Altering an organism's phenotype by ________ is a technique for determining the function of a gene.
A. gene therapy
B. gene knockout
C. probe analysis
D. expression vector cloning
E. FISH
Answer: B
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Abscisic acid is an important signal, transported from roots to the stem and leaves during times of water stress, that prevents
A. additional auxin production. B. ethylene buildup in the stems. C. leaf drop. D. phototropism. E. stomatal opening.
__________ selection favors intermediate forms of a trait where __________ selection favors extreme forms. Fill in the blank(s) with the appropriate word(s)
A rabbit taken from a meadow near sea level and moved to a meadow high on a mountainside would have some trouble breathing. Why?
A) The percentage of oxygen in the air at high elevations is lower than at sea level. B) The percentage of oxygen in the air at high elevations is higher than at sea level. C) The partial pressure of oxygen in the air at high elevations is lower than at sea level. D) The partial pressure of oxygen in the air at high elevations is higher than at sea level.
Which of these groups is often lumped into the reptiles?
a. fish b. amphibians c. birds d. mammals