Question 1

Which includes the other four?

Accepted Answer

A) atoms 
B) molecules 
C) electrons 
D) elements 
E) protons 
A) atoms 
B) molecules 
C) electrons 
D) elements 
E) protons

Question 2

Nitrogen has an atomic number of 7.How many hydrogen atoms are necessary to join with the nitrogen to form a stable compound?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 3

Which of the following historical figures came up with the idea of the periodic table?

Accepted Answer

A) Demitri Medeleev 
B) Niels Bohr 
C) Louis Pateur 
D) Robert Koch 
E) None of these 
A) Demitri Medeleev 
B) Niels Bohr 
C) Louis Pateur 
D) Robert Koch 
E) None of these

Question 4

The atom found in the greatest amount in the human body is

Accepted Answer

A) hydrogen. 
B) carbon. 
C) nitrogen. 
D) oxygen. 
E) phosphorus. 
A) hydrogen. 
B) carbon. 
C) nitrogen. 
D) oxygen. 
E) phosphorus.

Question 5

Which statement is false?

Accepted Answer

A) A molecule is made of at least two atoms. 
B) Compounds are made of elements. 
C) Two atoms of oxygen make a molecule of oxygen. 
D) Proportions of elements in compounds vary according to their source in nature. 
E) Elements are found in compounds and molecules. 
A) A molecule is made of at least two atoms. 
B) Compounds are made of elements. 
C) Two atoms of oxygen make a molecule of oxygen. 
D) Proportions of elements in compounds vary according to their source in nature. 
E) Elements are found in compounds and molecules.

Question 6

An atom that gains or loses electrons becomes

Accepted Answer

A) more stable. 
B) an ion. 
C) a molecule. 
D) unable to form bonds. 
E) radioactive. 
A) more stable. 
B) an ion. 
C) a molecule. 
D) unable to form bonds. 
E) radioactive.

Question 7

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

Accepted Answer

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

Question 8

The radioactive decay of 14C produces

Accepted Answer

A) carbon 12. 
B) carbon 13. 
C) more carbon 14. 
D) nitrogen 14. 
E) oxygen 14. 
A) carbon 12. 
B) carbon 13. 
C) more carbon 14. 
D) nitrogen 14. 
E) oxygen 14.

Question 9

Which of the following is NOT accurate concerning ionization?

Accepted Answer

A) When one atom loses electrons, another must gain electrons. 
B) When an atom loses an electron, it becomes negatively charged. 
C) Ionic bonds form between ionized atoms. 
D) In the compound NaCl, Na loses an electron to become positive. 
E) In an ion, the number of protons and electrons is unequal. 
A) When one atom loses electrons, another must gain electrons. 
B) When an atom loses an electron, it becomes negatively charged. 
C) Ionic bonds form between ionized atoms. 
D) In the compound NaCl, Na loses an electron to become positive. 
E) In an ion, the number of protons and electrons is unequal.

Question 10

Which statement is NOT true?

Accepted Answer

A) Electrons closest to the nucleus are at the lowest energy level. 
B) No more than two electrons can occupy a single orbital. 
C) Electrons are unable to move out of the assigned orbital space. 
D) The innermost orbital holds two electrons. 
E) At the second energy level there are four possible orbitals with a total of eight electrons. 
A) Electrons closest to the nucleus are at the lowest energy level. 
B) No more than two electrons can occupy a single orbital. 
C) Electrons are unable to move out of the assigned orbital space. 
D) The innermost orbital holds two electrons. 
E) At the second energy level there are four possible orbitals with a total of eight electrons.

Question 11

__________ molecule(s) can be detected as it (they) pass(es) through the human body and is (are) used for diagnosis.

Accepted Answer

A) A decay 
B) A tracer 
C) An electron 
D) An atomic 
E) Both the proton and electron 
A) A decay 
B) A tracer 
C) An electron 
D) An atomic 
E) Both the proton and electron

Question 12

A molecule is

Accepted Answer

A) a combination of two or more atoms. 
B) a mixture of atoms. 
C) electrically charged. 
D) a carrier of one or more extra neutrons. 
E) none of these. 
A) a combination of two or more atoms. 
B) a mixture of atoms. 
C) electrically charged. 
D) a carrier of one or more extra neutrons. 
E) none of these.

Question 13

Water is important to the interactions of biological molecules because it

Accepted Answer

A) promotes hydrophobic and hydrophilic interactions. 
B) stabilizes temperature. 
C) is an excellent solvent for polar and ionic substances. 
D) has strong cohesive properties. 
E) is all of the above. 
A) promotes hydrophobic and hydrophilic interactions. 
B) stabilizes temperature. 
C) is an excellent solvent for polar and ionic substances. 
D) has strong cohesive properties. 
E) is all of the above.

Question 14

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

Question 15

The periodic table of the elements was devised by

Accepted Answer

A) Henri Becquerel. 
B) Demitri Mendeleev. 
C) Melvin Calvin. 
D) Marie Curie. 
E) Becquerel and Mendeleev. 
A) Henri Becquerel. 
B) Demitri Mendeleev. 
C) Melvin Calvin. 
D) Marie Curie. 
E) Becquerel and Mendeleev.

Question 16

The nucleus of an atom contains

Accepted Answer

A) neutrons and protons.   
B) neutrons and electrons. 
C) protons and electrons. 
D) protons only. 
E) neutrons only. 
A) neutrons and protons.   
B) neutrons and electrons. 
C) protons and electrons. 
D) protons only. 
E) neutrons only.

Question 17

The atomic number refers to the

Accepted Answer

A) mass of an atom. 
B) number of protons in an atom. 
C) number of both protons and neutrons in an atom. 
D) number of neutrons in an atom. 
E) number of electrons in an atom. 
A) mass of an atom. 
B) number of protons in an atom. 
C) number of both protons and neutrons in an atom. 
D) number of neutrons in an atom. 
E) number of electrons in an atom.

Question 18

Which is NOT a compound?

Accepted Answer

A) salt (NaCl) 
B) a carbohydrate (contains C, H and O) 
C) carbon (
C)  
D) a nucleotide (contains P, C, H, and O) 
E) methane (CH4) 
A) salt (NaCl) 
B) a carbohydrate (contains C, H and O) 
C) carbon (
C)  
D) a nucleotide (contains P, C, H, and O) 
E) methane (CH4)

Question 19

Atoms of isotopes

Accepted Answer

A) are electrically unbalanced. 
B) behave the same chemically and physically but differ biologically from other isotopes. 
C) are the same physically and biologically but differ from other isotopes chemically. 
D) have the same number of protons but a different number of neutrons. 
E) are produced when atoms lose electrons. 
A) are electrically unbalanced. 
B) behave the same chemically and physically but differ biologically from other isotopes. 
C) are the same physically and biologically but differ from other isotopes chemically. 
D) have the same number of protons but a different number of neutrons. 
E) are produced when atoms lose electrons.

Question 20

Magnesium has 12 protons.How many electrons are in its first energy level?

Accepted Answer

A) 2 
B) 4 
C) 6 
D) 8 
E) 10 
A) 2 
B) 4 
C) 6 
D) 8 
E) 10

Exam 2: Lifes Chemical Basis

Which includes the other four?

Nitrogen has an atomic number of 7.How many hydrogen atoms are necessary to join with the nitrogen to form a stable compound?

Which of the following historical figures came up with the idea of the periodic table?

The atom found in the greatest amount in the human body is

Which statement is false?

An atom that gains or loses electrons becomes

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

The radioactive decay of 14C produces

Which of the following is NOT accurate concerning ionization?

Which statement is NOT true?

__________ molecule(s) can be detected as it (they) pass(es) through the human body and is (are) used for diagnosis.

A molecule is

Water is important to the interactions of biological molecules because it

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

The periodic table of the elements was devised by

The nucleus of an atom contains

The atomic number refers to the

Which is NOT a compound?

Atoms of isotopes

Magnesium has 12 protons.How many electrons are in its first energy level?

Invitation to Biology

Molecules of Life

Cell Structure and Function

A Closer Look at Cell Membranes

Ground Rules of Metabolism

Where It Startsphotosynthesis

Energy-Releasing Pathways

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Dna Structure and Function

From Dna to Protein

Controls Over Genes

Recombinant Dna and Genetic Engineering

The Macroevolutionary Puzzle

Emergence of Evolutionary Thought

Organizing Information About Species

The Origin and Evolution of Life

Viruses and Prokaryotes

Protists the Simplest Eukaryotes

Plants

Fungi

Animals: the Invertebrates

Animal Evolution the Chordates

Human Evolution: a Case Study

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction

Plant Growth and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Protection, Support, and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Population Ecology

Community Structure and Biodiversity

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters

The radioactive decay of ¹⁴C produces