Plants help reduce flooding by
A) removing soil.
B) breaking down the soil.
C) decreasing the amount of water returned to the air.
D) increasing CO2 levels.
E) increasing the soil's ability to hold water.
E
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Chemicals, secreted by soil fungi, which inhibit the growth of bacteria, are known as _____
A) antibodies B) aflatoxins C) hallucinogens D) antigens E) antibiotics
Complex multicellularity in plants and animals evolved independently. Which of the following features would you expect to be different between plants and animals because of their independent evolution of complex multicellularity?
A. The mechanism by which plants and animals obtain energy would be expected to be different because of the different origin of multicellularity. B. Cell-cell adhesion molecules would be different in animals and plants. C. Plants would have cell walls, but animal cells would not. D. A significant difference in size between the two groups of multicellular organisms would be expected.
How does water pass through membranes?
a. facilitated diffusion b. Water cannot pass through membranes. c. passive diffusion d. active transport
There are nine coat colors known in foxes. If a red
fox were crossed with a double-black fox, all the hybrids would be red above and black below in a pattern known as blended cross. If two blended crosses were mated, the F2 ratio would be as follows: 1 red, 2 smoky red, 2 cross red, 4 blended cross, 1 standard silver, 2 substandard silver, 1 Alaskan silver, 2 sub-Alaskan silver, and 1 double black. (a) Using the letters A/a and B/b to serve as the genes for these animals, develop a genotype for each variety listed. (b) Two crosses will produce all blended-cross offspring. One is used above (red fox x double black); what is the other? (c) List the genotype and phenotype of all the pure-breeding foxes. (d) Give the genotypic and phenotypic ratio of a cross between two substandard silvers. (e) Give the genotype and phenotype of the offspring produced in a cross of a sub-Alaskan silver and a cross red. What will be an ideal response?