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Chapter 24: Problem 73

Indicate whether each statement is true or false: (a) Fat molecules must contain \(\mathrm{C}=\mathrm{C}\) bonds. (b) Phosphoplipids have overall net charge. (c) Cis-monounsaturated fat molecules are bent in shape.

Short Answer

Expert verified
(a) FALSE - Fat molecules can be saturated (with only C-C bonds) or unsaturated (with at least one C=C bond). (b) TRUE - Phospholipids have a negatively charged phosphate group in their hydrophilic head, which may interact with positively charged groups to result in a net charge. (c) TRUE - Cis-monounsaturated fat molecules are bent in shape due to the geometry of the C=C double bond where hydrogen atoms are on the same side.

Step by step solution

01

Statement(a): Fat molecules must contain C=C bonds.

This statement is FALSE. Fat molecules are primarily composed of two types of structures: saturated and unsaturated. Saturated fat molecules contain only single bonds between carbon atoms (C-C bonds) and are often more solid at room temperature, while unsaturated fat molecules contain at least one double bond between carbon atoms (C=C bonds) and are often liquid at room temperature. Fat molecules can either have C=C bonds or not have them, depending on their type, so fat molecules do not necessarily have to contain C=C bonds.
02

Statement(b): Phospholipids have overall net charge.

This statement is TRUE. Phospholipids are molecules that contain a hydrophilic (water-loving) "head" group and hydrophobic (water-repelling) "tail" group. The head group contains a phosphate group, which has a negative charge, and therefore contributes to the overall charge of the molecule. Additionally, the head group may interact with positively charged amine, ethanolamine, or choline groups. These positive and negative charges can add up to a net charge depending on specific structure of the head group in a particular phospholipid molecule.
03

Statement(c): Cis-monounsaturated fat molecules are bent in shape.

This statement is TRUE. In cis-monounsaturated fat molecules, a double bond (C=C) causes a bend in the molecule due to the geometry of the carbon atoms and their bonding. In these molecules, the hydrogen atoms bound to the double-bonded carbons are on the same side, which is responsible for the bent structure. This bent shape has an impact on the physical properties of the molecule, like its melting point and viscosity.

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