What effect do neonicotinoids have on honeybees?
What will be an ideal response?
Neonicotinoids mimic the neurotoxic (nerve-killing) effect of nicotine, a natural insecticide made by plants such as tobacco, and they impair a bee's learning and memory. Honeybees learn to associate floral colors and scents with the quality of food rewards. Neonicotinoids affect the neurons involved in these behaviors, so bees exposed to these pesticides are likely to have difficulty communicating with other members of the colony. Neonicotinoids also increase bees' vulnerability to fungal infection even in amounts too tiny to detect in the insects themselves..
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Why do moderate levels of disturbance result in an increase in community diversity?
A) Habitats are opened up for less competitive species. B) Competitively dominant species infrequently exclude less competitive species after a moderate disturbance. C) The environmental conditions become optimal. D) The resulting uniform habitat supports stability, which in turn supports diversity. E) Less-competitive species evolve strategies to compete with dominant species.
Which carbohydrate-digesting enzyme works in the small intestine?
a. bicarbonate b. bile c. salivary amylase d. pepsin e. pancreatic amylase
A low number of methyl groups is associatedwith:a
cancer. b. famine. c. chemicals in cigarette smoke. d. cancer and famine. e. all of these.
If pseudogenes are nonfunctional, why are they retained in the genome?
What will be an ideal response?