Question 1

The double helix is a structure associated with:

Accepted Answer

A) disaccharides 
B) a compound with hydrogen bonds 
C) lipids 
D) DNA 
A) disaccharides 
B) a compound with hydrogen bonds 
C) lipids 
D) DNA

Question 2

What is true about oxidation

Accepted Answer

A) The more oxidized a molecule,the less energy it contains. 
B) Oxidation is the removal of oxygen or the addition of hydrogen or electrons to a substance. 
C) Gasoline represents the extreme of energy-rich oxidized compounds. 
D) Oxidation reactions only occur in polar compounds. 
A) The more oxidized a molecule,the less energy it contains. 
B) Oxidation is the removal of oxygen or the addition of hydrogen or electrons to a substance. 
C) Gasoline represents the extreme of energy-rich oxidized compounds. 
D) Oxidation reactions only occur in polar compounds.

Question 3

Which statement is true for radioisotopes

Accepted Answer

A) Radioisotopes have unstable nuclei that emit subatomic particles and radiation. 
B) All radioisotopes have gained electrons. 
C) Radioisotopes are useful to guard against radioactive elements. 
D) Radioisotopes contain particles too large to form true solutions. 
A) Radioisotopes have unstable nuclei that emit subatomic particles and radiation. 
B) All radioisotopes have gained electrons. 
C) Radioisotopes are useful to guard against radioactive elements. 
D) Radioisotopes contain particles too large to form true solutions.

Question 4

Which is a false statement about chemical reactions

Accepted Answer

A) Catabolic reactions are exergonic and release energy. 
B) Polymerization and the building up of large molecules is a catabolic reaction. 
C) Anabolic reactions require energy. 
D) Energy is stored in the form of chemical bonds. 
A) Catabolic reactions are exergonic and release energy. 
B) Polymerization and the building up of large molecules is a catabolic reaction. 
C) Anabolic reactions require energy. 
D) Energy is stored in the form of chemical bonds.

Question 5

The total of protons in an atom is equal to its _____.

Accepted Answer

A) atomic weight 
B) molecular weight 
C) chemical weight 
D) atomic number 
A) atomic weight 
B) molecular weight 
C) chemical weight 
D) atomic number

Question 6

When proteins are made up of several polypeptide chains,the arrangement of these chains is referred to as the:

Accepted Answer

A) primary structure 
B) secondary structure 
C) tertiary structure 
D) quaternary structure 
A) primary structure 
B) secondary structure 
C) tertiary structure 
D) quaternary structure

Question 7

What is true about atomic weight

Accepted Answer

A) It is the sum of the number of electrons and protons in an atom. 
B) The higher the atomic weight the more likely an atom will form a chemical bond. 
C) It is always a whole number. 
D) Atoms of a particular element that have different atomic weights are called isotopes. 
A) It is the sum of the number of electrons and protons in an atom. 
B) The higher the atomic weight the more likely an atom will form a chemical bond. 
C) It is always a whole number. 
D) Atoms of a particular element that have different atomic weights are called isotopes.

Question 8

Which of the following is not a colloid

Accepted Answer

A) salt water 
B) gelatin desserts 
C) agar plates used to grow microorganisms 
D) fluid in cells 
A) salt water 
B) gelatin desserts 
C) agar plates used to grow microorganisms 
D) fluid in cells

Question 9

Organic molecules with the same molecular formula but different structures are:

Accepted Answer

A) elements 
B) isotopes 
C) isomers 
D) anions 
A) elements 
B) isotopes 
C) isomers 
D) anions

Question 10

Which is a false statement about water

Accepted Answer

A) Water molecules are polar. 
B) Water has a high specific heat because of the extensive covalent bonding between molecules. 
C) Hydrogen atoms in water form dipoles with a partial positive charge. 
D) Water's polarity allows for many ionic compounds to be dissolved in it. 
A) Water molecules are polar. 
B) Water has a high specific heat because of the extensive covalent bonding between molecules. 
C) Hydrogen atoms in water form dipoles with a partial positive charge. 
D) Water's polarity allows for many ionic compounds to be dissolved in it.

Question 11

An ion is all of the following except:

Accepted Answer

A) a charged atom 
B) an atom that has lost or gained one or more electrons 
C) either a cation or an anion 
D) an atom with the same number of protons as electrons 
A) a charged atom 
B) an atom that has lost or gained one or more electrons 
C) either a cation or an anion 
D) an atom with the same number of protons as electrons

Question 12

Chemically stable atoms are inert or less likely to form chemical bonds.A chemically stable element:

Accepted Answer

A) has l full outer electron shell 
B) has the same number of protons as electrons 
C) has an atomic number is equal to the atomic mass 
D) forms hydrogen bonds 
A) has l full outer electron shell 
B) has the same number of protons as electrons 
C) has an atomic number is equal to the atomic mass 
D) forms hydrogen bonds

Question 13

Which of the following pH values would indicate the weakest acid

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
A) 2 
B) 3 
C) 4 
D) 5

Question 14

Phospholipids:

Accepted Answer

A) have a charged phosphate group that can mix with water and insoluble fatty acids. 
B) can serve as hormones. 
C) always remain liquid at room temperature. 
D) form straight chains in water. 
A) have a charged phosphate group that can mix with water and insoluble fatty acids. 
B) can serve as hormones. 
C) always remain liquid at room temperature. 
D) form straight chains in water.

Question 15

In salt,a sodium atom loses an electron to a chlorine atom.What is true about the chloride ion found in salt

Accepted Answer

A) It has one less electron than proton. 
B) It is less chemically stable than a chlorine atom. 
C) It is an anion. 
D) It is in a covalent bond. 
A) It has one less electron than proton. 
B) It is less chemically stable than a chlorine atom. 
C) It is an anion. 
D) It is in a covalent bond.

Question 16

The pH scale is used to specify the acidity or alkalinity of a solution.Which of the following statements is true

Accepted Answer

A) Stomach acid has a pH around 10. 
B) Neutral solutions,like water,have a pH of 10. 
C) A solution with a pH of 12 has 10 times less protons. 
D) A strong base will have a pH less than 10. 
A) Stomach acid has a pH around 10. 
B) Neutral solutions,like water,have a pH of 10. 
C) A solution with a pH of 12 has 10 times less protons. 
D) A strong base will have a pH less than 10.

Question 17

Charged atoms with electrostatic attraction are generally held together by _____.

Accepted Answer

A) covalent bonds 
B) ionic bonds 
C) hydrogen bonds 
D) municipal bonds 
A) covalent bonds 
B) ionic bonds 
C) hydrogen bonds 
D) municipal bonds

Question 18

Chemical reactions occur:

Accepted Answer

A) between elements that have magnetic repulsion. 
B) rarely as very few elements have electrons in their outer shell. 
C) during metabolism as they are necessary for making the substance of cells. 
D) only in eukaryotes as they require a nucleus. 
A) between elements that have magnetic repulsion. 
B) rarely as very few elements have electrons in their outer shell. 
C) during metabolism as they are necessary for making the substance of cells. 
D) only in eukaryotes as they require a nucleus.

Question 19

Which of the following statements about solutions is false

Accepted Answer

A) The solute is the substance dissolved in a solvent. 
B) Left alone on a counter,a solution will separate out. 
C) Solutes can consist of atoms,ions or molecules. 
D) In cells,water is typically a solvent. 
A) The solute is the substance dissolved in a solvent. 
B) Left alone on a counter,a solution will separate out. 
C) Solutes can consist of atoms,ions or molecules. 
D) In cells,water is typically a solvent.

Question 20

Water plays an important role in the chemical reactions in cells,including:

Accepted Answer

A) denaturing proteins 
B) stabilizing the primary structure of a protein 
C) forming covalent bonds with proteins 
D) breaking down large proteins into amino acids in hydrolysis reactions 
A) denaturing proteins 
B) stabilizing the primary structure of a protein 
C) forming covalent bonds with proteins 
D) breaking down large proteins into amino acids in hydrolysis reactions

Exam 3: Fundamentals of Chemistry

The double helix is a structure associated with:

What is true about oxidation

Which statement is true for radioisotopes

Which is a false statement about chemical reactions

The total of protons in an atom is equal to its _____.

When proteins are made up of several polypeptide chains,the arrangement of these chains is referred to as the:

What is true about atomic weight

Which of the following is not a colloid

Organic molecules with the same molecular formula but different structures are:

Which is a false statement about water

An ion is all of the following except:

Chemically stable atoms are inert or less likely to form chemical bonds.A chemically stable element:

Which of the following pH values would indicate the weakest acid

Phospholipids:

In salt,a sodium atom loses an electron to a chlorine atom.What is true about the chloride ion found in salt

The pH scale is used to specify the acidity or alkalinity of a solution.Which of the following statements is true

Charged atoms with electrostatic attraction are generally held together by _____.

Chemical reactions occur:

Which of the following statements about solutions is false

Water plays an important role in the chemical reactions in cells,including:

Scope and History of Microbiology

The Microbiome

Microscopy and Staining

Characteristics of Prokaryotic and Eukaryotic Cells

Essential Concepts of Metabolism

Growth and Culturing of Bacteria

Microbial Genetics

Gene Transfer and Genetic Engineering

An Introduction to Taxonomy: The Bacteria

Viruses

Eukaryotic Microorganisms and Parasites

Sterilization and Disinfection

Antimicrobial Therapy

Host-Microbe Relationships and Disease Processes

Epidemiology and Nosocomial Infections

Innate Host Defenses

Basic Principles of Adaptive Immunity and Immunization

Immune Disorders

Diseases of the Skin and Eyes; Wounds and Bites

Urogenital and Sexually Transmitted Diseases

Diseases of the Respiratory System

Oral and Gastrointestinal Diseases

Cardiovascular, Lymphatic, and Systemic Diseases

Diseases of the Nervous System

Environmental Microbiology

Applied Microbiology

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