An organism that grows in the presence and absence of oxygen, but faster in the presence of oxygen is called a(n)
a. Microaerophile
b. Obligate anaerobe
c. Obligate aerobe
d. Facultative anaerobe
e. Aerotolerant anaerobe
Answer: d. Facultative anaerobe
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Which of the following types of fungi are typically unicellular, lack heterokaryotic cells, and occasionally produce rhizoids?
A. basidiomycetes B. zygomycetes C. glomeromycetes D. ascomycetes E. chytrids
Sucralose is a non-caloric artificial sweetener. Its structure is similar to sucrose, but with three of sucrose's hydroxyl groups replaced by chloride. How do you predict sucralose behaves in the body?
A. Sucralose enters cells by diffusion. B. Sucralose is unable to bind conventional sugar transporters and is excreted. C. Sucralose binds to glucose transporters and is metabolized by normal metabolic pathways. D. Sucralose does not enter the body.
Tobacco smoke:
a. exposes the smoker to less than 10 carcinogens b. presents more of a risk to male smokers than to female smokers c. takes a long time to manifest in a decrease of respiratory function d. increases respiratory infections e. increases carbon dioxide blood levels but decreases carbon monoxide blood levels
The mass extinction at the end of the Cretaceous period was likely the result of:
a. rising seawater. b. loss of vegetation. c. extreme predation. d. a dramatic change in climate. e. the appearance of new competitors.