What is the function of the operculum?
A. to store urine until excreted
B. to cleanse the blood of toxins
C. to regulate buoyancy
D. to detect changes in water pressure
E. to pump water over the gills
Answer: E
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Indicate whether the statement is true or false.
The physical traits of an organism are called its __
A. phenotype B. allele C. genotype D. gene
Which of the following is one of the most common agents to cause endocarditis?
A) Francisella tularensis B) Rickettsia rickettsii C) Yersinia pestis D) Borrelia burgdorferi E) Staphylococcus aureus
Ca2+-pumps in the plasma membrane and endoplasmic reticulum are important for _____________
(a) maintaining osmotic balance. (b) preventing Ca2+ from altering the activity of molecules in the cytosol. (c) providing enzymes in the endoplasmic reticulum with Ca2+ ions that are necessary for their catalytic activity. (d) maintaining a negative membrane potential.