Which statement about the sense of smell in humans is most accurate?
A) Combinations of over 300 receptors allow us to discern thousands of scents.
B) Smell is about equally as strong as taste.
C) Ciliated cells rapidly move scent molecules to the brain for rapid analysis.
D) One hundred different receptor varieties allow us to discern about 100 scents.
Answer: A
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Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
What will be an ideal response?
Charles Darwin
a. studied to be a physician. b. studied to become a clergyman. c. pursued his interests in natural history. d. did all of these. e. did none of these.
Which of the following is one method in which a change in the DNA leads to genetic changes in a population?
A) genetic drift B) mutation C) founder effect D) bottleneck effect
Fred Griffith's experiment, in which he used two strains of Streptococcus pneumoniae, demonstrated that _____.
A. pathogenic bacteria function differently in mice than in other organisms B. harmless bacteria can become transformed into disease-causing bacteria by a bacteria transformation factor C. pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains D. dead cells lose their genetic information E. DNA is a protein rich in nitrogen and phosphorus