Which of the following is a deuterostome phylum?
a. Arthropoda
b. Echinodermata
c. Porifera
d. Platyhelminthes
e. Annelida
B; Deuterostomes include the echinoderms, hemichordates, and chordates. Lophotrochozoans include the mollusks, annelids (choice e), brachiopods, nemerteans, flatworms (choice d), and several other phyla not mentioned in the text. Ecdysozoans include the nematodes, arthropods (choice a), and several other phyla not mentioned in the text. The Porifera (sponges, choice c), cnidarians, and ctenophores are not classified in any of these groups.
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In skeletal muscle contraction, which of the following must be moved to the grooves in the actin
double helix to uncover the crossbridge binding site?
a. troponin b. Ca2+ c. tropomyosin d. ATP e. acetylcholine
What results would you expect if mitochondria are inherited uniparentally from the ? strain?
A) Some, but not all, yeast colonies found on the plate without chloramphenicol will also grow on the plate with chloramphenicol. B) All of the yeast colonies on the plate without chloramphenicol will also grow on the plate with chloramphenicol. C) Many yeast colonies will grow on the plate without chloramphenicol and no colonies will grow on the plate with chloramphenicol. D) No colonies will grow on either plate.
Chemical signals such as __________ have roles in social communication.
Fill in the blank(s) with the appropriate word(s).