRNA codon from CAG to UAG. This change results in
1. insertion of the wrong amino acid
2. no change
3. premature termination of translation
4. the failure to terminate translation
When three bases constitute a codon, the number of possible codons that can be generated using the four bases in RNA is
1. 3⁴ combinations
2. 4³ combinations
3. 3 x 4 combinations
4. 3 combinations
5. 4 combinations
The tremendous variety of proteins is due to the
1. millions of possible codons in mRNA
2. millions of possible ways that amino acids can be ordered within a protein
3. millions of different bases in DNA
4. millions of different kinds of tRNA
The structure labeled "Z" represents
1. transfer RNA
2. messenger RNA
3. a ribosome
4. the nucleus
The structure labeled "X" represents
1. transfer RNA
2. messenger RNA
3. a ribosome
4. the nucleus
The structure labeled "Y" represents
1. transfer RNA
2. messenger RNA
3. a ribosome
4. the nucleus