A previously unknown animal is being studied so that it can be classified. It is an invertebrate, triploblastic, dorsoventrally flattened, acoelomate, and has flame cells. Which phylum would you place it in?
A. Platyhelminthes.
B. Mollusca.
C. Arthropoda.
D. Cnidaria.
A. Platyhelminthes.
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In a phenomenon known as satelliting, tiny colonies of Haemophilus spp. may be observed growing on sheep blood agar close to colonies of:
a. Streptococcus pyogenes. b. Staphylococcus aureus. c. Micrococcus spp. d. other Haemophilus spp.
Monoclonal antibodies obtained from a hybridoma provide
A. a large amount of an antibody that is specific for a particular epitope. B. a single antibody that recognizes many epitopes. C. many epitopes that recognize a specific antibody. D. a large number of B cells.
Leaf abscission is initiated and orchestrated by the hormone abscisic acid. Indicate whether the statement is true or false
Which of the following statements about natural selection are true?
A) Directional selection occurs when one extreme phenotype in the population is favored. B) Stabilizing selection favors all phenotypes equally. C) Disruptive selection favors two extreme phenotypes. D) Directional selection is most common in stable environments.