Question 1

Tracers are elements that ____.

Accepted Answer

A)  ​are used in minute amounts in plants 
B)  ​can be monitored through biochemical reactions 
C)  ​must be inert 
D)  ​have an unbalanced electrical charge 
E)  ​must have a stable nucleus 
A)  ​are used in minute amounts in plants 
B)  ​can be monitored through biochemical reactions 
C)  ​must be inert 
D)  ​have an unbalanced electrical charge 
E)  ​must have a stable nucleus

Question 2

The radioisotope 14C can be used as a research tracer because it ____.

Accepted Answer

A)  ​decays to 12C 
B)  ​has a different number of protons than 12C 
C)  ​has fewer neutrons than 12C 
D)  ​behaves the same chemically as 12C 
E)  ​has six carbons and six neutrons 
A)  ​decays to 12C 
B)  ​has a different number of protons than 12C 
C)  ​has fewer neutrons than 12C 
D)  ​behaves the same chemically as 12C 
E)  ​has six carbons and six neutrons

Question 3

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​
-A substance that dissolves in water

Accepted Answer

A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent 
A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent

Question 4

The most likely reason that glucose dissolves in water is that it is ____.

Accepted Answer

A)  ​an ionic compound 
B)  ​a polysaccharide 
C)  ​polar and forms many hydrogen bonds with the water molecules 
D)  ​an extremely unstable molecule 
E)  ​highly nonpolar 
A)  ​an ionic compound 
B)  ​a polysaccharide 
C)  ​polar and forms many hydrogen bonds with the water molecules 
D)  ​an extremely unstable molecule 
E)  ​highly nonpolar

Question 5

A molecule consists of ____.

Accepted Answer

A)  ​radioactive compounds 
B)  ​two or more atoms of the same element 
C)  ​electrically charged elements 
D)  ​elements with one or more extra neutrons 
E)  ​atoms held together by chemical bonds 
A)  ​radioactive compounds 
B)  ​two or more atoms of the same element 
C)  ​electrically charged elements 
D)  ​elements with one or more extra neutrons 
E)  ​atoms held together by chemical bonds

Question 6

In the chemical shorthand, 14C, the 14 represents the number of ____.

Accepted Answer

A)  ​excess neutrons 
B)  ​protons plus neutrons 
C)  ​electrons 
D)  ​protons plus electrons 
E)  ​radioactive particles 
A)  ​excess neutrons 
B)  ​protons plus neutrons 
C)  ​electrons 
D)  ​protons plus electrons 
E)  ​radioactive particles

Question 7

The ____ of an atom have no charge.

Accepted Answer

A)  ​electrons 
B)  ​protons 
C)  ​neutrons 
D)  ​ions 
E)  ​nuclei 
A)  ​electrons 
B)  ​protons 
C)  ​neutrons 
D)  ​ions 
E)  ​nuclei

Question 8

Which substance is not an element?​

Accepted Answer

A)  ​chlorine 
B)  ​oxygen 
C)  ​carbon 
D)  ​water 
E)  ​hydrogen 
A)  ​chlorine 
B)  ​oxygen 
C)  ​carbon 
D)  ​water 
E)  ​hydrogen

Question 9

A salt will dissolve in water to form ____.

Accepted Answer

A)  ​acids 
B)  ​only hydrogen and oxygen bonds 
C)  ​ions other than H+ and OH- 
D)  ​bases 
E)  ​buffers 
A)  ​acids 
B)  ​only hydrogen and oxygen bonds 
C)  ​ions other than H+ and OH- 
D)  ​bases 
E)  ​buffers

Question 10

Which statement is false?

Accepted Answer

A)  ​A molecule must be made of at least two atoms. 
B)  ​Compounds are made of elements. 
C)  ​Two atoms of oxygen make a molecule of oxygen. 
D)  ​Chemical bonds form between molecules of solute and solvent. 
E)  ​Elements are found in compounds and molecules. 
A)  ​A molecule must be made of at least two atoms. 
B)  ​Compounds are made of elements. 
C)  ​Two atoms of oxygen make a molecule of oxygen. 
D)  ​Chemical bonds form between molecules of solute and solvent. 
E)  ​Elements are found in compounds and molecules.

Question 11

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​
-A liquid that dissolves other substances

Accepted Answer

A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent 
A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent

Question 12

The atomic number of an atom refers to its ____.

Accepted Answer

A)  ​mass or weight 
B)  ​number of protons 
C)  number of protons and neutrons​ 
D)  ​number of neutrons 
E)  ​number of electrons 
A)  ​mass or weight 
B)  ​number of protons 
C)  number of protons and neutrons​ 
D)  ​number of neutrons 
E)  ​number of electrons

Question 13

The sharing of two pairs of electrons between two atoms is called a(n) ____________________.

Accepted Answer

The answer of The sharing of two pairs of electrons...

Question 14

14Cis a radioactive isotope, and it turns into ____________________ when it decays.

Accepted Answer

The answer of 14Cis a radioactive isotope, and it turns...

Question 15

The predictable rate of ____________________ allows tracers to be used in research studies.

Accepted Answer

decay​
rad

Question 16

The following are important terms relating to acids and bases. Answer the question below by matching the description with the most appropriate word.​
-Substance that accepts, but does not release, H+

Accepted Answer

A) ​pH 
B) ​acid 
C) ​base 
D) ​buffer 
A) ​pH 
B) ​acid 
C) ​base 
D) ​buffer

Question 17

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​
-A substance that does not dissolve in water

Accepted Answer

A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent 
A) ​hydrophobic 
B) ​hydrophilic 
C) ​​salt 
D) ​​solute 
E) ​​solvent

Question 18

What is the smallest unit of an element that retains the properties of that element?

Accepted Answer

A)  ​atom 
B)  ​compound 
C)  ​ion 
D)  ​molecule 
E)  ​mixture 
A)  ​atom 
B)  ​compound 
C)  ​ion 
D)  ​molecule 
E)  ​mixture

Question 19

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type
-A bond in which connected atoms share electrons​

Accepted Answer

A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond 
A) ​hydrogen 
B) ​ionic 
C) ​covalent 
D) ​polar covalent 
E) ​double bond

Question 20

How much mercury can the average human safely consume per day?

Accepted Answer

A)  ​2 micrograms 
B)  7 micrograms​ 
C)  ​12 micrograms 
D)  55 micrograms​ 
E)  90 micrograms​ 
A)  ​2 micrograms 
B)  7 micrograms​ 
C)  ​12 micrograms 
D)  55 micrograms​ 
E)  90 micrograms​

Exam 2: Lifes Chemical Basis

Tracers are elements that ____.

The radioisotope 14C can be used as a research tracer because it ____.

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​ -A substance that dissolves in water

The most likely reason that glucose dissolves in water is that it is ____.

A molecule consists of ____.

In the chemical shorthand, 14C, the 14 represents the number of ____.

The ____ of an atom have no charge.

Which substance is not an element?​

A salt will dissolve in water to form ____.

Which statement is false?

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​ -A liquid that dissolves other substances

The atomic number of an atom refers to its ____.

The sharing of two pairs of electrons between two atoms is called a(n) ____________________.

14Cis a radioactive isotope, and it turns into ____________________ when it decays.

The predictable rate of ____________________ allows tracers to be used in research studies.

The following are important terms relating to acids and bases. Answer the question below by matching the description with the most appropriate word.​ -Substance that accepts, but does not release, H+

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word.​ -A substance that does not dissolve in water

What is the smallest unit of an element that retains the properties of that element?

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type -A bond in which connected atoms share electrons​

How much mercury can the average human safely consume per day?

Invitation to Biology

Molecules of Life

Cell Structure and Function

Ground Rules of Metabolism

Where It Starts - Photosynthesis

How Cells Release Chemical Energy

Dna Structure and Function

From Dna to Protein

Gene Control

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Studying and Manipulating Genomes

Evidence of Evolution

Processes of Evolution

Organizating Information About Species

Lifes Origin and Early Evolution

Viruses - Bacteria - and Archaea

Protists - the Simplest Eukaryotes

The Land Plants

Fungi

Animal Evolution - the Invertibrates

Animal Evolution - the Chordates

Human Evolution

Plant Tissues

Plant Nutrition and Transport

Life Cycles of Flowering Plants

Communication Strategies in Plants

Animal Tissues

Neural Control

Sensory Perception

Endocrine Control

Structural Support and Movement

Circulation

Immunity

Respiration

Digestion and Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Filters

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word. -A substance that dissolves in water

Which substance is not an element?

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word. -A liquid that dissolves other substances

The following are important terms relating to acids and bases. Answer the question below by matching the description with the most appropriate word. -Substance that accepts, but does not release, H⁺

The following are important terms relating to water's special properties. Answer the question below by matching the descriptions with the most appropriate word. -A substance that does not dissolve in water

The following are types of chemical bonds. Answer the question below by matching the descriptions with the most appropriate bond type -A bond in which connected atoms share electrons