Question 1

Dissociation of salts is important to:

Accepted Answer

A) free ions to take part in other reactions 
B) produce energy 
C) keep salt molecules stable in water 
D) keep salt molecules stable as solids 
A) free ions to take part in other reactions 
B) produce energy 
C) keep salt molecules stable in water 
D) keep salt molecules stable as solids A

Question 2

Which statement is NOT true of organic molecules?

Accepted Answer

A) RNA is important for protein synthesis. 
B) Cholesterol is part of cell membranes. 
C) Glucose is the most important pentose sugar. 
D) All enzymes are proteins. 
A) RNA is important for protein synthesis. 
B) Cholesterol is part of cell membranes. 
C) Glucose is the most important pentose sugar. 
D) All enzymes are proteins. C

Question 3

Which statement is NOT true of ionic bonds?

Accepted Answer

A) They form salts. 
B) In the solid state they are very strong. 
C) In water,many ionic bonds weaken. 
D) They involve the sharing of electrons. 
A) They form salts. 
B) In the solid state they are very strong. 
C) In water,many ionic bonds weaken. 
D) They involve the sharing of electrons. D

Question 4

A solution that has more hydroxyl ions than hydrogen ions is:

Accepted Answer

A) neutral 
B) a base 
C) an acid 
D) none of these 
A) neutral 
B) a base 
C) an acid 
D) none of these

Question 5

A solution with a pH of 2.5 would be:

Accepted Answer

A) slightly acidic 
B) strongly acidic 
C) slightly alkaline 
D) strongly alkaline 
A) slightly acidic 
B) strongly acidic 
C) slightly alkaline 
D) strongly alkaline

Question 6

The element that is necessary for blood clotting is:

Accepted Answer

A) sulfur 
B) calcium 
C) copper 
D) potassium 
A) sulfur 
B) calcium 
C) copper 
D) potassium

Question 7

A decrease in pH may disrupt the functioning of an enzyme because:

Accepted Answer

A) the enzyme must help out the bicarbonate buffer system 
B) the active site becomes clogged with excess water 
C) the substrate fits into the active site but cannot get out 
D) excess hydrogen ions may block the active site 
A) the enzyme must help out the bicarbonate buffer system 
B) the active site becomes clogged with excess water 
C) the substrate fits into the active site but cannot get out 
D) excess hydrogen ions may block the active site

Question 8

If body fluids are becoming too acidic,this means that there are excess ___ ions in the fluid.

Accepted Answer

A) sodium 
B) potassium 
C) hydroxyl 
D) hydrogen 
A) sodium 
B) potassium 
C) hydroxyl 
D) hydrogen

Question 9

The element that is part of vitamin B12 is:

Accepted Answer

A) sodium 
B) copper 
C) calcium 
D) cobalt 
A) sodium 
B) copper 
C) calcium 
D) cobalt

Question 10

The sense of taste depends upon water as a:

Accepted Answer

A) solvent 
B) lubricant 
C) transporter 
D) heat absorber 
A) solvent 
B) lubricant 
C) transporter 
D) heat absorber

Question 11

A bond in which electrons are shared between atoms is:

Accepted Answer

A) ionic 
B) reciprocal 
C) covalent 
D) di-electron 
A) ionic 
B) reciprocal 
C) covalent 
D) di-electron

Question 12

In cell respiration,the breakdown of glucose to form ATP must take place in the presence of:

Accepted Answer

A) carbon dioxide 
B) water 
C) hydrogen 
D) oxygen 
A) carbon dioxide 
B) water 
C) hydrogen 
D) oxygen

Question 13

An atom of carbon has ___ electrons to share to form ___ bonds.

Accepted Answer

A) 2/ionic 
B) 4/covalent 
C) 2/covalent 
D) 4/ionic 
A) 2/ionic 
B) 4/covalent 
C) 2/covalent 
D) 4/ionic

Question 14

A cation has a:

Accepted Answer

A) positive charge 
B) negative charge 
C) neutral charge 
D) none of these,because the charge may vary 
A) positive charge 
B) negative charge 
C) neutral charge 
D) none of these,because the charge may vary

Question 15

The bonds that help maintain the three-dimensional shape of proteins and nucleic acids are:

Accepted Answer

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

Question 16

Two elements that provide strength in bones and teeth are:

Accepted Answer

A) iron and calcium 
B) calcium and potassium 
C) sodium and phosphorus 
D) calcium and phosphorus 
A) iron and calcium 
B) calcium and potassium 
C) sodium and phosphorus 
D) calcium and phosphorus

Question 17

When the bicarbonate buffer system buffers the strong acid HCl:

Accepted Answer

A) carbonic acid is formed,which only slightly lowers pH 
B) sodium chloride is formed,which raises pH 
C) water is formed,which lowers pH 
D) sodium chloride is formed,which lowers pH 
A) carbonic acid is formed,which only slightly lowers pH 
B) sodium chloride is formed,which raises pH 
C) water is formed,which lowers pH 
D) sodium chloride is formed,which lowers pH

Question 18

Ionization of salts such as sodium chloride takes place:

Accepted Answer

A) when the temperature rises 
B) when the temperature falls 
C) in the solid state 
D) in water 
A) when the temperature rises 
B) when the temperature falls 
C) in the solid state 
D) in water

Question 19

The pentose sugars are part of:

Accepted Answer

A) starches 
B) DNA and RNA 
C) specialized enzymes 
D) cell membranes 
A) starches 
B) DNA and RNA 
C) specialized enzymes 
D) cell membranes

Question 20

The element iodine is an essential part of the hormone:

Accepted Answer

A) insulin 
B) thyroxine 
C) estrogen 
D) growth hormone 
A) insulin 
B) thyroxine 
C) estrogen 
D) growth hormone

Exam 3:Some Basic Chemistry-Part C

Dissociation of salts is important to:

Which statement is NOT true of organic molecules?

Which statement is NOT true of ionic bonds?

A solution that has more hydroxyl ions than hydrogen ions is:

A solution with a pH of 2.5 would be:

The element that is necessary for blood clotting is:

A decrease in pH may disrupt the functioning of an enzyme because:

If body fluids are becoming too acidic,this means that there are excess ___ ions in the fluid.

The element that is part of vitamin B12 is:

The sense of taste depends upon water as a:

A bond in which electrons are shared between atoms is:

In cell respiration,the breakdown of glucose to form ATP must take place in the presence of:

An atom of carbon has ___ electrons to share to form ___ bonds.

A cation has a:

The bonds that help maintain the three-dimensional shape of proteins and nucleic acids are:

Two elements that provide strength in bones and teeth are:

When the bicarbonate buffer system buffers the strong acid HCl:

Ionization of salts such as sodium chloride takes place:

The pentose sugars are part of:

The element iodine is an essential part of the hormone:

Organization and General Plan of the Body-Part A

Organization and General Plan of the Body-Part B

Organization and General Plan of the Body-Part C

Some Basic Chemistry-Part A

Some Basic Chemistry-Part B

Cells-Part A

Cells-Part B

Cells-Part C

Tissues and Membranes-Part A

Tissues and Membranes-Part B

Tissues and Membranes-Part C

The Integumentary System-Part A

The Integumentary System-Part B

The Integumentary System-Part C

The Skeletal System-Part A

The Skeletal System-Part B

The Skeletal System-Part C

The Muscular System-Part A

The Muscular System-Part B

The Muscular System-Part C

The Nervous System-Part A

The Nervous System-Part B

The Nervous System-Part C

The Senses-Part A

The Senses-Part B

The Senses-Part C

The Endocrine System-Part A

The Endocrine System-Part B

The Endocrine System-Part C

Blood-Part A

Blood-Part B

Blood-Part C

The Heart-Part A

The Heart-Part B

The Heart-Part C

The Vascular System-Part A

The Vascular System-Part B

The Vascular System-Part C

The Lymphatic System and Immunity-Part A

The Lymphatic System and Immunity-Part B

The Lymphatic System and Immunity-Part C

The Respiratory System-Part A

The Respiratory System-Part B

The Respiratory System-Part C

The Digestive System-Part A

The Digestive System-Part B

The Digestive System-Part C

Body Temperature and Metabolism-Part A

Body Temperature and Metabolism-Part B

Body Temperature and Metabolism-Part C

The Urinary System-Part A

The Urinary System-Part B

The Urinary System-Part C

Fluid–Electrolyte and Acid–Base Balance-Part A

Fluid–Electrolyte and Acid–Base Balance-Part B

Fluid–Electrolyte and Acid–Base Balance-Part C

The Reproductive Systems-Part A

The Reproductive Systems-Part B

The Reproductive Systems-Part C

The element that is part of vitamin B₁₂ is:

An atom of carbon has _ electrons to share to form _ bonds.