What is the main cause of cancer?
A. DNA replication no longer working properly
B. Old age, during which the cells of the body no longer work properly
C. Exposure to carcinogens in the environment
D. We do not currently know the main cause of cancer.
Answer: C
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The AP-1 transcription factor is a heterodimer of the Fos and Jun proteins. What is the protein-dimerization motif present in these two proteins?
A. basic leucine zipper B. helix-turn-helix C. zinc finger D. homeodomain
Cells grown in culture form a/an ________.
A. monolayer B. bilayer C. plaque D. aggregate
Joan and her doctor notice a suspicious lump in her breast. Joan also has a family history of breast cancer. Which of the following is not a likely next step as they work to determine the cause of the lump?
A. performing a diagnostic mammogram B. genetic testing for mutations in the BRCA1 gene C. taking a biopsy of the lump to look for the presence of cancer cells D. performing a mastectomy to remove all breast tissue in that breast
Each of the following provides evidence in support of the primary role of RNA in the evolution of life EXCEPT ________.
A. RNA is less chemically stable than DNA B. RNA catalyzes peptide bond formation during protein synthesis C. ATP (energy currency of the cell) is a ribonucleotide D. some RNA molecules are catalytic E. RNA can regulate gene expression