Which of the following viruses can establish a chronic infection of the liver which may progress to liver cancer?
A. hepatitis A
B. HTLV-1
C. hepatitis C
D. hepatitis D
E. hepatitis E
Answer: C
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Which of the following is not a mode of action of antiviral drugs?
A. Block penetration B. Block maturation C. Bond to ergosterol in the cell membrane D. Inhibit DNA synthesis E. Block transcription and translation
The evolutionary innovation that first appeared in arthropods and is characteristic of the most successful of all animal groups is that of
A. three primary types of tissues. B. bilateral symmetry. C. segmentation. D. coelomic body architecture. E. jointed appendages.
B cells are activated when they interact with (antigen-presenting/Th1/Th2 ) cells
What will be an ideal response?
The rhizosphere is the
a. soil interface that contains oxygen. b. soil that receives secretions from plant roots. c. soil that lacks active bacteria. d. topmost 1 m of soil.