Helicobacter pylori is responsible for ________.
A. peptic ulcer disease
B. pneumonia
C. cholera
D. dysentery
Answer: A
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Which of the following describe a role that ethylene plays in plant physiology. Check all that apply.
_____ Retarding stem and root elongation. _____ Hastening the ripening of fruit. _____ Inhibition of leaf abscission. _____ Inhibition of lateral bud growth. _____ Accelerates the loss of damaged fruits.
Which of the following statements is FALSE?
a. Ecologist use models to represent relationships between biogeochemical cycles and most ecosystems. b. The physical environment has virtually no reservoir for most elements. c. Inputs from the physical environment and recycling made possible by decomposers and detritivores maintain the nutrient reserves in an ecosystem. d. In most major ecosystems, the amount of nutrients that is cycled within the ecosystem is greater than the amount entering or leaving the ecosystem in a given year. e. Once elements are in the biological part of the biochemical cycles, they are unlikely to leave until the organism dies.
Usually the female is more discriminating than the male when it comes to mating. However, in bush crickets, the opposite is the case. Why is this?
a. Male bush crickets are prettier than female bush crickets. b. A male bush cricket must bring the female a large offering of food in order for the female to accept him as a mate. c. The male contributes a massive amount of energy to the female during mating—his ejaculate makes up about one-fourth of his body weight. d. Male bush crickets have tremendous variation in the desirability of their territories. e. Male bush crickets accept the newly fertilized zygotes from the female and incubate them.
The ____ consists of a whorl of petals.
A. calyx B. sepal C. corolla D. carpel E. stamen