Question 1

Which type of bond contributes to a protein's secondary structure?

Accepted Answer

A) peptide 
B) covalent 
C) ionic 
D) hydrogen 
E) amine 
A) peptide 
B) covalent 
C) ionic 
D) hydrogen 
E) amine D

Question 2

A carbon atom has how many electron vacancies?

Accepted Answer

A) two 
B) three 
C) four 
D) five 
E) six 
A) two 
B) three 
C) four 
D) five 
E) six C

Question 3

​Which molecule(s), derived from cholesterol, plays an important role in the digestion of fats?

Accepted Answer

A) ​steroid hormones 
B) ​estradiol 
C) ​testosterone 
D) ​bile 
E) ​vitamin D 
A) ​steroid hormones 
B) ​estradiol 
C) ​testosterone 
D) ​bile 
E) ​vitamin D D

Question 4

Sucrose is composed of ____.

Accepted Answer

A) two molecules of fructose 
B) two molecules of glucose 
C) a molecule of fructose and a molecule of glucose 
D) a molecule of fructose and a molecule of galactose 
E) a molecule of glucose and a molecule of galactose 
A) two molecules of fructose 
B) two molecules of glucose 
C) a molecule of fructose and a molecule of glucose 
D) a molecule of fructose and a molecule of galactose 
E) a molecule of glucose and a molecule of galactose

Question 5

Match each biological molecule with the correct description. Some choices may be used more than once.
-structural material for plant and fungi cell walls

Accepted Answer

A) carbohydrates 
B) proteins 
C) lipids 
D) ​nucleic acids 
A) carbohydrates 
B) proteins 
C) lipids 
D) ​nucleic acids

Question 6

​What is the role of DNA?

Accepted Answer

A) ​fatty acid hydrogenator 
B) ​facilitator of biochemical reactions 
C) ​energy carrier 
D) ​carrier of biological information 
E) ​protein synthesizer 
A) ​fatty acid hydrogenator 
B) ​facilitator of biochemical reactions 
C) ​energy carrier 
D) ​carrier of biological information 
E) ​protein synthesizer

Question 7

Match each biological molecule with the correct description. Some choices may be used more than once.
-waxes and steroids

Accepted Answer

A) carbohydrates 
B) proteins 
C) lipids 
D) ​nucleic acids 
A) carbohydrates 
B) proteins 
C) lipids 
D) ​nucleic acids

Question 8

Which type of bond links two amino acids in a protein?

Accepted Answer

A) peptide 
B) ionic 
C) hydrogen 
D) amino 
E) sulfhydryl 
A) peptide 
B) ionic 
C) hydrogen 
D) amino 
E) sulfhydryl

Question 9

Match each biological molecule with the correct description. Some choices may be used more than once.
-enzymes

Accepted Answer

A) carbohydrates 
B) proteins 
C) lipids 
D) ​nucleic acids 
A) carbohydrates 
B) proteins 
C) lipids 
D) ​nucleic acids

Question 10

Nucleotides contain ____ sugars.

Accepted Answer

A) three−carbon 
B) four−carbon 
C) five−carbon 
D) six−carbon 
E) seven−carbon 
A) three−carbon 
B) four−carbon 
C) five−carbon 
D) six−carbon 
E) seven−carbon

Question 11

To prepare a gelatin dessert, heat is used to disrupt hydrogen bonds holding the proteins together, thereby affecting their water solubility and causing them to interact with other proteins to form large, lattice-work structures. This is an example of ____, which is a(n) ____ process.

Accepted Answer

A) misfolding; reversible 
B) metabolism; enzymatic 
C) protein denaturation; irreversible 
D) condensation; reversible 
E) metabolism; irreversible 
A) misfolding; reversible 
B) metabolism; enzymatic 
C) protein denaturation; irreversible 
D) condensation; reversible 
E) metabolism; irreversible

Question 12

What is the main structural component of plants?

Accepted Answer

A) glucose 
B) glycogen 
C) chitin 
D) cellulose 
E) starch 
A) glucose 
B) glycogen 
C) chitin 
D) cellulose 
E) starch

Question 13

An organic molecule is primarily composed of ____.

Accepted Answer

A) water 
B) oxygen 
C) hydrogen only 
D) carbon only 
E) hydrogen and carbon 
A) water 
B) oxygen 
C) hydrogen only 
D) carbon only 
E) hydrogen and carbon

Question 14

Match the chemical reaction with the correct description. Choices may be used more than once.
-chemical reaction produces monomers from polymers

Accepted Answer

A) hydrolysis 
B) condensation 
A) hydrolysis 
B) condensation

Question 15

Match each biological molecule with the correct description. Some choices may be used more than once.
-hydrophobic

Accepted Answer

A) carbohydrates 
B) proteins 
C) lipids 
D) ​nucleic acids 
A) carbohydrates 
B) proteins 
C) lipids 
D) ​nucleic acids

Question 16

The association of four subunit peptides in a fully functional molecule of hemoglobin is an example of ____ protein structure.

Accepted Answer

A) primary 
B) secondary 
C) tertiary 
D) quaternary 
E) aggregate 
A) primary 
B) secondary 
C) tertiary 
D) quaternary 
E) aggregate

Question 17

Organic molecules that increase the rate of chemical reactions, such as condensation and hydrolysis, without being changed in the process are known as ____.

Accepted Answer

A) enzymes 
B) metabolites 
C) denaturating agents 
D) hydrocarbons 
E) prions 
A) enzymes 
B) metabolites 
C) denaturating agents 
D) hydrocarbons 
E) prions

Question 18

The breakdown of large molecules by the enzymatic addition of water occurs during a(n) ____ reaction.

Accepted Answer

A) oxidation 
B) reduction 
C) condensation 
D) hydrolysis 
E) decarboxylation 
A) oxidation 
B) reduction 
C) condensation 
D) hydrolysis 
E) decarboxylation

Question 19

Match each item with the correct statement.
-two bonded monosaccharides

Accepted Answer

A) disaccharide 
B) oligosaccharide 
C) polysaccharide 
D) glucose 
A) disaccharide 
B) oligosaccharide 
C) polysaccharide 
D) glucose

Question 20

The hemoglobin protein, responsible for carrying oxygen in red blood cells, is composed of four polypeptide chains: two alpha-globin and two beta-globin. Sickle cell anemia is characterized by a mutation that causes a change in one amino acid in the beta-chain. This change substitutes a hydrophobic amino acid side chain for the normal polar side chain; therefore, these mutant chains stick to other hemoglobin molecules instead of being attracted to water molecules in the cellular environment. As a result, many hemoglobin molecules clump together, forming large fibers and sickle-shaped red blood cells that are unable to deliver needed oxygen to the body's tissues. The sickle cell mutation affects which level(s) of hemoglobin structure?

Accepted Answer

A) tertiary and quaternary only 
B) primary and secondary only 
C) primary plus abnormal protein aggregation 
D) secondary plus abnormal protein aggregation 
E) tertiary only 
A) tertiary and quaternary only 
B) primary and secondary only 
C) primary plus abnormal protein aggregation 
D) secondary plus abnormal protein aggregation 
E) tertiary only

Exam 3: Molecules of Life

Which type of bond contributes to a protein's secondary structure?

A carbon atom has how many electron vacancies?

​Which molecule(s), derived from cholesterol, plays an important role in the digestion of fats?

Sucrose is composed of ____.

Match each biological molecule with the correct description. Some choices may be used more than once. -structural material for plant and fungi cell walls

​What is the role of DNA?

Match each biological molecule with the correct description. Some choices may be used more than once. -waxes and steroids

Which type of bond links two amino acids in a protein?

Match each biological molecule with the correct description. Some choices may be used more than once. -enzymes

Nucleotides contain ____ sugars.

To prepare a gelatin dessert, heat is used to disrupt hydrogen bonds holding the proteins together, thereby affecting their water solubility and causing them to interact with other proteins to form large, lattice-work structures. This is an example of ____, which is a(n) ____ process.

What is the main structural component of plants?

An organic molecule is primarily composed of ____.

Match the chemical reaction with the correct description. Choices may be used more than once. -chemical reaction produces monomers from polymers

Match each biological molecule with the correct description. Some choices may be used more than once. -hydrophobic

The association of four subunit peptides in a fully functional molecule of hemoglobin is an example of ____ protein structure.

Organic molecules that increase the rate of chemical reactions, such as condensation and hydrolysis, without being changed in the process are known as ____.

The breakdown of large molecules by the enzymatic addition of water occurs during a(n) ____ reaction.

Match each item with the correct statement. -two bonded monosaccharides

The Science of Biology

Lifes Chemical Basis

Cell Structure

Ground Rules of Metabolism

Where It Starts-Photosynthesis

Releasing Chemical Energy

DNA Structure and Function

From DNA to Protein

Control of Gene Expression

How Cells Reproduce

Meiosis and Sexual Reproduction

Patterns in Inherited Traits

Human Inheritance

Biotechnology

Evidence of Evolution

Processes of Evolution

Lifes Origin and Early Evolution

Viruses, Bacteria, and Archaea

The Protists

Plant Evolution

Fungi

Animals I: Major Invertebrate Groups

Animals Ii: the Chordates

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Structural Support and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Reproduction and Development

Animal Behavior

Population Ecology

Community Ecology

Ecosystems

The Biosphere

Human Effects on the Biosphere

Filters

Which molecule(s), derived from cholesterol, plays an important role in the digestion of fats?

What is the role of DNA?

To prepare a gelatin dessert, heat is used to disrupt hydrogen bonds holding the proteins together, thereby affecting their water solubility and causing them to interact with other proteins to form large, lattice-work structures. This is an example of , which is a(n) process.