Why is phosphorus so important to living organisms?
What will be an ideal response?
In the form of phosphate, phosphorus is a component of ATP, NADPH, DNA, RNA, and phospholipids as well as bones and teeth.
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Which stage of syphilis is characterized by a skin rash?
A. Primary B. Secondary C. Latent D. Tertiary
The letter "F" from the above figure represents
a. complement. b. MHC markers with antigen expressed to the surface of a cell. c. lysosome fusing with a phagosome. d. plasma membranes fusing. e. MHC recycling
You would like to identify as many bacterial species as possible in the human mouth. Why is biochemical testing not the most efficient and accurate method of completing this task?
A. Since you do not know the growth characteristics and metabolic properties of the bacteria in the mouth, you cannot determine all varieties of media to use for isolation and culture. B. Bacteriological media is very expensive, particularly when you would have to use a variety of types to identify the different bacteria. C. Biochemical testing, using a variety of media, is inaccurate. It has been replaced by more advanced testing procedures. D. Bacteria in the mouth are difficult to grow because of the adverse conditions in the oral habitat.
Which statement about gymnosperms and angiosperms is FALSE?
a. Both groups produce seeds. b. Both groups are heterosporous. c. Both groups posses vascular tissues. d. In both groups, the sporophyte generation is dominant. e. Both groups have free-living gametophytes.