What role do zooxanthellae play in the reef-building process?
What will be an ideal response?
Zooxanthellae living within coral polyps play an important role in supplying the polyp with needed energy resources in the form of glycerol. Presumably the polyp uses this energy in its metabolic processes, which result in the secretion of calcium carbonate corallite cups. Additionally, the secretion of solid calcium carbonate is aided by the lower concentrations of CO2 in the surrounding water as a result of the photosynthetic activity of the zooxanthellae. Reduced CO2 levels means a higher pH, which favors calcium carbonate deposition.
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A(n) ________ operon is one whose transcription is repressed by effector molecules.
A. activated B. repressible C. inducible D. coinducible E. compressible
Match the following items with the correct phrases.
_______1. A ringworm infection of the scalp, eyebrows, and eyelashes _______2. An infection of the palms of the hands and, less commonly, the neck and feet caused by Hortaea werneckii _______3. An infection of scalp hair and, less commonly, eyebrows and eyelashes caused by Piedraia hortae _______4. An infection of moustache, beard, pubic, and axilla hair, usually caused by Trichosporon beigelii _______5. A ringworm infection of the soles and between the toes A) Black piedra B) White piedra C) Tinea nigra D) Tinea capitis E) Tinea pedis
A patient's serum is analyzed and found to have an abnormally low level of CD8 molecules. This suggests that the
patient has insufficient numbers of ____.
a. macrophages b. B cells c. cytotoxic T cells d. helper T cells
e. NK cellsThe misshapen version of a protein that causes properly folded proteins to misfold is called a ________.
A. virus B. prion C. viroid D. capsid