Polysaccharides ____
a. are composed of three linked monosaccharides
b. contain only straight monomer chains
c. are always made of glucose molecules
d. may be insoluble and difficult to break down
e. are formed by cleavage reactions
ANSWER: d
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One of the important roles of ethylene in plant development is that it induces radial swelling in:
A. root and stem seedling development B. embryo expansion C. seed germination D. stem elongations E. auxin production
In eared seals, the main propulsive force for swimming is produced by the:
a. forelimbs. b. hindlimbs. c. undulations of the body. d. tail. e. caudal fin.
The trophic levels that are most seriously harmed by biomagnified pollutants are the lower grazers and producers
Indicate whether the statement is true or false
Starting from the root of a phylogenetic tree, any node that is shown farther from the root than other nodes, means
A. the two species (or groups of species represented) at the farthest node diverged by sympatric speciation.
B. that only those species at the farthest node, from the root, are in a clade.
C. convergent evolution has selected for the species (or groups of species represented) to be similar.
D. the species (or groups represented) diverged most recently from a common ancestor.
E. the species (or groups of species represented) are in the outgroup.