A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot)
However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for the presence or absence of ________.
A) Platyhelminthes; a cuticle of chitin
B) Nematoda; an alimentary canal
C) Annelida; a body cavity
D) Nematoda; a circulatory system
E) Annelida; muscle in the body wall
Answer: D
You might also like to view...
The part of the spirochete that houses the cytoplasm and the nucleoid of spirochetes is called the ________ cylinder.
A. cytoplasmic B. ectoplasmic C. mesoplasmic D. protoplasmic
With the cladistic method, biologists construct phylogenetic trees and classifications by grouping together only those
species that share ancestral character states.
a. True b. False
Which wavelengths of light are most likely to be absorbed by chlorophyll b?
A. UV B. blue C. red D. infrared
Which of the following is diagnostic for Neisseria meningitidis?
A) the presence of Gram-negative diplococci in CSF phagocytes B) a catalase positive reaction C) the presence of lipid A D) the lack of lipooligosaccharide E) the presence of white blood cells in the CSF