Where are the fungal hyphae in a mycorrhiza?
a. the space between the cell wall and the plasma membrane of root cells.
b. in the cytoplasm of root cells.
c. on the surface of plant stems, above ground.
d. within the vasculature of the leaves of a plant.
e. on the outside of the cell wall of root cells.
a
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Chemicals in tobacco smoke can cause
a. DNA to break into pieces. b. mispairing of bases. c. kinking in the DNA molecule. d. the formation of nucleotide dimers. e. covalent bonding between adjacent adenine bases.
One feature shared by modern humans and lacking in other Homo species is ____
a. a chin b. a large brain c. bipedalism d. tool making e. legs longer than arms
The rapid increase in the population of Canada geese in the United States can be primarily attributed to ____
a. an increase of crop predation b. a decrease in avian diseases c. the suspension of hunting geese for many years d. an increase in wetlands e. an increase in the number of nonmigratory geese
Temporal isolation and mechanical isolation are reproductive isolating mechanisms that are classifiedas:a
homozygotic barriers. b. prezygotic barriers. c. heterozygotic barriers. d. postzygotic barriers. e. homozygotic barriers.