Biology: The Unity and Diversity of Life (MindTap Course List)
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 3, Problem 2DAA
Summary Introduction

To explain: The group that had the lowest level of HDL (“good” cholesterol).

Concept introduction: Lipoproteins are carriers of hydrophobic molecules, in the extracellular matrix and the blood. They are made of phospholipids, cholesterol, and proteins. Proteins are made of amino acids. Low density lipoprotein (LDL) transports fat, essentially cholesterol molecules, in an aqueous medium. HDL carries cholesterol to the liver for breaking it down to simple forms, where it is converted into bile acids and sent to the intestine for excretion. Trans fatty acids or trans-unsaturated fatty acids or trans fats are fatty acids that have carbon-carbon double bonds with trans configuration. Trans fats have unusual trans configuration.

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Cholesterol that is made by the liver or that enters the body from food does not dissolve in blood, so it is carried through the bloodstream by lipoproteins. Low-density lipoprotein (LDL) carries cholesterol to body tissues such as artery walls, where it can form deposits associated with cardiovascular disease. Thus, LDL is often called "bad" cholesterol. High-density lipoprotein (HDL) carries cholesterol away from tissues to the liver for disposal, so HDL is often called "good" cholesterol.   LDL levels were highest in the diet containing primarily ______.   A. cis fatty acids   B. saturated fats   C. trans fatty acids
Lipoproteins are relatively large, combined clumps of both protein and lipid molecules that circulate in the blood of mammals. They come in two forms, called HDL and LDL, and they act like suitcases to move cholesterol, fatty acid remnants, triglycerides, and phospholipids from one place to another through the bloodstream. (LDL recirculates lipids throughout the body, while HDL takes lipids to the liver to excrete them in feces.) Given that lipids are hydrophobic and proteins can be hydrophilic, which of the following statements is correct? (a) The lipid portion of LDL does not dissolve in the bloodstream, while the lipid portion of HDL does. (b) The protein portions of both LDL and HDL can dissolve or interact with the water molecules in the bloodstream. (c) Neither the protein nor the lipid portions of LDL molecules can interact with water molecules in the bloodstream. (d) Both the protein and the lipid portions of HDL molecules can interact with water molecules in the bloodstream.…
Transport of lipids in blood involve lipoproteins which includes the LDL and HDL commonly referred to as the “good and bad cholesterol” respectively.  True  False
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