Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Lipids

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Lipids

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Problem 16c

Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Lipids contain oxygen and are therefore polar covalent compounds.

Verified step by step guidance

Step 1: Understand the composition of lipids. Lipids are primarily composed of carbon (C), hydrogen (H), and a small amount of oxygen (O). They are hydrophobic (nonpolar) molecules due to their long hydrocarbon chains, which dominate their structure.

Step 2: Analyze the statement. The statement claims that lipids contain oxygen and are therefore polar covalent compounds. While it is true that lipids may contain oxygen, their overall structure is largely nonpolar due to the dominance of hydrocarbon chains.

Step 3: Recall the definition of polar covalent compounds. Polar covalent compounds have an unequal sharing of electrons, leading to partial positive and negative charges. Lipids, however, do not exhibit this property in their hydrocarbon regions, making them nonpolar.

Step 4: Determine the truth of the statement. The statement is false because lipids are not polar covalent compounds despite containing oxygen. Their hydrophobic nature classifies them as nonpolar molecules.

Step 5: Correct the false statement. A corrected version of the statement would be: 'Lipids contain oxygen but are primarily nonpolar molecules due to their long hydrocarbon chains.'

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Lipids

Lipids are a diverse group of hydrophobic organic molecules, primarily composed of carbon and hydrogen, with some containing oxygen. They include fats, oils, and phospholipids, which play crucial roles in energy storage, cellular structure, and signaling. Unlike polar covalent compounds, lipids are generally nonpolar, making them insoluble in water.

Polarity in Chemistry

Polarity refers to the distribution of electrical charge over the atoms in a molecule. Polar molecules have a significant difference in electronegativity between bonded atoms, resulting in a partial positive and negative charge. In contrast, nonpolar molecules, like most lipids, have an even distribution of charge, leading to their hydrophobic nature.

Covalent Bonds

Covalent bonds are formed when two atoms share electrons, allowing them to achieve stability. These bonds can be polar or nonpolar, depending on the electronegativity of the atoms involved. In the context of lipids, the majority of their bonds are nonpolar, contributing to their hydrophobic characteristics and their classification as nonpolar compounds.

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Which of the following substances is a major component of the cell membrane of a fungus?a. celluloseb. chitinc. cholesterold. phospholipids

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Textbook Question

A fat molecule consists of .a. carbohydrates and proteins;b. complex carbohydrates only;c. saturated oxygen atoms;d. a carbon skeleton and fatty acids

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Textbook Question

Another aspect of the Nurses' Health Study looked at the percentage of change in the risk of coronary heart disease associated with substituting one dietary component for another. These results estimated that replacement of 5% of energy from saturated fat in the diet with unsaturated fats would reduce the risk of heart disease by 42%, and that the replacement of 2% of energy from trans fat with unsaturated fats would reduce the risk by 53%. Explain what these numbers mean.

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Textbook Question

Compare and contrast the structures of phospholipids and triglycerides.

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Textbook Question

Considering that water is a main component of the juices in the stomach and intestines, explain why digestion of lipids is more complicated than digestion of carbohydrates and proteins.

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Textbook Question

Explain why monosaccharides are polar and fatty acids are nonpolar even though they both contain the same atoms.

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Multiple Choice

Which type of macromolecule stores energy and provides thermal insulation for the body?

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Multiple Choice

A fat molecule typically contains how many fatty acids?