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Base your answers to questions 1 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*
The energy released when sugar molecules are broken down is stored in*
In the human body, carbon monoxide reduces the amount of oxygen that can be transported to cells. Breathing in too much carbon monoxide will most likely result in the production of*
The diagram below shows part of the human body with some organs that help to carry out the removal of wastes.
The energy necessary to perform this function comes directly from the*
Base your answers to questions 6 on the information and diagram below and on your knowledge of biology. The diagram represents a plant leaf cell and two different molecules used in the process of glucose synthesis.
Molecules 1 and 2 are most likely*
During cellular respiration, what is the direct source of the energy used in the cells of consumers in the ecosystem represented below?
Which dissolved substance do aquatic animals remove from their external environment for use in cellular respiration?*
It may be harmful when people compete to see who can hold their breath the longest under water. Without oxygen, brain cells*
The diagram below represents a series of events that occur in living cells.
Which molecule is indicated by X?*
During the process of cellular respiration, energy is released from*
Base your answers to questions 12 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 13 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 ____________________________________*
Base your answers to questions 14 on the information and graph below and on your knowledge of biology. The graph shows the change in the blood glucose level of one person after eating a cookie.
Explain why most human cells require a supply of glucose. *
Base your answers to questions 15 on the word equations below and on your knowledge of biology. The equations represent two biochemical processes that occur in living organisms. The letter X represents a molecule produced from process 1.
Process 1: oxygen + glucose → carbon dioxide + water + X
Process 2: carbon dioxide + water → oxygen + glucose
Identify the molecule represented by letter X in process 1. *