What is the flash pattern used by female fireflies to attract males of their species an example of?
A. sexual imprinting
B. an innate releasing mechanism
C. a sign stimulus
D. a supernormal stimulus
Answer: C
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A number of species have declined in abundance around Boston, Massachusetts, since Thoreau's time. These tend to be:
A. the plants least able to change their flowering time. B. the plants that have changed their flowering time the most. C. the plants that have the earliest flowering time. D. the plants that have the latest flowering time. E. None of the above.
When two pairs of homologous chromosomes join for crossing-over, the complex is called a ____
a. kinetochore b. centromere c. sister chromatid d. tetrad e. chiasmata
A 25- year-old female is in kidney failure and needs a transplant. She is A positive and HLA A1A3/B5B7/C2C9/DR4DR8. Which of the following donors would be the best match?
A) her brother, who is B positive and HLA A1A3/B7B5/C2C9/DR8DR4 B) her sister, who is A positive and HLA A3A4/B7B9/C2C3/DR4DR7 C) her mother, who is AB positive and HLA A1A4/B9B5/C9C3/DR8DR7 D) an unrelated donor who is A positive and HLA A6A3/B5B7/C3C10/DR2DR9
Which of the following enzymes does HIV use to synthesize DNA on an RNA template?
A) DNA ligase B) RNA polymerase C) reverse transcriptase D) DNA polymerase