The disease osteoporosis involves loss of both mineral and organic components from bones. Factors that may contribute to the development of osteoporosis include
A. lack of calcium and vitamin D in the diet.
B. excess fat in the diet.
C. prolonged disuse of muscles.
D. a history of extreme sport participation.
E. a decline in estrogen following menopause in women.
Answer: E
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In what ways are oxidative phosphorylation and photophosphorylation similar?
A. The source of energy is highly reduced organic compounds B. Proton motive force is generated C. ATP synthase enzyme phosphorylates ADP to make ATP D. An electron transport chain is used E. Water is split to provide electrons
The serial endosymbiosis hypothesis states that the origin of mitochondria and chloroplasts was the
result of a mutually advantageous symbiotic relationship between two eukaryotic organisms. ___________ Indicate whether the statement is true or false.
The observation that most aquatic animals, like fish, penguins, and whales, all have streamlined bodies and fins or flippers for steering are a result of
A. sexual selection. B. artificial selection. C. analogous selection. D. vestigial selection. E. convergent evolution.
Which statement provides evidence for the endosymbiont hypothesis?
a. Atmospheric oxygen can combine with iron atoms to form deposits of iron oxide. b. Many-celled algae would have been difficult for single-celled predators to engulf for food. c. The fossils of animals first appear in Precambrian rocks that are around 500 million years old. d. Some cells evolved the ability to use the energy found in inorganic molecules to drive the synthesis of complex molecules from simple ones. e. Mitochondria, chloroplasts, and centrioles in eukaryotic cells each contain their own minute and unique supply of DNA.