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Molecular Genetics

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Molecular Genetics

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1. Which of the following does not occur during RNA processing in the nucleus of eukaryotes?

The removal of introns from the RNA moleculeThe addition of methyl groups to certain nucleotides of the RNA moleculesThe addition of a guanine cap to the 5? end of the RNA moleculeThe addition of a string of adenine nucleotides to the 3? end of the RNA molecule

2. Which of the following is responsible for the type of diseases that includes “mad cow” disease?

ProvirusPlasmidsPrionsViroids

3. Which of the following is the correct sequence of events that must occur for translation to begin?

Transfer RNA binds to the large ribosomal subunit, which leads to the attachment of the small ribosomal subunit. This signals to the mRNA molecule that it should now bind with its first codon in the correct site to the protein synthesis machinery, and traMessenger RNA attaches to the small ribosomal subunit, with its first codon in the correct site, thus attracting a tRNA molecule to attach to the codon. This signals to the large subunit that it should now bind to the protein synthesis machinery, and translation can begin.Transfer RNA binds to the small ribosomal subunit, which leads to the attachment of the large ribosomal subunit. This signals to the mRNA molecule that it should now bind, with its first codon in the correct site, to the protein synthesis machinery, and tMessenger RNA attaches to the large ribosomal subunit with its first codon in the correct site, attracting a tRNA molecule to attach to the codon. This signals to the small subunit that it should now bind to the protein synthesis machinery, and translatio

4. Which of the following codons signals the beginning of the translation process?

AUGUGAAGUAGG

5. "Which of the following statements is incorrect?"

During translation, the A site holds the tRNA carrying the growing protein, while the P site holds the tRNA carrying the next amino acid.A virus in the lysogenic cycle does not kill its host cell, whereas a virus in the lytic cycle destroys its host cell.Messenger RNA must be processed before it can leave the nucleus of a eukaryotic cell.DNA polymerase is restricted in that it can add nucleotides only in a 5?-to-3? direction.

6. Which of the following is an improper pairing of DNA or RNA nucleotides?

Guanine-thymineUracil-adenineThymine-adenineGuanine-cytosine

7. All the following are players involved in the control of gene expression except

operons.methylation.repressors.episomes.

8. Which of the following statements is not true of a tRNA molecule?

Each tRNA molecule has a short lifespan and is used only once during translation.The job of transfer RNA is to carry amino acids to the ribosomes.The enzyme responsible for ensuring that a tRNA molecule is carrying the appropriate amino acid is aminoacyl tRNA synthase.At the attachment site of each tRNA, there is a region called the anticodon, which is a three-nucleotide sequence that is perfectly complementary to a particular codon.

9. The process of transcription results in the formation of

DNA.proteins.RNA.lipids.

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