Alexander Fleming kept finding mold contamination that was killing his bacterial cultures. This observation eventually lead to the development of the antibiotic penicillin. Why would the fungi produce a compound that is selectively toxic to bacteria?
A. The bacteria produce toxins that can kill the fungi.
B. The fungi and the bacteria have a symbiotic relationship.
C. The fungi are parasites of the bacteria.
D. The fungi compete with the bacteria for resources.
Answer: D
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Which one of the following cell types would likely have the most extensive system of smooth endoplasmic reticulum?
A. skin cells B. pancreatic cells that secrete digestive enzymes C. testicular cells D. central nervous system cells E. muscle cells
Developing truffles produce a chemical that attracts what kind of organism for spore dispersal?
A. pigs B. flies C. ants D. amphibians E. birds
Which two structures of the human digestive tract can be classified as endocrine glands because they produce hormones?
a. the liver and small intestine b. the pancreas and small intestine c. the pancreas and stomach d. the liver and pancreas
What is the name of the process by which one cell divides its material into two smaller cells?
a. interkinesis. b. reduction division. c. synapsis. d. cytokinesis. e. karyokinesis.