Lichens are composed of a symbiosis of fungi and which of the following?
A) green algae
B) cyanobacteria
C) euglenoids
D) cyanobacteria or green algae
E) euglenoids or dinoflagellates
D
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The formation of a D-loop is associated with which of the following models of recombination?
A. Double-stranded break model B. Holliday model C. Single-stranded break model
The bundle sheath typically surrounds the larger veins
____________________ Indicate whether the statement is true or false.
When ocean levels dropped about 70 million years ago, marsupial mammals moved into North America and displaced many of the placental mammal species
a. true b. false
Which of the following statements about the two strands of a DNA molecule is true?
A) The strands are connected to each other by sugar-phosphate bonds. B) The strands are a pair of sister chromatids. C) The strands have identical base sequences. D) An A base on one strand always pairs with a G base on the other strand. E) A T base on one strand always pairs with an A base on the other strand.