Consider the metabolism of a chlorophyll-based phototroph. In oxidative phosphorylation during cell respiration, the source of energy is ________ whereas in photophosphorylation the source of energy is ________.
A. ATP; light
B. highly reduced organic compounds; light
C. NADH; NADPH
D. electron transport chain; chlorophyll
Answer: B
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Choose the true statements about the diversity of Darwin's finches on the Galápagos Islands. Check all that apply.
_____ All of the finch species share a common ancestor that colonized the islands. _____ Prior to the adaptive radiation of finches, there were no unoccupied habitats in the Galápagos Islands. _____ Competition among finches for food sources led to character displacement of beak shapes. _____ Beak shape is not an important key innovation.
When all continents were fused into one during the Permian Period, they were called
a. Laurasia. b. Pangaea. c. Gondwanaland. d. Eurasia. e. Amerasia.
The theory illustrated by Figure 21-1 is used to explain the origin of:
a. anaerobes. b. prokaryotes. c. eukaryotes. d. vascular plants. e. protobionts
Which of the following cell types conducts water most rapidly through a plant?
A. sieve tubes B. phloem C. vessel members D. parenchyma cells E. sclerenchyma cells