Question 1

A base is an electrolyte that releases ions that combine with hydrogen ions.

Accepted Answer

A) True 
 B)False

Question 2

Isotopes of an element have

Accepted Answer

A)  the same atomic number and same atomic weight.
B)  the same atomic number but different atomic weights.
C)  different atomic numbers but the same atomic weight.
D)  different atomic numbers and different atomic weights.E) A) and B)
F) A) and C)

Question 3

When forming a bond,an atom that has 3 electrons in its second shell and a filled first shell will

Accepted Answer

A)  lose 3 electrons from its second shell.
B)  lose all of the electrons from its first shell.
C)  lose all of the electrons from both its first and second shells.
D)  gain 5 electrons in its second shell.E) None of the above
F) C) and D)

Question 4

The informational content of DNA and RNA is in the nitrogenous bases because

Accepted Answer

A)  the bases are of several types and therefore can form a code sequence.
B)  they all contain nitrogen.
C)  the sugars and phosphates vary.
D)  the bases are also parts of amino acids.E) B) and C)
F) A) and D)

Question 5

The difference in hydrogen ion concentration between solutions with pH 4 and pH 5 is

Accepted Answer

A)  twofold.
B)  fivefold.
C)  tenfold.
D)  twentyfolD.E) A) and B)
F) C) and D)

Question 6

Which of the following is(are) ionizing radiation?

Accepted Answer

A)  Cosmic radiation only
B)  Gamma radiation only
C)  Both cosmic radiation and gamma radiation
D)  Neither cosmic nor gamma radiationE) C) and D)
F) None of the above

Question 7

Which of the following groups of compounds is hydrophobic?

Accepted Answer

A)  Carbohydrates
B)  Lipids
C)  Proteins
D)  Nucleic AcidsE) A) and C)
F) C) and D)

Question 8

Two or more atoms bonding form a ________.

Accepted Answer

The answer of Two or more atoms bonding form a...

Question 9

Chemically inert atoms always have their outermost electron shell full.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following substances is an element?

Accepted Answer

A)  Iron
B)  Water
C)  Sodium chloride
D)  GlucoseE) All of the above
F) A) and D)

Question 11

Consider the following list of commonly found items and their pH values: 
Which of the choices includes all acids?

Accepted Answer

A)  Egg whites,baking soda,milk of magnesia,and bleach
B)  Tomatoes,egg whites,and baking soda
C)  Vinegar,grapes,tomatoes,and coffee
D)  Beer,butter,and baking sodaE) A) and D)
F) A) and C)

Question 12

A chemical reaction in which parts of different molecules trade positions is a(n)

Accepted Answer

A)  decomposition reaction.
B)  exchange reaction.
C)  reversible reaction.
D)  synthesis reaction.E) A) and B)
F) None of the above

Question 13

The number of protons in an atom of an element always equals its atomic weight.

Accepted Answer

A) True 
 B)False

Question 14

The type of organic molecule that can replicate is a

Accepted Answer

A)  protein.
B)  lipid.
C)  carbohydrate.
D)  nucleic aciD.E) A) and B)
F) None of the above

Question 15

At atom that has gained or lost electrons is called an ion.

Accepted Answer

A) True 
 B)False

Question 16

When atoms form chemical bonds,the subatomic particles that directly interact are the ________.

Accepted Answer

The answer of When atoms form chemical bonds,the subatomic particles...

Question 17

The amino acid sequence of a protein is its __________ structure.

Accepted Answer

The answer of The amino acid sequence of a protein...

Question 18

Nucleic acids are composed of building blocks called amino acids.

Accepted Answer

A) True 
 B)False

Question 19

The atomic number of an atom equals the number of ______ and the atomic weight equals the ____.

Accepted Answer

A)  neutrons;number of protons
B)  protons;weight of all the electrons
C)  neutrons;number of protons plus electrons
D)  protons;number of protons plus neutronsE) A) and D)
F) B) and C)

Question 20

A person has alkalosis if the blood pH

Accepted Answer

A)  is above 7.0.
B)  is below 7.0.
C)  rises above 7.5.
D)  drops below 7.3.E) B) and D)
F) C) and D)

Exam 2: Chemical Basis of Life

A person has alkalosis if the blood pH

Correct AnswerverifiedShow Answer

Chemically inert atoms always have their outermost electron shell full.

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Consider the following list of commonly found items and their pH values: Which of the choices includes all acids?

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Isotopes of an element have

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A chemical reaction in which parts of different molecules trade positions is a(n)

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The type of organic molecule that can replicate is a

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A base is an electrolyte that releases ions that combine with hydrogen ions.

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When forming a bond,an atom that has 3 electrons in its second shell and a filled first shell will

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Which of the following is(are) ionizing radiation?

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Which of the following substances is an element?

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Which of the following groups of compounds is hydrophobic?

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The number of protons in an atom of an element always equals its atomic weight.

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When atoms form chemical bonds,the subatomic particles that directly interact are the ________.

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Nucleic acids are composed of building blocks called amino acids.

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The atomic number of an atom equals the number of ______ and the atomic weight equals the ____.

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Two or more atoms bonding form a ________.

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The difference in hydrogen ion concentration between solutions with pH 4 and pH 5 is

Correct AnswerverifiedShow Answer

The informational content of DNA and RNA is in the nitrogenous bases because

Correct AnswerverifiedShow Answer

At atom that has gained or lost electrons is called an ion.

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The amino acid sequence of a protein is its __________ structure.

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The atomic number of an atom equals the number of __ and the atomic weight equals the .

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