Which description applies to typical quantitative traits?
A) Such traits are easy to follow using Punnett squares.
B) Such traits are not affected by the environment.
C) Such traits are usually influenced by only one gene.
D) Such traits show continuous variation.
D
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Under the "business as usual" model of climate change, will temperatures change uniformly across the globe?
Examine Figure 48.7 in your text and compare the projected change in temperature in central South America and central Africa at the equator (draw an imaginary line across the globe at its widest point and examine a spot in the middle of each continent along that line). Which of the following best describes the predicted changes? A. Central South America will warm by an average of 7–8 degrees; central Africa will warm by around 3–4 degrees. B. Central South America will warm by an average of more than 8 degrees; central Africa will warm by 1–2 degrees. C. Central South America will remain about the same; central Africa will warm by 7–8 degrees. D. Central South America will warm by 2–3 degrees; central Africa will not change. E. Both central South America and central Africa will warm by 4–5 degrees.
In the comparison of a DNA molecule to a twisted ladder, the rungs (footholds) of the ladder are
A) nitrogenous bases linked together. B) nitrogenous bases linked to phosphate. C) deoxyribose linked to sulfate. D) the backbones of the molecule. E) deoxyribose linked to phosphate.
Suppose you wanted to determine if you should reject the null hypothesis that running a playing fast tempo (as opposed to slow) music in your store has no effect on sales. On 65 randomly selected days with fast tempo music on the average store sales is $2,345 with a sample standard deviation of 45, while on 75 randomly selected days with slow tempo music on the average store sales is $2,555, with a sample standard deviation of 65. What would be the proper t-stat for this hypothesis test?
A. 
B. 
C. 
D. 
Which of the following infectious particles do not have protein in their structure?
A. bacteriophages B. prions C. animal viruses D. viroids E. both prions and viroids