One property that distinguishes cells in Domain Eukarya from those in Domain Bacteria is the presence of
A. a cell wall.
B. DNA.
C. flagella.
D. membrane-bounded organelles.
Ans: D. membrane-bounded organelles.
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Vector-borne transmission can be either external or internal. In external (mechanical) transmission, the pathogen is carried
A. on a fomite. B. within the vector. C. on the body surface of a vector. D. All of the choices are correct.
Which structure(s) is(are) NOT included in the lymphatic system?
a. lymph nodes b. the spleen c. the thymus d. tonsils e. the thyroid
Resistance of some animals to certain viral diseases is based on
A. lack of spikes for attachment. B. phagocytosis of the virus by the host cell. C. the presence of the viral envelope. D. lack of specific receptors on the host cell.
You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile, using many short extensions of the cytoplasm, each featuring the 9 + 2 filament pattern
It has well-developed organelles and two nuclei, one large and one small. This organism is most likely to be a _____. A) foraminiferan B) radiolarian C) ciliate D) kinetoplastid