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Molecular Genetics Review Questions for AP Biology

By — McGraw-Hill Professional
Updated on Apr 25, 2014

Review the following concepts if needed:

Review Questions

For questions 10 and 11, please use the following gel:

Review Questions

  1. Which of the following statements is incorrect?
    1. Messenger RNA must be processed before it can leave the nucleus of a eukaryotic cell.
    2. A virus in the lysogenic cycle does not kill its host cell, whereas a virus in the lytic cycle destroys its host cell.
    3. DNA polymerase is restricted in that it can add nucleotides only in a 5'-to-3' direction.
    4. During translation, the A site holds the tRNA carrying the growing protein, while the P site holds the tRNA carrying the next amino acid.
    5. Viroids are plant viruses that are only a few hundred nucleotides in length.
  2. The process of transcription results in the formation of
    1. DNA
    2. Proteins
    3. Lipids
    4. RNA
    5. Carbohydrates
  3. Which of the following codons signals the beginning of the translation process?
    1. AGU
    2. UGA
    3. AUG
    4. AGG
    5. UAG
  4. Which of the following is an improper pairing of DNA or RNA nucleotides?
    1. Thymine-adenine
    2. Guanine-thymine
    3. Uracil-adenine
    4. Guanine-cytosine
    5. Pyrimidine-purine
  5. Which of the following is responsible for the type of diseases that includes "mad cow" disease?
    1. Viroids
    2. Plasmids
    3. Prions
    4. Provirus
    5. Retrovirus
  6. Which of the following is the correct sequence of events that must occur for translation to begin?
    1. Transfer RNA binds to the small ribosomal subunit, which leads to the attachment of the large ribsomal 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 translation begins.
    2. Messenger 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.
    3. Messenger 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 translation can begin.
    4. Transfer RNA binds to the large ribosomal subunit, which leads to the attachment of the small ribsomal 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 translation begins.
    5. Transfer RNA attaches to the large ribosomal subunit, which attracts the mRNA molecule to attach with its first codon in the correct site to the large ribosomal subunit. This signals to the small subunit that it should now bind to the protein synthesis machinery, and translation can begin.
  7. All the following are players involved in the control of gene expression except
    1. Episomes
    2. Repressors
    3. Operons
    4. Methylation
    5. Hormones
  8. Which of the following does not occur during RNA processing in the nucleus of eukaryotes?
    1. The removal of introns from the RNA molecule
    2. The addition of a string of adenine nucleotides to the 3' end of the RNA molecule
    3. The addition of a guanine cap to the 5' end of the RNA molecule
    4. The ligation of exons of the RNA molecule
    5. The addition of methyl groups to certain nucleotides of the RNA molecules
  9. Which of the following statements is not true of a tRNA molecule?
    1. The job of transfer RNA is to carry amino acids to the ribosomes.
    2. 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.
    3. Each tRNA molecule has a short lifespan and is used only once during translation.
    4. The enzyme responsible for ensuring that a tRNA molecule is carrying the appropriate amino acid is aminoacyl tRNA synthase.
    5. Transfer RNA is transcribed from DNA templates within the nucleus of eukaryotic cells.
  10. Which of the DNA pieces in the gel is smallest in size?
    1. A
    2. B
    3. C
    4. D
    5. E
  11. If well 1 is DNA from a crime scene, which individual should contact a lawyer?
    1. Person 2
    2. Person 3
    3. Person 4
    4. Person 5
    5. Person 6
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