Most flowering plants maximize their ability to take up nutrients by taking part in mutualisms with fungi. These
mutualisms are called ____.
a. root nodules
b. Rhizobium
c. mycorrhizae
d. legumes
e. endodermal associations
ANSWER: c
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According to bottom-up and top-down control models of community organization, which of the following expressions would imply that an increase in the size of a carnivore (C) population would negatively impact its prey (P) population, but not vice versa?
A) P ? C B) P ? C C) C ? P D) P ? C ? P E) C ? P ?
What must occur before a glucose molecule can be broken down to release energy?
a. One ATP molecule must phosphorylate the six carbon sugar. b. Two ATP molecules must phosphorylate the six carbon sugar. c. Three ATP molecules must phosphorylate the six carbon sugar. d. One ATP molecule must be taken away from glucose. e. Two ATP molecules must be taken away from glucose.
Some eukaryotic DNA sequences act as introns in the cells of some tissues and exons in the cells of other tissues. This
is an example of ____, and allows for ____. a. positive control; feedback inhibition b. gene amplification; the regulation of the rate of transcription c. alternative splicing; the formation of different types of closely related proteins d. DNA methylation; the formation of different types of closely related proteins e. DNA replication; heterodimer formation
In the experiment on limb length in tetrapods that was conducted by Davis and Colleagues, a mouse with which genotype would lack defects in limb formation?
A. AaBb B. AaBB C. AABb D. AAbb