Humans are least closely related to the
a. chimpanzee.
b. orangutan.
c. gorilla.
d. tarsier.
e. gibbon
D
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Which of the following can be used to estimate the number of microorganisms in a culture?
A. Measurements of microbial biomass B. Direct counts of microbial cells C. Counts of viable cells using colony growth procedures D. All of the choices are correct.
If we think of the DNA double helix as a twisted ladder, what makes up the rungs or steps of the ladder?
A. phosphate groups only B. alternating phosphate groups and sugars C. sugars only D. purines and pyrimidines E. phosphate groups and bases
The Keeling curve in Figure 25.1 shows that while CO2 levels oscillate on an annual basis, overall CO2 levels increase from year to year. Why has this trend continued in the last 50 years?
A. increasing rates of aerobic respiration associated with the rise in world population B. decreasing rates of oxygenic photosynthesis by plants and algae C. clearing of forests to create agricultural land outside the tropics D. combustion of fossil fuels
Continued stimulation of a receptor may lead to a
diminished response and is called __________. Fill in the blank(s) with the appropriate word(s).