In some species, sex determination is influenced by environmental temperature during development. If you wanted to determine the temperature at which one would obtain a 1:1 sex ratio in a particular species of turtle, which of the following experiments would best address this question?
A. Grow the turtles in three different incubators at temperatures of 26ºC, 28ºC, and 30ºC.
B. Grow the turtles in five different incubators at temperatures of 22ºC, 24ºC, 26ºC, 28ºC, and 30ºC.
C. Grow the turtles in two different incubators at temperatures of 22ºC and 30ºC.
D. Grow the turtles in four different incubators at temperatures of 24ºC, 26ºC, 28ºC, and 30ºC.
Answer: B
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Bacterial cells are placed into a 250mL liquid growth medium in a closed laboratory flask. According to Malthusian theory, they will reproduce exponentially and then:
A. continue reproducing arithmetically as long as there are no limitations on food supply. B. continue reproducing geometrically as long as there are no limitations on food supply. C. continue reproducing arithmetically until the food supply is used up, then they will cease to grow. D. continue reproducing geometrically until the food supply is used up, then they will cease to grow.
According to evidence from ice layers from the
Antarctic, atmospheric carbon dioxide levels have been rising since
a. the dinosaurs went extinct. b. for the last 10, 000 years. c. the industrial revolution began. d. the 1970s. e. human evolved 200, 000 years ago.
High density lipoproteins
a. carry cholesterol to the liver. b. line the artery walls. c. are used for nutrition. d. lower blood pressure. e. carry cholesterol and other fats to body cells.
Assume that two parents with normal vision have a son who has red-green color blindness. Which parent is responsible for the son's color blindness?
a. the mother b. the father c. either parent d. None of these are correct.