What type of cell, once it enters the tissues, is converted into a macrophage that attacks invaders by phagocytosis?
A) neutrophil
B) monocyte
C) lymphocyte
D) basophil
E) eosinophil
Ans: B) monocyte
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In his experiments, Anfinsen treated a protein with a chemical that broke disulfide bonds and then removed the
chemical to see how this would affect the function of the molecule. What did he conclude from these experiments?
a. The information for determining the three-dimensional shape of ribonuclease lies in its amino acid sequence. b. The disulfide bonds are essential for quaternary, but not tertiary, protein structure. c. Protein conformation is maintained when disulfide bonds are disrupted. d. Altering the three-dimensional shape of the protein is irreversible. e. Disulfide bonds are unnecessary for proper protein function.
Which of the following would provide the longest lasting treatment for adenosine deaminase (ADA) deficiency?
A) Using siRNA to knockdown ADA genes B) Using cDNA to produce ADA in E. coli C) Receiving white blood cells genetically modified to carry functional ADA genes D) Injecting cloned human adenosine deaminase (ADA) purified from a cow
Cilia and flagella are most similar in
a. length. b. the kinds of cells that have them. c. the number that cells usually have. d. their internal composition and structure. e. their location along the cell's periphery
You had a cold last month and you caught another one this month from your daughter. Why could this
happen? a. Memory cells were not formed as a response to the first cold. b. The antibodies formed as a response to the first cold were degraded. c. The two cold viruses are significantly different. d. Your T cells are not working properly. e. Your antigen-presenting cells do not recognize the second cold virus.