What do both triglycerides and phospholipids have in common

1. What do both triglycerides and phospholipids have in common?Two fatty acid chainsThree fatty acid chains
   · Single glycerol molecule

·

· Phosphate group

2. What differs in the structure of trigycerides and phospholipids?

· The number of molecules bonded to glycerol

· The number of fatty acid chains

· The number of glycerol molecules

· The composition of the fatty acid chains

3. At room temperature, coconut oil is a very soft white paste. What type of fats make up the majority of coconut oil’s composition?

· Unsaturated fats

· Saturated fats

4. Which of these pairs are correctly matched? Choose all that apply.

· Phospholipids-cell membranes

· unchecked

· Phospholipids-storage

· unanswered

· Triglycerides-cell membranes

· unanswered

· Triglycerides-storage

· unanswered

5. Why are saturated fats solid at room temperature?

· They contain three fatty acid tails instead of two.

· The double bonds in the fatty acid tails hold the molecules within the triglyceride together with more force.

· There are no double bonds in the fatty acid tails, allowing them to pack more tightly together.

· They have are fully nonpolar, meaning they cannot interact with water and must be a solid.

1. True or false: A phospholipid is one type of triglyceride.

· True

· False

2. Which of these pairs are correctly matched? Choose all that apply.

· Phosphate group-nonpolar

· unanswered

· Fatty acids-nonpolar

· unanswered

· Fatty acids-polar

· unanswered

· Phosphate group-polar

· unanswered

3. What does the prefix “hydro-” mean?

· Oily

· Loving

· Dense

· Water

4. Which of the statements correctly describe phospholipids in the cell membrane? Choose all that apply.

· Phospholipids organize into one layer with phosphate groups toward the outside and fatty acid chains toward the cytoplasm.

· unanswered

· Fatty acid chains from each layer are “sandwiched” in the middle away from water in and out of the cell.

· unanswered

· Phospholipids arrange in two layers.

· unanswered

· Phosphate head groups from each layer are “sandwiched” in the middle away from water in and out of the cell.

The Correct Answer and Explanation is :

Correct Answers:

1. Single glycerol molecule
2. The number of fatty acid chains
3. Saturated fats
4. Phospholipids – cell membranes, Triglycerides – storage
5. There are no double bonds in the fatty acid tails, allowing them to pack more tightly together.
6. False
7. Fatty acids – nonpolar, Phosphate group – polar
8. Water
9. Fatty acid chains from each layer are “sandwiched” in the middle away from water in and out of the cell.
   Phospholipids arrange in two layers.

Explanation:

1 & 2: Triglycerides vs. Phospholipids
Both triglycerides and phospholipids contain a single glycerol molecule, which serves as the backbone to which fatty acid chains and other groups attach. However, triglycerides have three fatty acid chains, while phospholipids have only two, with the third position occupied by a phosphate group. This difference impacts their function—triglycerides store energy, while phospholipids are structural components of membranes.

3: Coconut Oil Composition
Coconut oil is composed mainly of saturated fats, which means its fatty acids lack double bonds, making them more solid at room temperature.

4: Biological Roles of Lipids
Phospholipids are a major component of cell membranes, forming the lipid bilayer. Triglycerides function primarily as energy storage molecules, stored in adipose (fat) tissue.

5: Why Saturated Fats Are Solid
Saturated fats have no double bonds, allowing their hydrocarbon chains to pack closely together through van der Waals forces, making them solid at room temperature.

6: Are Phospholipids Triglycerides?
No, phospholipids are not a type of triglyceride because they have a distinct structure and function.

7: Polarity in Lipid Molecules
Fatty acids are nonpolar, meaning they do not interact with water. In contrast, phosphate groups are polar, enabling interaction with water molecules.

8: Meaning of “Hydro-“
The prefix “hydro-“ means water.

9: Phospholipid Bilayer Structure
In the cell membrane, phospholipids arrange into a bilayer, with hydrophobic fatty acid tails sandwiched in the middle and hydrophilic phosphate heads facing outward toward water.