Plant cell walls can contain all of the following except
a. Cellulose.
b. Chitin.
c. Lignin.
d. Pectin.
e. Both pectin and lignin.
Ans: b. Chitin.
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Asymmetry, choanocytes, filter feeding, osculum, and spicules are all terms associated with which
phylum?
a. Nematoda b. Ctenophora c. Nemertea d. Porifera e. Cnidaria
Which of the following characteristics distinguishes birds from reptiles?
a. Reptiles have only one single middle ear bone, while birds have two or more. b. The shape of their occipital condyles allows birds to rotate their heads more than reptiles can. c. Birds are endothermic. d. Birds and reptiles have distinctly different jaw bone morphologies.
The effect of resource availability on
population size determines a. the carrying capacity of the environment. b. exponential growth. c. the doubling time of a population. d. the population's biotic potential. e. all of these.
If one was to include in a regression a binary dummy variable for all four regions of the country (East, West, South, North) - what identification challenge would be presented?
A. Perfect multicollinearity B. Variance inflation factor C. Endogeneity problem D. Heteroscedasticity