You decide to volunteer at a community garden and are assigned to tend six equally sized vegetable beds. Three of the beds contain only tomato plants, while the other three contain tomatoes as well as snow peas, bell peppers, cucumbers, okra, and broccoli. You work hard all summer and fall, tending the plants through insect attacks, diseases, and severe summer storms. You harvest vegetables every three days and start to notice a pattern. The mixed vegetable plots consistently produce 4 pecks (a unit of dry goods measurement) each at every harvest, while the tomato only plots produce between 1-6 pecks each at every harvest. The garden director notices the pattern as well, and knowing you are a biology student, she asks you for an explanation.
What concept or hypothesis do you cite in your response?
A. The model of island biogeography
B. The diversity-stability hypothesis
C. The tolerance model
D. The intermediate disturbance hypothesis
E. The productivity hypothesis
B. The diversity-stability hypothesis
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Prezygotic reproductive isolation affects the ability of gametes to combine between species. Of the following, which is not an example of prezygotic reproduction isolation?
A. behavioral isolation B. habitat isolation C. temporal isolation D. hybrid infertility isolation E. mechanical isolation
The Ames test to determine the ability of chemicals to cause mutations uses which bacteria?
1.Salmonella 2.Shigella 3.Staphylococcus 4.Streptococcus 5.Escherichia
Heavy metals work by
A. inactivating proteins. B. binding to DNA. C. mutating DNA. D. dissolving the cell wall. E. rupturing the cell membrane.
The only genus of Gram-negative cocci that causes significant disease in humans is _____.
A) Pastuerella B) Salmonella C) Klebisiella D) Neisseria