A group of organisms of the same species living together in the same geographic area is called a(n) _____.
A. aggregate
B. group
C. colony
D. population
E. cluster
Ans: D. population
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While running in a garden, a girl steps on an old board and a nail goes through her shoe and skin,
causing a deep puncture wound. Which of the following non-specific defense mechanisms will aid in defense from pathogens?
a. epithelial cells with cilia b. lysozyme c. acidic skin secretions d. inflammation e. natural killer cells
The concept proven by the experiment in this
figure is that a. protein is not the encoding material. b. protein enters the host cell. c. protein denatures due to radiation. d. protein is composed of subunits with phosphate. e. all of these are correct
Animals that can only be divided into mirror halves along one plane have
A. asymmetry. B. radial symmetry. C. bilateral symmetry. D. acoeloms.
Which one of the following statements about the trypanosome causing African sleeping sickness does not explain why the disease has been difficult to control?
A. Trypanosomes have many variable antigen genes. B. Rearrangement of antigen genes takes place during the asexual cycle. C. Only one gene determining the antigenic nature of the glycoprotein coat is expressed at a time. D. By infesting the red blood cells, trypanosomes can "hide" from the immune system. E. Trypanosomes have a protective glycoprotein coat.