What type of DNA supercoiling is the most common?
What will be an ideal response?
negative
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Unicellular and simple multicellular organisms isolate and eliminate waste materials by:
A. moving the wastes into a contractile vacuole and eliminating them through exocytosis. B. filtering the wastes through specialized filters in the plasma membrane and into the extracellular space. C. secreting wastes into excretory tubules that connect to the outside of the cell. D. filtering the wastes into a collecting tubule and then selectively reabsorbing key solutes prior to excretion. E. All of the answer options are correct.
Which of the following is not true of the nucleolytic proofreading reaction of bacterial RNA polymerase?
A. Water is the nucleophile. B. It occurs when the enzyme backtracks after incorporating a mismatched base. C. rNTP is the product. D. It involves the melting of several RNA-DNA base pairs. E. All of the choices given are true.
The most common cause of community-acquired pneumonia in adults, regardless of age, is:
a. Neisseria meningitidis. b. S. pyogenes. c. S. pneumoniae. d. M. pneumoniae.
Which sequence of events is correct for a specific immune response?
A. lymphocyte development, presentation of antigens, antibody production, challenge of B-cells B. antibody production, lymphocyte production, B-cell challenge, presentation of antigens C. lymphocyte development, presentation of antigens, B-cell challenge, antibody production D. presentation of antigens, B-cell challenge, antibody production, lymphocyte development E. lymphocyte development, challenge of B-cells, antibody production, presentation of antigens