_________ occurs when 50% of a protein produces a different phenotype than that produced by 100% or 0% of the protein.
A. Incomplete dominance
B. Recessive inheritance
C. Codominance
D. Loss of function mutation
E. Hybridization
A. Incomplete dominance
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Indicate whether the statement is true or false.
How does the fossil record provide evidence for evolution?
a. By showing similarity of structures in organisms that show the same basic form b. By showing the convergence of forms in living organisms c. By showing the similarity of DNA sequences of related organisms d. By determining the age of fossils, the fossil record shows the evolution of form over millions of years
Which of the following is the best description of decomposition?
a. breaking down inorganic molecules such as carbon dioxide and water into organic molecules such as carbohydrates, lipids, and proteins b. building organic molecules such as carbohydrates, lipids, and proteins from inorganic molecules such as carbon dioxide, water, and nitrogen-containing compounds c. building macromolecules from smaller organic molecules d. breaking down organic molecules into inorganic molecules e. a process undertaken by producers in an ecosystem
What was the probable role of oxygen gas in the early stages of life's appearance on Earth?
A) Cellular respiration, which depends on oxygen availability, provided abundant energy to the first life-forms. B) Oxygen promoted the formation of complex organic molecules through physical processes. C) Oxygen gas tends to disrupt organic molecules, so its absence promoted the formation and stability of complex organic molecules on the early Earth. D) Abundant atmospheric oxygen would have created an ozone layer, which would have blocked out ultraviolet light and thereby protected the earliest life-forms.