In a forest you may observe that plants on the forest floor are not as vigorous as other plants; this would most likely be because:

A. They do not get adequate sunlight.
B. Water is limiting.
C. Their leaves are smaller and cannot capture as much light.
D. They are competing for minerals from other plants.
E. They are more affected by gravity than taller plants.


A. They do not get adequate sunlight.

Biology & Microbiology

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The enzyme _____ repairs 99% of mismatched bases immediately during replication

A. DNA ligase B. DNA polymerase C. AP endonuclease D. uracyl glycosylase E. none of these

Biology & Microbiology

Red imported fire ants (RIFAs) disrupt natural communities by ____

a. congregating inside electrical equipment b. competing with native ant populations c. stinging humans with deadly venom d. disrupting pasture land e. killing Texas horned lizards

Biology & Microbiology

In the first experiment to test the pedometer hypothesis in Sahara desert ants, which results did the researchers obtain?

A. Ants with normal legs walked past the home nest, ants with stumps found the nest, ants with stilts were short of the nest B. Ants with stilts walked past the home nest, ants with normal legs found the nest, ants with stumps were short of the nest C. Ants with stumps walked past the home nest, ants with normal legs found the nest, ants with stilts were short of the nest D. None of the above

Biology & Microbiology

In the description of homeostasis, the term dynamic constancy refers to

A) a disregarded theory that suggested there were no external energy requirements to maintain cell homeostasis. B) a constant movement toward equilibrium. C) the direct interaction of each positive feedback system with its corresponding negative feedback system. D) the use of ATP to initiate a cascade effect. E) the fact that even though physical and chemical changes do occur, conditions are kept within a range.

Biology & Microbiology