Which of the following is a distinct component of the cell wall of gram-negative bacteria?
A. lipopolysaccharide
B. capsule
C. flagellum (a)
D. plasma membrane
E. peptidoglycan
Ans: A. lipopolysaccharide
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Seeds appeared in the fossil record by
A. 100 million years ago. B. 365 million years ago. C. 545 million years ago. D. 780 million years ago. E. a billion years ago.
Which respiratory disease is caused when bacterial enzymes destroy the alveolar walls and the surface area of the lungs declines?
a. Emphysema b. Tuberculosis c. Asthma d. Apnea e. Pneumonia
Which activity would result in a decrease in your ecological footprint?
A) flying across the United States once a month B) driving your car to and from school every day C) leaving the water running while you brush your teeth D) taking a city bus instead of driving to work
Localized areas of destruction occurring on plants that have been infected by a virus are referred to as ________ lesions.
Fill in the blank(s) with the appropriate word(s).