Viruses are not cellular; they lack most of the features belonging to a cell. They are particles consisting of __________
A) a protein structure with genetic material contained inside
B) naked genetic material
C) genetic material surrounded by a protective carbohydrate shell
D) genetic material associated with additional proteins for viral replication
E) both A and D
A
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What stimulates the production of antibodies by B-cells?
a. B-cells bind to and recognize specific antigens and immediately start to produce antibodies. b. T-helper cells recognize specific antigens and signal B-cells. c. Antigens are recognized by macrophages as nonself, and macrophages signal B-cells. d. Antibodies are produced any time an antigen enters the body.
Human infants of extremely low or high birth weights survive at lower rates than do babies of average birth weight. This is an example of ________ selection
a. directional b. disruptive c. stabilizing d. sexual
Comprehension TOP: MAKING NEW RED BLOOD CELLS
26. On average, an adult male's red blood cell count is around a. 5.4 million per cubic millimeter. b. 3.6 million per cubic millimeter. c. 4.8 million per cubic millimeter. d. 6.0 million per cubic millimeter. e. 7.1 million per cubic millimeter.
Among the variety of virulence factors possessed by pathogenic enteric bacteria, which ones allow them to evade the immune surveillance of its host?
What will be an ideal response?