Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents?
A) XnXn and XnY
B) XNXN and XnY
C) XNXN and XNY
D) XNXn and XNY
D
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Imagine you have extracted myosin molecules from both fast and slow twitch muscle fibers and are measuring the rate at which these proteins hydrolyze ATP. What would these relative rates of ATP hydrolysis be?
A. fast twitch fiber > slow twitch fiber B. slow twitch fiber > fast twitch fiber C. slow twitch fiber = fast twitch fiber
Root hairs are similar to mycorrhizae in that both
a. are multicellular. b. are extensions of root epidermal cells. c. are symbiotic relationships involving root cells. d. increase the surface area available for absorption. e. fit all of these descriptions.
Learning is most common in animals that
A. are large. B. have large brains. C. live in complicated environments. D. must communicate in order to reproduce.
What is theprimary purpose of a phylogenetic tree?
a. The primary purpose of a phylogenetic tree is to be able to develop species and genus names of new discovered organisms. b. The primary purpose of a phylogenetic tree is to be able to trace evolutionary relationships amongst organisms. c. The primary purpose of a phylogenetic tree is to be able to determine which organisms are more advanced than others. d. The primary purpose of a phylogenetic tree is to be able to determine into which kingdom a living organism belongs.