How might the allele that causes a disease stay in the population if it is fatal to those who have the disease?
a. it occurs only in certain geographic areas
b. it disappears but is continuously replaced by mutations
c. it is present only in heterozygotes
d. it makes the heterozygote resistant to a fatal disease
Ans: d. it makes the heterozygote resistant to a fatal disease
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A reason that some antibiotics harm bacteria, but not humans, is because the antibiotic inhibits bacterial enzymes that humans do not have.
a. true b. false
A bear at a national park has discovered that if it can open the lid of the trash cans, it is likely to find tasty food inside. Soon it is trying to open the trash cans all over the park. What mechanism of learning has occurred?
A. classical (Pavlovian) conditioning B. habituation C. operant conditioning D. air conditioning Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about different learning mechanisms? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What is the difference between a stable isotope and a radioisotope?
a. A stable isotope emits light. b. A radioisotope emits radiation. c. A stable isotope emits radiation. d. A stable isotope absorbs radiation. e. A radioisotope has an unequal number of protons and electrons.
A previously unknown fungus, which causes lethargy and anemia, has been found in the lungs and circulatory systems of infected cows. How should this fungal disease be classified?
a. superficial mycosis b. opportunistic mycosis c. systematic mycosis d. cutaneous mycosis