Plant X is receiving 10 hours of light per day. It needs a day length of less than 11 hours to flower. One day the dark period for plant X was interrupted by a flash of red light. Will plant X flower? Why or why not?
What will be an ideal response?
Plant X is a short-day plant because it requires a day length shorter than a critical period. Plant X will not flower because the critical dark period was interrupted by red light. The red light converted phytochrome red to far-red, therefore signaling the plant that it is daytime. This example illustrates that it is the length of the dark period that actually stimulates flowering.
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Dominance, sexual behavior, and territoriality can all be related in song birds. This is because:a
the establishment of a territory by singing tends to reduce conflict. b. the establishment of a territory encourages use of the entire habitat and regulates the size of the breeding area. c. competing species are eliminated. d. only individuals that successfully defend their territory can mate. e. females sing but males do not.
A new mutation that arose in one copy of gene X in a somatic cell resulted in the formation of a tumor. Which of the following pieces of evidence best describes how the new mutation directly caused the tumor?
A) Protein X normally stimulates cell division, and the mutation created an overactive version of protein X B) Protein X normally activates a growth hormone receptor, and the mutation decreased the stability of protein X. C) Protein X normally prevents passage through the cell cycle, and the mutation created an overactive version of protein X. D) Protein X normally regulates gene expression, and the mutation created an underactive version of protein X that blocked the cell cycle.
Food is sent along the GI tract by means of a wavelike process called ________
Fill in the blank(s) with correct word
What biochemical test is used to distinguish between the Enterobacteriaceae and the Pasteurellaceae?
A) lactose fermentation B) oxidase test C) motility D) pigment production E) Gram stain