Describe the colonial theory of animal origins
What will be an ideal response?
The first animals evolved from a colonial protist. At first, all cells in the colony were similar. Each could reproduce and carry out all other essential tasks. Later, mutations produced cells that specialized in some tasks and did not carry out others. Perhaps these cells captured food more efficiently but did not make gametes, whereas others made gametes but did not catch food. The division of labor among interdependent cells made them more efficient, allowing the colonies with mutations to obtain more food and produce more offspring. Over time, additional types of specialized cell types evolved.
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The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is most precisely described as _____
A) metabolic inhibition B) feedback inhibition C) allosteric inhibition D) noncooperative inhibition E) reversible inhibition
Answer the following statements true (T) or false (F)
1. Plants are unable to use nitrogen gas directly. 2. Nitrate reductase is an enzyme that changes nitrogen gas into nitrate. 3. When stomata are closed plants CANNOT absorb CO2, therefore photosynthesis is limited. 4. Nitrogen is especially important in plants for the formation of proteins. 5. Certain fungi help make available minerals such as nitrogen.
Which of the following factors is probably the most important in the success of the reintroduction of wolves in Yellowstone National Park?
A. The cooperation of local residents. B. The genetic diversity in the population. C. The availability of prey species. D. The hybridization of the species with coyotes. E. Both "The cooperation of local residents" and "The availability of prey species."
Which of the following would be likely to require facilitated diffusion to move across the plasma membrane?
a. water (H2O) b. sodium ions (Na+), hydrogen ions (H+), sugars, and amino acids c. oxygen (O2) d. carbon dioxide (CO2)