A condition in which wheezing occurs with breathlessness and a persistent cough, and yields yellowish or greenish phlegm is
A) asthma.
B) bronchitis.
C) lung cancer.
D) lupus.
E) anemia.
B
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During stationary phase, group members of Serratia produce prodigiosins that contain pyrrole
Considering its structural relatedness to other pyrrole-containing molecules of known function (e.g., chlorophylls, bacteriochlorophylls, porphyrins), propose a potential ecological role for these compounds in soil where they are involved in something other than photosynthesis. What will be an ideal response?
You wish to obtain a purified sample of mitochondria from lysed cells. The best way to obtain this sample would be
A) centrifugation. B) chromatography. C) polyacrylamide gel electrophoresis. D) agarose gel electrophoresis. E) both centrifugation and polyacrylamide gel electrophoresis.
__________ can reveal the order of nucleotide bases in a fragment of DNA.
Fill in the blank(s) with the appropriate word(s).
Which of the following is true of Domain Archaea compared to other groups?
A) They are the only anaerobes on Earth. B) None of their genes work like those found in eukaryotes. C) Their cell wall and membrane biochemistry is unique. D) Most of their genes are similar to those found in bacteria. Refer to the scenario below, and then answer the following question(s). As part of your field biology independent study, you visit a small lake with an extremely high salt concentration. Searching with nets and other sampling devices, you find no fish, plants, algae, or any visible signs of life in the lake. Still, you decide to take a few samples of the water back to the lab. You find the sample teeming with very small cells, hundreds of times smaller than a typical human cell. These cells have cell walls, which you analyze chemically and find they are not made of peptidoglycan or cellulose.