Which statement best describes a keystone species?
A) a rare or uncommon species that has a strong effect on its community
B) an abundant species that may or may not affect other species
C) a species that takes up a great deal of space in a community
D) a common species that has a strong effect on its community
A
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The cytoskeleton and motor proteins are important for which of the following processes?
A. cell motility B. whipping motion of sperm flagella C. movement of amoeba by lamellopodia D. muscle contraction E. All of the choices are correct.
What do you know about the structure of atoms? How does it relate to the question?
What will be an ideal response?
Unlike animal cells, plant cells have ________ and ________. Unlike plant cells, animal cells have ________
A) chloroplasts; cell walls; centrioles B) centrioles; chloroplasts; cell walls C) chloroplasts; cell walls; a nucleus D) centrioles; cell walls; large central vacuoles
Which of the following hypersensitivities are T cell-mediated responses against self-antigens or otherwise harmless antigens?
A) type IV hypersensitivities B) type I hypersensitivities and type II hypersensitivities C) type II hypersensitivities D) type III hypersensitivities E) type I hypersensitivities