Which two structures play direct roles in permitting bacteria to adhere to each other, or to other surfaces?
1. capsules
2. endospores
3. fimbriae
4. plasmids
5. flagella
a) 3 and 4
b) 3 and 5
c) 1 and 2
d) 1 and 3
e) 2 and 3
Ans: d) 1 and 3
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The addition of excess phosphorous causes lakes to become eutrophic because the nutrients trigger
blooms of photosynthetic cyanobacteria. Why do these blooms cause low oxygen levels in lakes?
a. Cyanobacteria use up more oxygen than they produce. b. Excess phosphorous binds to dissolved oxygen in the water. c. Cyanobacteria are net producers of oxygen while alive, but when they die aerobic bacteria use oxygen while decomposing them. d. Cyanobacterial blooms only occur in waters naturally low in oxygen. e. Cyanobacteria are aerobic heterotrophs, consuming oxygen and producing carbon dioxide.
Which of the following is NOT an advantage
of asexual reproduction? a. Asexual reproduction is faster than sexual reproduction. b. Individual organisms do not have to seek mates. c. Asexual reproduction promotes variation. d. Asexual reproduction is less energetically costly than sexual reproduction. e. In stable environments the offspring are as well adapted as the parents
A species that has population levels so low it faces
extinction in all or part of its range is designated as a. riparian. b. endemic. c. endangered. d. fragmented. e. an indicator.
What happens when you drink through a straw
What will be an ideal response?