Studies of a soybean plant (Glycine max) and the bacterium Bradyrhizobium japonicum have shown that the tip of a root hair curls toward the bacteria as a response to which of the following?
a. a flavonoid released by soybean roots
b. nod gene products produced by soybean roots
c. nod gene products produced by the bacterium
d. nitrogen fixation by the bacterium
Ans: c. nod gene products produced by the bacterium
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Antibiotics can kill ________________ in the human body, which may sometimes lead to health problems such as inflammatory bowel disease
A. harmful bacteria B. beneficial bacteria C. both harmful and beneficial bacteria D. fungi E. archaeons
Which of the following would a scientist use during the entire process of conducting an experiment?
a. descriptive reasoning and inductive reasoning b. descriptive reasoning and deductive reasoning c. deductive reasoning and inductive reasoning d. only deductive reasoning
Adaptive radiation is demonstrated by ____
a. the dinosaurs going extinct b. coelecanths remaining similar over hundreds of millions of years c. the evolution of mammals after dinosaurs went extinct d. rats and resistance to warfarin e. warbler body mass and survival
Which of the following actions occurs in many plants when CO2 concentrations are high?
A. CAM photosynthesis fixes CO2 at night. B. Water evaporates at a higher rate than usual. C. Guard cells lose turgor, and the stomata close. D. Calcium ions are transported faster through the phloem. E. Oxygen is used by plants for photosynthesis.