Sickle-cell disease is a result of an abnormality in __________.
a. albumin
b. thrombin
c. erythropoietin
d. hemoglobin
e. immunoglobulins
Answer: d. hemoglobin
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Chlamydia trachomatis causes
A. gonococcal urethritis. B. trachoma. C. dental caries. D. trachoma and nongonococcal urethritis.
Thinking about the surface of cells, which of these cells has the largest problems due to surface area limitations?
A. A normal E. coli fecal cell in the digestive tract of animals may be 0.003 millimeters, in a rounded rod or cylinder shape. B. An amoeba cell in a lake may be 0.50 millimeters, and variable in shape with many long, narrow extensions of the cell. C. A human egg cell is often 0.13 millimeters, and is spherical in shape. D. A normal Vibrio cholorea bacterium found in contaminated water may be 0.005 millimeters, in a long curved rod shape. E. An epithelial cell lining any mammal arteries may be 0.03 millimeters, and has a very flat shape.
Which of the following is a receptor that responds to light?
A. gibberellins B. phototropin C. cytokinins D. phytochrome E. Phytochrome and phototropin are correct.
The two components of the binomial name of a microorganism are the
a. order and family b. genus and variety c. genus and species d. family and genus