Explain why Mendel choose seven different varieties of pea plants for his experiments. What will be an ideal response?
ANSWER: Mendel chose seven different varieties of pea plants because each had a different,
distinguishing characteristic called a trait. Each trait was represented by two variations: For
example, plant height is the trait, tall and short are the variations; pea shape is the trait, and
the variations are wrinkled and smooth peas; and so forth. In his experiments, he wanted to
see how traits such as height or pea shape were passed from generation to generation.
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The disinfectant of choice for municipal water supplies is ________.
A. ultraviolet light B. either fluorine or chlorine C. fluorine D. chlorine
Looking at the figure above, what can be said about edge effects?
A) Biomass declines along edges of forest fragments. B) Biomass increases along the edges of forest fragments. C) Species diversity decreases along the edges of forest fragments. D) Fragmentation does not affect biomass.
In transcription, one DNA strand is transcribed into a(n) ________ RNA strand, which is translated into protein.
A) ribosomal B) transfer C) messenger D) anticodon
In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because
A. each hormone can bind to multiple receptors simultaneously causing amplification of the signal. B. the signal is amplified by activation of transcription factors that each catalyze multiple reactions. C. the hormone triggers the cell to release more hormones, amplifying the signal. D. the signal is amplified by activation of enzymes that each catalyze multiple reactions. E. each hormone can bind to transcription factors simultaneously causing amplification of the signal.