Unit 1 Review - Pre assessment

Blood sugar levels increase after a meal and eventually return to normal. This is represented in the diagram below. This constant correcting of blood sugar levels within the body is accomplished by

• a feedback mechanism

• an allergic reaction

• manipulating a gene

• an immune response

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NGSS.HS-LS1-3

Changes in external temperatures often result in a person either sweating or shivering, as represented in the diagram below. These responses are one way

• to counteract feedback mechanisms that would otherwise be beneficial

• to make the body release insulin to control blood circulation

• skin and muscle cells are able to disrupt homeostasis

• the body is able to maintain dynamic equilibrium

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NGSS.HS-LS1-3

Which of the following is the most accurate interpretation of this diagram?

• Cellular respiration converts oxygen and glucose into usable energy (ATP), carbon dioxide, and water.

• Oxygen and carbon dioxide are the reactants in cellular respiration, producing glucose and water.

• Glucose and water are broken down to produce oxygen and carbon dioxide during cellular respiration.

• The products of cellular respiration are energy, glucose, and water, with no carbon dioxide produced.

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In a human body, blood sugar levels are regulated by insulin and glucagon. When blood sugar is too high, the pancreas releases insulin, which helps cells absorb glucose, lowering blood sugar levels. When blood sugar is too low, the pancreas releases glucagon, which stimulates the liver to release stored glucose. This process is an example of which type of feedback mechanism?

• Positive feedback

• Negative feedback

• Homeostatic imbalance

• Feedback inhibition

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NGSS.HS-LS1-3

Which statement concerning the functioning of cells is correct?

• Mitochondria transfer energy from organic compounds to form ATP molecules.

• Vacuoles are the sites of DNA synthesis.

• The nucleus stores genes that will later be removed from the cell.

• The cell membrane prevents the diffusion of all poisons into a cell from its environment.

In a changing external environment, an organism must be able to maintain relatively constant internal conditions. This maintenance of a stable internal environment is known as

• transport

• metabolism

• homeostasis

• nutrition

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NGSS.HS-LS1-3