The substance O2 is considered to be
a. both a molecule and a compound.
b. a compound but not a molecule.
c. neither a molecule nor a compound.
d. a molecule but not a compound.
e. a chemical but not a biological molecule.
D
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A cross is performed between parents with genotypes aaBbCc and aaBbcc. What is the probability that the offspring
will have the same genotype as the first parent? Assume that capital letters indicate dominant alleles and lower case letters indicate recessive alleles.
a. 1/8 b. 1/4 c. 3/8 d. 3/16 e. 9/16
Photosynthesis produces carbon dioxide and oxygen.
a. true b. false
As an overall average, about ______ of the energy at one trophic level is generally available to the next highest rank in the food chain.
A. two percent B. ten percent C. four percent D. seven percent E. twenty percent
Which of the following is NOT a mechanism of genetic change in populations?
a) genetic drift b) mutation c) natural selection d) biogeography e) migration