The layer of cells called the endoderm in the developing embryo eventually gives rise to
A. connective tissue and muscle.
B. hair and nails.
C. the lining of the gut and associated organs.
D. the epidermis and nervous system.
Answer: C
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Observe the photomicrograph on the right of an organism that was found growing symbiotically within the leaves of the water fern Azolla
(a) What is the common name given to an organism of this type? (b) Give the name and function of the cell depicted by the line.
There is great diversity of shape among microbes. Form is one of the ways different taxa can be distinguished. Which of the following shapes are not found among the microbes?
A. rods B. spheres C. octagons D. curved shapes E. spirals
Which of the following types of interactions is advantageous for one species, but has no effect on the
other?
a. commensalism b. herbivory c. mutualism d. parasitism e. predation
Lichens, a combination of fungi and certain algae, live together in a close community interaction. The traditional understanding of lichen is one where the algae produces food for the fungi and the fungi supply the algae with a suitable home. Recently, however, it was found that the algae can live just fine on their own and are also found living "alone" in nature. The fungi on the other hand do
not appear to live on their own in the "wild." Which type of interaction characterizes the "traditional" understanding of lichen? Why? Which type of interaction does the new research suggest? Why? What will be an ideal response?