About __________ percent of the nitrogen applied to
fields runs off into rivers, lakes, and estuaries.
a. 20
b. 30
c. 40
d. 50
e. 75
Answer: d
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Based on the tree shown, vascular tissues is a synapomorphy defining which of the following groups?
A. lycophytes and angiosperms + gymnosperms + ferns B. ferns and angiosperms + gymnosperms C. angiosperms and gymnosperms D. lycophytes and angiosperms + gymnosperms E. hornworts and lycophytes + ferns + gymnosperms + angiosperms
Which is a structural feature shared by DNA, RNA, and proteins?
A) The order of monomers is important for function. B) Each sequence of monomers folds into a different three-dimensional shape. C) Each molecule is a polymer of four different nucleotides. D) Two strands of monomers are connected by hydrogen bonding.
Ghost shrimp and mud shrimp play an active role in:
a. compacting the sediment. b. reducing species through competition. c. decomposition of seagrass roots. d. oxygenating the sediments. e. consuming marsh plants.
What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration?
A) the presence or absence of bonds with oxygen atoms B) the presence or absence of double bonds between the carbon atom and other atoms C) the polarity of the covalent bonds between carbon and other atoms D) the solvent in which the organic molecule is dissolved