Which is/are true of viruses?
A. They may suppress the production of MHC Class I protein.
B. They may produce an MHC Class I mimic protein.
C. They may prevent cell suicide.
D. They may bind to MHC class II antigens.
E.
They may suppress the production of MHC Class I protein, they may produce an MHC Class I mimic protein, AND they may prevent cell suicide.
E
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Which of the following occurs when the cAMP-CAP complex binds the CAP site near the lac promoter?
A. Transcription rate decreases. B. Transcription rate increases. C. RNA polymerase binds to the promoter. D. RNA polymerase binds to the promoter and transcription rate decreases. E. RNA polymerase binds to the promoter and transcription rate increases.
What role do plasmodesmata play in plant cells?
A. They prevent the plant cell from losing water in desert conditions. B. They allow the plant cell to withstand extreme temperatures. C. They serve as sites of protein production in the cell. D. They serve as communication portals between neighboring plant cells, allowing the passage of substances between the two cells.
Foraging bees communicate with other bees in a waggle dance to give information about the food. The important cue in the dance that conveys information about the required flight direction to the food source relative to the hive-sun direction is the
A. angle between the waggle run and the vertical axis within the hive. B. angle between the waggle run in reference to the hive-sun angle. C. angle between the food source and the hive in reference to the sun. D. speed of the waggle dance. E. angle between the waggle run in reference to the direction north from the hive.
Anna recently learned that she is pregnant and is visiting her doctor for her first prenatal visit. Among the many pieces of advice offered to ensure a safe pregnancy, the doctor specifically told Anna to avoid eating any rare meats, including steaks and roast beef, and to avoid changing her cat's litter box. These words of caution were primarily directed at avoiding contact with
A. Taenia saginata B. E. coli O157:H7 C. Cryptosporidium D. Toxoplasma gondii