Destructive outbreaks of pests are ____ in cultivated fields, which are low-diversity communities, than in natural
communities with greater species richness.
a. less common
b. more common
c. equally common
d. most easily prevented
e. rarely occur
b
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Which of the following contains enzymes capable of digesting an egg’s protective coverings to allow a sperm to fuse with the egg?
a. acrosomal vesicle b. bulbourethral gland c. seminal vesicle d. prostate gland
Suppose a group of researchers analyzed a new species of flowering plant. In this species, flower color is determined by two genes. They crossed a truebreeding red-flowered stock with a truebreeding white-flowered stock. They then crossed the F_1 offspring together and analyzed the next generation. Upon examining the flower color, they found that the F_2 generation contained 178 purple, 60 red, and 80 white flowers. What genetic term best describes the inheritance pattern of flower color for this species?
a. genes in one pathway b. no gene interaction c. dominant epistasis d. recessive epistasis
Genetic evidence has revealed that H. sapiens diverged from _____________________ 100,000 years ago, while
Neanderthals diverged from this species 300,000 years ago, suggesting that modern humans did not descend directly from Neanderthals. Fill in the blank(s) with the appropriate word(s).
Which of the following is a nitrifying microbe?
A. Nitrosococcus B. Nitrosobacter C. Nitrosospira D. Nitrosomonas E. All of the above.