In pure water, a red blood cell from an animal will swell and burst, but a leaf cell from a plant will not. Which structure in the leaf cell is responsible for this difference?
A. cell membrane
B. cell wall
C. mitochondrion
D. nucleus
B. cell wall
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Plastocyanin is a
A) membrane-bound sac found in certain bacteria. B) photosynthetic pigment found in some bacteria. C) copper-containing protein in photosystem II that donates electrons to photosystem I. D) blue-green bacterium known for its unusual photoreactive complex.
Secondary succession occurs ____
a. after a fire b. on a new sand dune c. on bare rock d. immediately after the formation of a man-made lake e. on a newly-formed volcanic island
Paralytic shellfish poisoning occurs when ________ are eaten by humans or marine mammals
A) euglenids B) diplomonads C) diatoms D) excavates E) dinoflagellates
What is the underlying problem in most acquired immunodeficiencies?
A) declining cell-mediated immunity B) declining humoral immunity C) production of autoantibodies D) eosinophilia E) anemia