In the controlled laboratory experiment with mice and artificial sweetener, one third of the mice receiving sweetener had bladder cancer. Which of the following would be the best conclusion to this experiment?
A. Since two-thirds did not, this proved that there is still no direct cause and effect relationship
B. This is a small group (100) and such a result could easily be a random result
C. Biological systems are very complicated and results of one third represent an outcome of this complexity;these results give us our best approximation of the likely effects of this sweetener
D. Although none in the control group developed cancer, only a small number of cancerous mice would be required to equal the experimental cases, so it is the number control animal that must be increased to be sure it is not a random effect
Answer: C. Biological systems are very complicated and results of one third represent an outcome of this complexity;these results give us our best approximation of the likely effects of this sweetener
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The Burgess Shale preserves a remarkable fossil record of:
A. delicate flowers and mushrooms from the early invasion of land plants. B. marine life during initial diversification of animals in the Cambrian Period 505 million years ago. C. plants, insects, and mammals around 50 million years ago, as the age of mammals began. D. the tracks of dinosaurs walking on land. E. molecular evidence of bacteria and other organisms.
Which of the following choices is an example of a positive feedback mechanism?
a. ceasing exercise when tired b. sweating when hot c. contractions in childbirth increasing production of oxytocin d. eating when hungry and stopping when full
Fungi are currently classified as six monophyletic groups based on characteristics of the cells undergoing meiosis.
Answer the following statement true (T) or false (F)
Photosynthesis is responsible for producing >50% of Earth's oxygen. During photosynthesis inorganic __ is fixed into organic compounds like___ without the help of sunlight.
A. H2O, Oxygen B. CO2, C6H12O6 C. H2O, C6H12O6 D. CO2, Oxygen E. All of the choices are correct