What is the consequence of a mutation in the recA gene in bacteria?
What will be an ideal response?
The wild-type product of recA is required for bacterial recombination to occur at an appreciable level. Absence of the recA protein diminishes recombination by about 1000-fold.
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Which amino acid(s) is/are found only in the cell walls of bacteria?
A. Glycerol B. L-form of glycine C. Diaminopimelic acid D. L-form of methionine E. L-form of glycine AND L-form of methionine
What unconsumed macromolecule from dead organisms eventually formed fossil fuels?
What will be an ideal response?
Some species of plants cannot interbreed by pollinating each other because the sexual structures of the one species ripen and mature at a different time from the other. This genetic isolating mechanism is
A. geographic. B. seasonal isolation. C. habitat preference. D. behavioral.
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.