Infectious protein particles are called
A. phages.
B. oncogenic viruses.
C. prions.
D. viroids.
E. spikes.
Answer: C
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Some cells have several nuclei per cell. How could such multinucleated cells be explained?
A) The cell underwent repeated cytokinesis but no mitosis. B) The cell underwent repeated mitosis with simultaneous cytokinesis. C) The cell underwent repeated mitosis, but cytokinesis did not occur. D) The cell had multiple S phases before it entered mitosis.
What is permafrost? How does it relate to carbon stores?
What will be an ideal response?
The structure labeled "A" is the ____
a. aorta b. inferior vena cava c. pulmonary artery d. pulmonary vein e. superior vena cava
Knowledge of the cell cycle has led to improved means of treating cancer. The drug 5-fluorouracil blocks the synthesis of thymine. This drugs inhibits the cell cycle at the end of
a. G1. b. G2. c. S. d. prophase. e. metaphase.