Sickle cell anemia is a genetic disease caused by the replacement of one amino acid in the hemoglobin molecule. This
replacement changes the shape and function of the hemoglobin protein in dramatic ways, which can sometimes be lethal.
How can the substitution of one amino acid lead to such drastic results? What will be an ideal response?
Concepts to Consider: Amino acid sequence determines primary structure; primary
structure affects the shape of proteins; the shape of proteins determines their function
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Angiosperms possess many adaptations. Which of the following statements is not true of angiosperms relative to other groups of plants?
A. Angiosperms have xylem vessels. B. Angiosperms rely entirely on tracheid xylem. C. Angiosperms have much higher rates of CO2 uptake than other groups of plants. D. Angiosperms transformed the terrestrial environment due to their metabolic activities. E. Angiosperms can support greater rates of photosynthesis and transpiration than other groups of plants.
Which of the following are greenhouse gases? Check all that apply.
_____ water vapor _____ molecular oxygen _____ molecular nitrogen _____ methane _____ nitrous oxide
Mosses have stems, roots, and leaves
____________________ Indicate whether the statement is true or false.
In some species, such as Steller sea lions, a sexual polymorphism for longevity is observed, with females liv-ing on average several years longer than males. Use an evolutionary explanation of senescence to explain this polymorphism
a. Males have a higher mutation rate than females. b. Males have higher age-specific fertility at older ages than females. c. Sexual selection imposes a more severe trade-off between fitness and longevity in males than in females. d. Males do not need to live as long as females to attain the same fitness.