What are the sporangia of the bread mold Rhizopus?
a) vegetative structures with no role in reproduction
b) sexual structures that produce diploid spores
c) sexual structures that produce haploid spores
d) asexual structures that produce haploid spores
e) asexual structures that produce diploid spores
Answer: d) asexual structures that produce haploid spores
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Only antigen-presenting cells
A. produce antibodies. B. activate cytotoxic T cells. C. produce MHC class I molecules. D. produce MHC class II molecules.
Lemon juice has a pH of 2.0, therefore, ____
a. [H+] < [OH-] b. [H+] = [OH-]
c. [H+] = 0 d. [OH-] = 0 e. [H+] > [OH-]
Who played the most influential role in the discovery of the cell?
a. Matthias Schleiden b. Theodor Schwann c. Rudolf Virchow d. Robert Hooke
The following are all functions of a typical plasma membrane except
A. expression of cellular identity B. selective transport of certain molecules and material C. reception of information D. transport of water and bulk material E. Be permanent in composition