Pinworm is a nematode parasite that lives in the human rectum and causes itching in the anal area. What best explains the itching symptom?
A. Any kind of parasite will naturally irritate the skin.
B. The itching is a side-effect when the immune system has successfully attacked the nematode.
C. The itching induces the person to scratch, helping to spread the parasite to another person.
D. The itching is because of the mismatch between humans and the parasite's natural host.
Answer: C
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Which of the following molecules will contain an anticodon?
Humans display how much DNA similarity with mice?
A. 80% B. 90% C. 60% D. 50% E. 70%
Mendel selected seven traits in pea plants to study. Why were his results relatively easy to interpret, even though he was examining seven distinct traits?
a. All seven traits were easy to characterize. b. The seven alleles segregated independently from each other. c. Peas are easy to raise and have short life cycles. d. He knew enough mathematics to apply rules of probability to his results.
The Abuja family had 10 children by 1950, but because of ill health, there is now only one surviving grandchild. The Bacchus family had three children in 1950 and now has six grandchildren. Which statement about these families is correct?
A) The Abuja family had more gene drift. B) The Abuja family had greater gene flow. C) The Bacchus family exhibits the bottleneck effect. D) The Bacchus family has greater fitness.