The most common isotope of carbon has an atomic number of 6 and a mass number of 12, while the most common
isotope of oxygen has an atomic number of 8 and a mass number of 16. A molecule of CO2 made up of these common
isotopes has a molecular weight of ____.
a. 28
b. 44
c. 56
d. 14
e. 22
ANSWER: b
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Which of the following is a phototroph?
A) a tree B) a mushroom C) bacteria growing on decomposing matter D) an earthworm E) a person
Callaway and Aschehoug's study concluded that an invasive Eurasian grass species can outcompete native North American grasses through
A. secretion of allelochemicals. B. producing more viable seeds. C. producing seeds year-round. D. anti-herbivore compounds. E. faster seed germination.
Which of the following does not always alter the activity of the enzyme?
a. temperature b. pH c. reactant concentrations d. inhibitors e. lack of required cofactors
The aphotic zone of a lake is inhabited primarily by phytoplankton
Indicate whether the statement is true or false