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1. Banana plants, which are triploid, are seedless and therefore sterile. Which is the most likely explanation for this phenomenon?
2. Animals maintain a minimum metabolic rate for basic functions such as breathing, heart rate, and maintaining body temperature. The minimum metabolic rate for an animal at rest is the basal metabolic rate (BMR). The BMR is affected by many factors, including whether an animal is an ectotherm or endotherm; its age and sex; and size and body mass. Here is a graph that shows the relationship of BMR per kilogram of body mass to body size for a group of mammals.
Which statement correctly describes the relationship between BMR and body mass?
3. Here is a graph that depicts a first exposure to antigen A on Day 1 with a subsequent, primary immune response. A second exposure to antigen A on Day 30 results in a secondary immune response due to the presence of circulating memory cells that release antibodies against antigen A. There is also a first exposure to antigen B onDay 30.
Which of the following graphs accurately depicts the immune response to antigen B and the reason for it?
(A) (B) (C) (D)
4. Incomplete dominance and epistasis are two terms that define genetic relationships. Which of the following statements best describes the differences or similarities between the two terms?
5. Before the human genome was sequenced by the Human Genome Project, scientists expected that they would find about 100,000 genes. In fact, they discovered that humans have only about 24,000 genes. How can we exhibit so many different traits from so few genes?
6. Which of the following statements about the light-dependent reactions of photosynthesis is correct?
7. The acrosome and cortical reactions that occur immediately after fertilization ensure which of the following?
8. Which aspects of cell structure best reveals the unity of all life?
9. Refer to the codon table for the following question.
Here is a small stretch of mRNA that would be translated at the ribosome:
. . . AUG CUG AAA UCAGGG . . .
Suppose a spontaneous mutation altered the boldface A and changed it to a U.What effect, if any, would this have on the protein formed?
10. Stretching out from the equator is a wide belt of tropical rain forests that are being cut down to provide exotic woods for export to the U.S. and to make land available to graze beef cattle. Which of the following statements is a negative consequence of clear-cutting the tropical rain forests?
11. Mosquitoes resistant to the pesticide DDT first appeared in India in 1959 within 15 years of widespread spraying of the insecticide. Which of the following statement best explains how the resistant mosquitoes arose?
12. DNA sequences in many human genes are very similar to the corresponding sequences in chimpanzees. Which statement gives the most likely explanation of this fact?