You hang a microscope slide from a submerged, L-shaped PVC pipe in lake water that is 2 feet deep. The slide hangs 6 inches below the surface of the water and remains there for eight weeks. When you remove it and bring it to your lab for observation, you
see that algae, bacteria, and even some fungi have colonized the slide. You determine that you are looking at a(n)
A) biofilm.
B) community of eukaryotes.
C) biological weapon.
D) endotoxin.
Answer: A
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Synthetic compounds similar to which type of plant hormone are used to prolong the shelf life of
vegetables such as lettuces and mushrooms and to keep cut flowers fresh?
a. salicylic acid b. jasmonates c. abscisic acid d. gibberellins e. cytokinins
The probability of tossing a coin and having it be heads or tails is
A. 1/4. B. 2. C. 0. D. 1. E. 1/2.
Which of the following pertains to an improperly canned food product on a store shelf that bulges from microbial activity?
A) thermophilic anaerobic spoilage B) hydrogen sulfide spoilage C) mesophilic spoilage D) bacterial soft rot E) flat sour spoilage
Lampreys and hagfishes:
a. are the only extant jawless vertebrates. b. are the only extant air-breathing fish. c. are more closely related to ray-finned fish than they are to cartilaginous fish. d. have lobed fins. e. first appeared within the last 50 million years.