Which of the following statements is a testable scientific hypothesis?
A) Antioxidants from food are better than antioxidants from a vitamin pill.
B) Eating fish reduces the chance of having a stroke.
C) Embryonic stem cell research will allow scientists to find a cure for diabetes.
D) Smoking makes people less attractive.
B
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Three-spined stickleback fish (Gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets. Longer gill rakers appear to function better for capturing open-water prey,
while shorter gill rakers function better for capturing shallow-water prey. Which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish? A) directional selection B) stabilizing selection C) disruptive selection D) sexual selection
You wanted to test a single fruit fly for the presence of the TOLL protein , so you prick it with a needle coated in fungal spores. The fly dies 2 days later. Which of the following statements is TRUE?
A. This is evidence that the TOLL protein is present. B. This is evidence that the TOLL protein is not present. C. The TOLL protein is only found in humans. D. This is inconclusive evidence.
The cuticle
a. conserves water. b. reduces absorption of carbon dioxide by the plant. c. relegates transpiration to the stomata. d. helps prevent wilting. e. does all of these.
Figure 44.6
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The following question refers to the figure above illustrating logistic growth.
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The population is entering exponential growth at letter ____.
A. A B. B C. C D. D E. E