Which of the following statements describes the
value of fungi in the environment?
a. Fungi “fix” nitrogen from the air for use by
plants.
b. Fungi trap sunlight energy in the form of
carbohydrates.
c. Fungi release elements from organic matter.
d. Fungi enrich the soil by decreasing the rate of
decay of organic matter.
e. Fungi remove toxic metals from the soil.
Answer: c
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Which of the following traits is not seen in any species of lamprey?
a. backbone b. jaws c. oral disk with keratinized teeth d. metamorphosis
A pine tree is called a sporophyte because it
a. develops from a germinated spore. b. produces spores by meiosis. c. is haploid. d. undergoes fertilization. e. reproduces by both sexual and asexual means.
How do scientists estimate the atmospheric levels of carbon dioxide that existed on Earth hundreds or thousands of years ago?
A) They deduce it from the carbon dioxide content of fossil fuels. B) They measure it from bubbles of gas trapped in Antarctic ice. C) They estimate it from the relative numbers of carbon-based life forms that existed over time. D) They measure it from erupting volcanoes, bubbling hot springs, and seeping hydrothermal vents.
HIV attaches to T-cell and macrophages by means of an interaction between gp120 and a(n) (antibody/CD4/gp41) receptor.
Fill in the blank(s) with the appropriate word(s).