________ use electrons from reduced inorganic or organic compounds as a source of energy and CO2 as a source of carbon.
a) Photoautotrophs
b) Photoheterotrophs
c) Chemoautotrophs
d) Chemoheterotrophs
Answer: c) Chemoautotrophs
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The ____ of a bird's digestive system contains sand and rocks to aid in mechanical digestion
a. crop b. esophagus c. gizzard d. intestine e. mouth
The inorganic nonprotein components that participate in enzyme catalysis are known as
A. products. B. coenzymes. C. substrates. D. cofactors. E. reactants.
Which of the following is most likely to be true about the mouse and rat myosin genes?
A. The nucleotide sequences are identical. B. There is no homology between the two sequences. C. The genes are similar in sequence, but not identical. D. The genes encode proteins with different functions. E. The genes encoding myosin closely resemble those encoding actins.
The process of change that produces the diversity of life on Earth is called
A. levels of organization. B. biological classification. C. evolution. D. acclimation. E. homeostasis.