Ecdysone, a steroid hormone, controls ____
a. the menstrual cycle
b. molting in arthropods
c. the wake-sleep cycle
d. the formation of hormone receptors
e. the formation of sperm
ANSWER: b
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Which of the following statements about crossing over is false?
A. Crossing over takes place between non-sister chromatids. B. Crossing over takes place between sister chromatids. C. Crossing over occurs during prophase I. D. Sites of crossing over are called chiasmata. E. Crossing over is also called genetic recombination.
Charles Darwin and his son experimented with which plant growth response?
A. gravitropism B. circadian rhythms C. phototropism D. heat shock E. thermotropism
Which statement is true regarding a Barr body?
A) Barr bodies are found in the nuclei of female cells. B) Barr bodies are found in the nuclei of male cells. C) Barr bodies are found in the cytoplasm of male cells. D) Barr bodies are found in the cytoplasm of female cells. E) A Barr body is a condensed, inactive Y chromosome.
To identify an individual through DNA analysis of his or her blood at crime scenes, investigators look for patterns based on:
A) probes. B) short tandem repeats in the DNA. C) transgenic fragments. D) primers.