Why do food chains rarely have more than three or four links?
What will be an ideal response?
There is a substantial loss of energy at each step within a food chain, making it energetically unfeasible for a food chain to be longer than a few links.
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A gene for sweat gland production is found on the X chromosome. If a man who lacks sweat glands marries a woman who has normal sweat glands, what will be the phenotype of their children?
A. All of the boys will lack sweat glands. B. All of the girls will lack sweat glands. C. The girls will have sweat glands in some areas, but lack sweat glands in others. D. All of the boys will have sweat glands. E. All the boys will have sweat glands, and the girls will have sweat glands in some areas but not others.
Approximately ____ genes have been identified in the genome of Arabidopsis thaliana
a. 5,400 b. 28,000 c. 67,000 d. 120,000 e. 3,200,000
Jawless fishes were the first vertebrates to leave fossil evidence during the _____ period.
A. Cambrian B. Devonian C. Carboniferous D. Silurian E. Ordovician
Escherichia coli O157:H7 is primarily associated with which of the following foods?
A) ground beef B) dairy products C) eggs D) fomites E) pork