What are the two important symbiotic relationships involving plant roots?
What will be an ideal response?
Mycorrhizae: This relationship between plant roots and fungi allows the roots to absorb more water and nutrients than they could on their own. The fungi benefit from the ready supply of photosynthetically derived food.
Root nodules: This relationship between bacteria and plant roots forms a nodule inside which bacteria can fix atmospheric nitrogen. The bacteria supply some of the fixed nitrogen to the plants, while the bacteria benefit from the ready supply of photosynthetically derived food.
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In an Hfr strain, the F episome is integrated between genes A and B. When this Hfr mates with an F? strain, gene B is always transferred first to the F? cell. What is the last bacterial gene that could possibly (at least in theory) be transferred to the F? from the host chromosome?
A) a gene that is 90 minutes from gene A B) a gene that is at 30 minutes from gene A C) gene A D) a gene that is at 60 minutes from gene A
Endergonic reactions convert molecules with ____ free energy to molecules with ____ free energy, so they require a net energy input in order to proceed
a. higher; lower b. lower; higher c. zero; some d. some; zero e. chemical bond; no chemical bond
Daphnia pulex grows protective armor upon sensing chemicals produced by the predatory phantom midge by the process of ________
A) barrier defense B) inducible defense C) stimulatory defense D) predatory defense
A trend toward the decrease in the size of plants on the slopes of mountains as altitudes increase is an example of
A) a cline. B) a bottleneck. C) relative fitness. D) genetic drift. E) geographic variation.