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Which group consists entirely of organic molecules?*
Organic compounds are used as building blocks for*
Base your answers to questions 3 on the diagram below and on your knowledge of biology. The dia- gram represents a portion of a starch molecule.
The building blocks for this molecule are*
Proteins, starch, and DNA are similar in that they are all*
The major role of carbohydrates in the human diet is to*
The two diagrams below represent a sugar molecule and a fat molecule that are used by living organisms.
Which statement best describes these two molecules?*
More energy can be released from a fat molecule than from a glucose molecule because the fat molecule contains more*
Organisms contain compounds such as proteins, starches, and fats. The chemical bonds in these compounds can be a source of*
Fat molecules typically contain long chains of carbon atoms. Animals tend to store fats for use when food resources are scarce. This is an advantage to the animal because*
Base your answers to questions 10 on the diagram below and your knowledge of biology. The diagram represents an ameba, a single-celled organism, carrying out an essential life process.
This process is essential to the survival of the ameba because it*
In the cells of the human body, oxygen molecules are used directly in a process that*
Nutrients in a diet, such as proteins, carbohydrates, and minerals, play an important role in homeostasis within the human body. Lack of these nutrients can lead to malfunctions that disrupt this internal balance. Explain how diet can influence homeostasis. In your answer, be sure to:
• select a nutrient from the passage and write it on the line below and state one role this nutrient plays in the body 
• describe, using one specific example, how a decrease in this nutrient can alter homeostasis 
Base your answers to questions 14 on the information below and on your knowledge of biology.
Hydrothermal Vent Communities
Scientists discovered a unique hydrothermal ecosystem on the sea floor at hot-water vents thousands of feet below the ocean surface. Organisms in these deep-sea regions have no access to sunlight, so they depend on the heat, methane, and high levels of sulfur-bearing minerals found in the heated fluids in which they live. Scientists were amazed to discover vent communities able to sustain vast amounts of life. The vent organisms depend on bacteria that can use the sulfur-bearing minerals to produce organic materials. These bacteria live on rock surfaces and as free-floating blobs. Some bacteria live within and provide nutrients for an unusual species of giant tubeworms that lacks a digestive system. Snails, shrimp, and clams are among the animals that feed directly on the bacteria. Crabs feed directly on other animals in the vent community.
Describe one way the bacteria of the hydrothermal vent community differ from plants in their ability to produce organic materials. *
Base your answers to questions 15 on the information and diagram below and on your knowledge of biology.
Blood is a fluid tissue, which means that blood cells are suspended in a fluid called plasma. Blood tests are concerned with not only the number of blood cells present, but with the amount of plasma that surrounds the cells.
The diagram below represents tubes containing blood samples from an athlete before and after blood doping. Blood doping is an illegal practice reportedly used by some athletes a few weeks before an athletic event, and involves removing whole blood from an athlete, separating the oxygen-carrying red blood cells (RBCs), and then freezing them. These RBCs are thawed and returned to the athlete’s body just before the athlete competes. Serious health risks are associated with this practice.
Explain why athletes who practice blood doping would be expected to perform better at an athletic event. *
Base your answer to question 16 on the information below and on your knowledge of biology.
A student measured oxygen and carbon dioxide concentration levels in an aquatic ecosystem during a 24 hour period. The data are represented in the graph below.
Identify two biological processes that are responsible for the production of varying amounts of carbon dioxide and oxygen within the aquatic ecosystem. 
Processes: ____________________________________ and ____________________________________*