Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

1. Introduction to Biochemistry

Carbohydrates

Biochemistry

1. Introduction to Biochemistry

Carbohydrates

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Multiple Choice

Which of the following characteristics best describes a carbohydrate?

It is a polymer of amino acids linked by peptide bonds.

It is a hydrophobic molecule composed mainly of long hydrocarbon chains.

It is a nucleic acid containing a phosphate backbone and nitrogenous bases.

It is an organic molecule composed primarily of carbon, hydrogen, and oxygen in a 1:2:1 ratio.

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Verified step by step guidance

Step 1: Begin by understanding the definition of a carbohydrate. Carbohydrates are organic molecules composed primarily of carbon (C), hydrogen (H), and oxygen (O) atoms, typically in a 1:2:1 ratio. This ratio is a key characteristic of carbohydrates.

Step 2: Compare the given options to the definition of a carbohydrate. Eliminate options that describe other macromolecules, such as proteins, lipids, or nucleic acids.

Step 3: Analyze the first option: 'It is a polymer of amino acids linked by peptide bonds.' This describes proteins, not carbohydrates, as proteins are made of amino acids connected by peptide bonds.

Step 4: Analyze the second option: 'It is a hydrophobic molecule composed mainly of long hydrocarbon chains.' This describes lipids, which are hydrophobic and primarily composed of hydrocarbon chains, not carbohydrates.

Step 5: Analyze the third option: 'It is a nucleic acid containing a phosphate backbone and nitrogenous bases.' This describes nucleic acids, such as DNA and RNA, not carbohydrates. The correct answer is the fourth option: 'It is an organic molecule composed primarily of carbon, hydrogen, and oxygen in a 1:2:1 ratio,' which matches the definition of carbohydrates.