Different kinds of mycorrhizae occur in different ecosystems. For example, as you walk up a mountain, you might find one type of mycorrhizae in lower regions and a second, different type of mycorrhizae in higher regions. Why are there mycorrhizae
specific to certain ecosystems?
A) Mycorrhizae are adapted to the altitude.
B) Mycorrhizae are adapted to the type of slope of the land.
C) Mycorrhizae tend to colonize all levels of the mountain.
D) Mycorrhizae are adapted to the type of soil and the type of vegetation present.
Answer: D
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Baleen plates are composed of:
a. calcium carbonate. b. cellulose. c. keratin. d. chitin. e. silica.
Each of the following is true regarding cancer cell metastasis to secondary sites except
A) cancer cells may multiply in regional lymph nodes if they enter via lymphatics. B) many cells from the primary mass may enter circulation. C) all cancer cells circulating in the bloodstream are identical. D) few cancer cells survive in the bloodstream. E) the population of cancer cells is heterogeneous.
A person is genetically XX and develops as a male. How can this be explained?
a. In humans, males are XX. b. An error in karyotyping this individual must have occurred because XX individuals cannot develop into a male. c. A piece of a Y chromosome has become attached to one of the X chromosomes. d. The SRY gene was deleted in this individual.
Which property of water molecules is responsible for movement of water from roots to leaves in a plant?
a. hydrophobicity b. temperature stability
c. fusion d. solvent polarity e. cohesion