The closest algal relatives of land plants are _______.
A. charophyceans
B. red algae
C. brown algae
D. angiosperms
A. charophyceans
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A molecule or praticle recognized by the body
as nonself is a(an)
a. antibody. b. antigen. c. complement. d. macrophage. e. phagocyte
Settlers to the United States found between
__________ and __________ passenger pigeons. They are extinct today. a. 15,000-25,000 b. 3-5 billion c. 50-100 million d. none; they are native to Europe e. none of these
Which hypothesis states that the synthesis of DNA or RNA from the small molecules in the ocean would have come after the evolution of the plasma membrane and enzymes?
A. clay-catalyst hypothesis B. protein-first hypothesis C. chloroplast D. RNA-first hypothesis
A biologist has been studying a mollusk that does not have a shell. It lives in the marine environment. Of the examples given below, which one did the biologist study?
A. clam B. chiton C. octopus D. nautilus E. snail