Which statement is true?

A. Carbohydrates are made of amino acids.Incorrect. The monomer of carbohydrates are monosaccharides.

B. Lipids are made of monosaccharides.Incorrect. Lipids are made of glycerol and fatty acids.

C. Nucleic Acids are made of nucleotides. Correct! The building blocks of nucleic acids are nucleotides.

D. Proteins are made of nucleic acids. Incorrect. Proteins are made of amino acids.

Which of the following combinations of organic compound is incorrectly matched with its function?

A. Carbohydrate – main source of energy for living things Incorrect. Carbohydrates are the main source of energy for living things. The question stem asks you to find the combination that is incorrectly matched.

B. Lipid - storage of energy and transport of materials in and out of a cell Incorrect. Lipids primary function is the storage of energy and the transport of materials into out of a cell. The question stem asks you to find the combination that is incorrectly matched.

C. Protein – provides energy for the cell Correct! The question stem asked for the incorrect match. Proteins main function is structure and support.

D. Nucleic acid – stores and transmits genetic information Incorrect. Nucleic acids to store and transmit genetic information. The question stem asks you to find the combination that is incorrectly matched.

The diagram is an example of a molecule that is insoluble in water and is a major component of cell membranes. This diagram illustrates a(n) _____

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A. nucleic acid Incorrect. This is not a nucleic acid. Look again closely at the structure; notice the long chains of carbon and hydrogen atoms. Also, the stem states that this biomolecule is a major component of cell membranes; nucleic acids are not a major component of cell membranes.

B. lipid Correct! This diagram does illustrate a lipid. Lipids are insoluble in water and a major component of cell membranes. Lipids can be easily identified by the long chains of carbon and hydrogen.

C. protein Incorrect. This diagram does not illustrate a protein. This one is tricky because proteins are a component of cell membranes. But, look again closely at the diagram; notice the long chains of carbon and hydrogen atoms.

D. carbohydrate Incorrect. This diagram does not illustrate a carbohydrate. Carbohydrates are composed of carbon, hydrogen and oxygen like the biomolecule illustrated here. Notice the long chains of carbon and hydrogen this is a characteristic of another biomolecule. Also, the stem states this biomolecule is a major component of cell membranes. Carbohydrates are not a major component of cell membranes.

Use the diagram and the information below to answer question 4.

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The macromolecule represented is a lipid The macromolecule pictured is the main component of enzymes and hormone The macromolecule is composed of carbon, hydrogen, and oxygen The macromolecule can be broken down into 5 glucose molecules

Which of the following are correct descriptions of the macromolecule pictured?

A. I and III onlyIncorrect. I is not correct as this is not a lipid. III is correct. This macromolecule is composed of carbon, hydrogen, and oxygen.

B. III and IV only Correct! This macromolecule is composed of carbon, hydrogen and oxygen. IV is also correct. The macromolecule can be broken down into 5 glucose molecules.

C. III only Incorrect. III is correct. This macromolecule is composed of carbon, hydrogen and oxygen. BUT is this the only statement that is correct?

D. II and IV only Incorrect. II is not correct. This molecule is not the main component of enzymes and hormones. IV is correct. The macromolecule can be broken down into five glucose molecules.

A student was asked to identify three unknown substances and determine which substance a person would want to consume the night before running a marathon so that they had a large energy supply available for the run. His data is displayed below.

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After analyzing the data, the student concluded that the person would want to eat substance A the night before a race.

Was the student correct in his conclusion and why?

A. Yes, the student was correct because the main function of lipids is energy supply. Incorrect. Lipids main function is not energy supply.

B. No, the student was not correct. He should have chosen B because proteins are the main source of energy for living organisms. Incorrect. Proteins are not the main source of energy for living organisms.

C. No, the student was not correct. He should have chosen substance C because the main function of carbohydrates is energy supply for living organisms. Correct! Carbohydrates are the main source of energy for living organisms

D. No, the student was not correct. He should have chosen substance D because it contains both lipids and proteins. Incorrect.


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Lipids and proteins are not the main source of immediate energy for living organisms.