What physical factor can denature or alter a proteins structure in a cell?
a. Phosphorus
b. Nitrogen
c. Light
d. Salinity
ANS: D
The concentration of salt can damage cell walls and alter proteins. There can be large variations on the
surface salinity. Information can be found in the section Marine Life Success Depends upon Physical
and Biological Environmental Factors.
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Evaluate the following statement. "Human activities contributing to global warming could cause the oceans to switch to ice-age mode."
A) This statement is true. B) This statement is false. Changes in human behavior will alleviate any global warming trends. C) This statement is false. Ice ages only begin when Earth is a certain distance from the Sun. D) This statement is partially true. Global warming may cause a change in the oceans, but it is a natural process that is unrelated to human activity.
Compare the birth control policies of India and China
What will be an ideal response?
When an area is experiencing several consecutive days of rather constant weather, it is experiencing:
A) occluded front weather. B) warm-front weather. C) cold-front weather. D) air-mass weather.
The synthesis of a certain drug requires 4 steps. First three steps were relatively easy with percent yields of 97.1%, 94.3% and 92.8% respectively. However, the last step was very difficult with a percent yield of 72.7%. What was the overall percent yield?
A) 27. 9% B) 61.8% C) 72.7% D) 85.0%