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Home Biochemistry Genetic Regulation Prokaryotes See What Others Are Saying!
  • Question
  • In the presence of high levels of tryptophan


  • Options
  • A. attenuator allows transcription of trp structural genes
  • B. attenuator propogates transcription
  • C. attenuator terminates transcription
  • D. none of the above

  • Correct Answer
  • attenuator terminates transcription 


  • More questions

    • 1. Over 50% of common cancers are associated with damage to a protein, p53. This protein

    • Options
    • A. is a cyclin
    • B. is a tumor supressor
    • C. is an oncogene
    • D. regulates apoptosis
    • Discuss
    • 2. Gluconeogenesis requires a higher amount of ATP equivalents as compared to that produced by glycolysis because

    • Options
    • A. gluconeogenesis releases energy as heat
    • B. glycolysis releases energy as heat
    • C. glycolysis occurs in the mitochondria while gluconeogenesis occurs in the cytosol
    • D. all of the above
    • Discuss
    • 3. Difficulties with somatic gene therapy arise from all of the following except

    • Options
    • A. GVHD caused by mature T cells in the transplanted cells
    • B. inserting a gene so that it will function properly
    • C. limited life span of more mature hematopoietic cells
    • D. transducing genetic material into stem cells
    • Discuss
    • 4. Which pair of amino acids absorbs the most UV light at 280 nm?

    • Options
    • A. Threonine & Histidine
    • B. Trp & Tyrosine
    • C. Cystein & Asparagine
    • D. Phenylalnine & Proline
    • Discuss
    • 5. The peptide bond in proteins is

    • Options
    • A. only found between proline residues
    • B. usually cis unless proline is the next amino acid
    • C. usually trans unless proline is the next amino acid
    • D. is planar because of steric hinderance
    • Discuss
    • 6. In cells having organelles, the steps of the Krebs cycle and the electron transport system occur in the

    • Options
    • A. cell membrane
    • B. mitochondria
    • C. endoplasmic reticulum
    • D. none of these
    • Discuss
    • 7. ?-Lymphocytes are often called simply

    • Options
    • A. B cells
    • B. T cells
    • C. T Lymphocytes
    • D. none of these
    • Discuss
    • 8. Which of these hormones is a catecholamine?

    • Options
    • A. Follitropin
    • B. Norepinephrine
    • C. Tetraiodothyronine
    • D. Tetrahydrofolate
    • Discuss
    • 9. Which of these is a type of specific defense against pathogens?

    • Options
    • A. Lymphocytes
    • B. Macrophages
    • C. Phagocytes
    • D. Leukocytes
    • Discuss
    • 10. The HIV virus infects primarily

    • Options
    • A. brain cells
    • B. cells in the immune system
    • C. red blood cells
    • D. liver cells
    • Discuss


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