A protist that contains contractile vacuoles most likely lives ________
A) in a marine environment
B) within the cells of another organism
C) in fresh water
D) in ice
C
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Erwin and Scott used an insecticidal fog to knock down insects from the top of a L. seemannii tree
The researchers identified over 900 species of beetles among the individuals that fell. Erwin also projected that this entire tree is host to about 600 arthropod species unique to this tree species. There are approximately 50,000 species of tropical trees. Although it could not be entirely accurate, what would be the best way to estimate the total number of arthropod species? A) Estimate the species density and then multiply by 50,000. B) Multiply 900 by 50,000. C) Multiply 600 by 50,000. D) Divide 900 by 600 and then multiply by 50,000.
DNA isolated from Aspergillis has an adenine content of 25%. Based upon this information, what is the %G + C within the Aspergillis DNA?
A) 0% B) 25% C) 50% D) 75% E) The answer cannot be determined from this information.
The purpose of the Calvin cycle is to
a. produce sugars using CO2 as a carbon source. b. recover electrons lost when water was split. c. capture photons of light. d. counteract increasing atmospheric CO2 concentrations (global warming). e. generate O2 gas for cellular respiration.
Which of the following statements concerning hydrocarbons is false?
A) Octane is a hydrocarbon. B) Hydrocarbons are insoluble in water. C) Hydrocarbons are the most abundant organic molecules in cells. D) Only hydrogen atoms are used to complete the valence requirements of carbon in hydrocarbons. E) Phospholipids have hydrocarbon tails.