Which type of gene is required for cell growth and division but can cause malignant transformation when altered?
A. Tumor suppressor gene
B. Proto-oncogene
C. Anti-tumor gene
D. Immunoglobulin gene
Ans: B. Proto-oncogene
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The addition of excess phosphorus causes lakes to become eutrophic because the nutrients trigger blooms of
photosynthetic cyanobacteria. Why do these blooms cause low oxygen levels in lakes?
a. Cyanobacteria use up more oxygen than they produce. b. Excess phosphorus binds to dissolved oxygen in the water. c. Cyanobacteria are net producers of oxygen while alive, but when they die aerobic bacteria use oxygen while decomposing them. d. Cyanobacterial blooms only occur in waters naturally low in oxygen. e. Cyanobacteria are aerobic heterotrophs, consuming oxygen and producing carbon dioxide.
Which of the following is not a component of the demography of a population?
1.size and density 2.distribution pattern 3.age structure 4.all are demographic characteristics
Plants that produce separate male and female flowers are said to be
A) hermaphroditic. B) heterosexual. C) monoecious. D) dioecious. E) homosexual.
If a scientist is conducting a study of how a male bird's song and the female bird's response evolved, what type of causation is she exploring?
A. ethnological causation B. fixed action pattern causation C. proximate causation D. ultimate causation E. stereotyped causation