Question 1

Which is a property of unsaturated fats?

Accepted Answer

A)  They are more common in animals. 
B)  They are generally liquid at room temperature. 
C)  They have no double bonds in the carbon chains of their fatty acids. 
D)  They have fewer fatty acids per fat molecule than do saturated fats. 
E)  They contain more hydrogen than do saturated fats having the same number of carbon atoms. 
A)  They are more common in animals. 
B)  They are generally liquid at room temperature. 
C)  They have no double bonds in the carbon chains of their fatty acids. 
D)  They have fewer fatty acids per fat molecule than do saturated fats. 
E)  They contain more hydrogen than do saturated fats having the same number of carbon atoms.

Question 2

What group of molecules is represented in this structure?

Accepted Answer

A)  structural proteins 
B)  polysaccharides 
C)  triacylglycerols 
D)  phospholipids 
E)  polypeptides 
A)  structural proteins 
B)  polysaccharides 
C)  triacylglycerols 
D)  phospholipids 
E)  polypeptides

Question 3

Which of the following is responsible for the alpha-helical structure of proteins?

Accepted Answer

A)  hydrogen bonds 
B)  ionic interactions 
C)  polar covalent bonds 
D)  hydrophobic interactions 
E)  nonpolar covalent bonds 
A)  hydrogen bonds 
B)  ionic interactions 
C)  polar covalent bonds 
D)  hydrophobic interactions 
E)  nonpolar covalent bonds

Question 4

Methane, which is composed of carbon and hydrogen, lacks functional groups and is a gas at room temperature. Upon replacing one of the hydrogen atoms with a hydroxyl group, methane is converted to methanol, which is a liquid at room temperature. Explain the reason behind this difference in physical properties.

Accepted Answer

Concepts to Consider: Polar na

Question 5

By definition, geometric isomers are mirror images of each other. 
__________________

Accepted Answer

A) True 
 B)False

Question 6

Which description illustrates an amphipathic molecule?

Accepted Answer

A)  A phospholipid with two polar ends 
B)  A phospholipid with two hydrophobic ends 
C)  A phospholipid with only one hydrophilic end 
D)  A phospholipid with only one hydrophobic end 
E)  A phospholipid with both a hydrophobic end and a hydrophilic end 
A)  A phospholipid with two polar ends 
B)  A phospholipid with two hydrophobic ends 
C)  A phospholipid with only one hydrophilic end 
D)  A phospholipid with only one hydrophobic end 
E)  A phospholipid with both a hydrophobic end and a hydrophilic end

Question 7

Figure 3-1   What chemical process is represented in the accompanying figure?

Accepted Answer

A)  hydrolysis 
B)  denaturation 
C)  condensation 
D)  protein synthesis 
E)  dehydration synthesis 
A)  hydrolysis 
B)  denaturation 
C)  condensation 
D)  protein synthesis 
E)  dehydration synthesis

Question 8

You isolate a compound that is insoluble in water, has alternating single and double bonds, and has a bright orange color. You correctly conclude that this compound is a:

Accepted Answer

A)  protein. 
B)  nucleic acid. 
C)  polysaccharide. 
D)  steroid. 
E)  carotenoid. 
A)  protein. 
B)  nucleic acid. 
C)  polysaccharide. 
D)  steroid. 
E)  carotenoid.

Exam 3: The Chemistry of Life Organic Compounds

Which is a property of unsaturated fats?

What group of molecules is represented in this structure?

Which of the following is responsible for the alpha-helical structure of proteins?

By definition, geometric isomers are mirror images of each other. __________________

Which description illustrates an amphipathic molecule?

Figure 3-1 What chemical process is represented in the accompanying figure?

You isolate a compound that is insoluble in water, has alternating single and double bonds, and has a bright orange color. You correctly conclude that this compound is a:

A View of Life

Atoms and Molecules the Chemical Basis of Life

Organization of the Cell

Biological Membranes

Cell Communication

Energy and Metabolism

How Cells Make Atp Energy-Releasing Pathways

Photosynthesis Capturing Light Energy

Chromosomes, Mitosis, and Meiosis

The Basic Principles of Heredity

Dna the Carrier of Genetic Information

Gene Expression

Gene Regulation

Dna Technology and Genomics

Human Genetics and the Human Genome

Developmental Genetics

Introduction to Darwinian Evolution

Evolutionary Change in Populations

Speciation and Macroevolution

The Origin and Evolutionary History of Life

The Evolution of Primates

Understanding Diversity Systematics

Viruses and Subviral Agents

Bacteria and Archaea

Protists

Seedless Plants

Seed Plants

The Fungi

An Introduction to Animal Diversity

Sponges, Cnidarians, Ctenophores, and Protostomes

The Deuterostomes

Plant Structure Growth and Development

Leaf Structure and Function

Stem Structure and Transport

Roots and Mineral Nutrition

Reproduction in Flowering Plants

Plant Developmental Responses to External and Internal Signals

Animal Structure and Function an Introduction

Protection Support and Movement

Neural Signaling

Neural Regulation

Sensory Systems

Internal Transport

The Immune System Internal Defense

Gas Exchange

Processing Food and Nutrition

Osmoregulation and Disposal of Metabolic Wastes

Endocrine Regulation

Reproduction

Animal Development

Animal Behavior

Introduction to Ecology Population Ecology

Community Ecology

Ecosystems and the Biosphere

Ecology and the Geography of Life

Biological Diversity and Conservation Biology

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