You discover a new type of marine organism that has the kidneys of a fish but no gills. What affect would the absence of gills have on excretion of nitrogenous waste?
A. No affect. Fish kidneys excrete all
nitrogenous waste.
B. Nitrogenous excretion decreases because
no nitrogen uptake is occurring at the gills.
C. Nitrogenous excretion increases at the
kidneys because it cannot be lost at the gills.
D. No affect. Nitrogenous wastes diffuse
across the skin.
C
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Which of the following is true about the role normal microbiota plays in maintaining host health?
A. They provide a surface that is incompatible for attachment of an invader. B. They establish competition for nutrients and vitamins. C. They produce antimicrobial substances. D. They stimulate the immune system. E. All of the choices are true.
Anti-Rh antibodies may not cross the placenta
Indicate whether this statement is true or false.
Animals with a menstrual cycle do NOT
a. have an estrous cycle. b. develop endometriosis. c. display periods of sexual interest. d. produce estrogen. e. undergo menopause.
Based on your knowledge of cell function, what situation below occurs because of the functioning of lysosomes?
What will be an ideal response?