Question 1

What is the ratio of fatty acids to glycerol in triglycerides (neutral fats) ?

Accepted Answer

A)   2:1
B)   4:1
C)   3:1
D)   1:1

Question 2

Mrs. Mulligan goes to her dentist and, after having a couple of cavities filled, her dentist strongly suggests that she reduce her intake of sodas and increase her intake of calcium phosphates in the foods she eats. Why?

Accepted Answer

Sodas are strong acids that ca...

Question 3

The pH of body fluids must remain fairly constant for the body to maintain homeostasis.

Accepted Answer

A) True 
 B)False

Question 4

Carbohydrates and proteins are built up from their basic building blocks by the _________.

Accepted Answer

A)   removal of a carbon atom between each two units
B)   removal of a water molecule between each two units
C)   addition of a water molecule between each two units
D)   addition of a carbon atom between each two units

Question 5

The sharing of electrons in covalent bonds makes them stronger than ionic and hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 6

About 60% to 80% of the volume of most living cells consists of organic compounds.

Accepted Answer

A) True 
 B)False

Question 7

Protons and electrons exist in every atom nucleus except hydrogen. Is this statement true or false and why?

Accepted Answer

A) True 
 B)False

Question 8

The basic structural material of the body consists of__________ .

Accepted Answer

A)   nucleic acids
B)   lipids
C)   carbohydrates
D)   proteins

Question 9

Phospholipids make up most of the lipid part of the cell membrane. Since water exists on both the outside and inside of a cell, which of the following phospholipid arrangements makes the most sense?

Accepted Answer

A)   two back-to-back phospholipid layers with the polar heads facing out on both sides
B)   a single layer of phospholipids with the polar heads facing outside the cell
C)   a single layer of phospholipids with the polar heads facing inside the cell
D)   two back-to-back phospholipid layers with the non-polar tails facing out on both sides

Question 10

The fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds.

Accepted Answer

A) True 
 B)False

Question 11

Describe the factors that affect chemical reaction rates.

Accepted Answer

Temperature increases kinetic energy and...

Question 12

What is a cation?

Accepted Answer

A)   an atom that loses one or more electrons and acquires a net positive charge
B)   an atom that shares its valence electrons
C)   a molecule that has both positive and negative charges
D)   an atom that gains one or more electrons and acquires a net negative charge

Question 13

Omega-3 fatty acids appear to decrease the risk of heart disease.

Accepted Answer

A) True 
 B)False

Question 14

The acidity of a solution reflects the concentration of free hydrogen ions in the solution.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following statements is FALSE?

Accepted Answer

A)   Chemical reactions progress at a faster rate when the reacting particles are present in higher numbers.
B)   Catalysts increase the rate of chemical reactions, sometimes while undergoing reversible changes in shape.
C)   Larger particles move faster than smaller ones and thus collide more frequently and more forcefully.
D)   Chemical reactions proceed more quickly at higher temperatures.

Question 16

Which of the following does NOT describe uses for the ATP molecule?

Accepted Answer

A)   mechanical work
B)   chemical work
C)   transport down their concentration gradient
D)   pigment structure

Question 17

Atom X has 17 protons. How many electrons are in its valence shell (outermost energy level) ?

Accepted Answer

A)   7
B)   3
C)   5
D)   10

Question 18

Tendons are strong, rope-like structures that connect skeletal muscle to bone. Which of the following proteins would provide strength to a tendon?

Accepted Answer

A)   albumin
B)   molecular chaperone
C)   collagen
D)   actin

Question 19

Which of the following is chemically inert (unreactive) ?

Accepted Answer

A)   sodium (atomic number 11) 
B)   carbon (atomic number 6) 
C)   oxygen (atomic number 8) 
D)   neon (atomic number 10)

Question 20

When DNA is replicated, it is necessary for the two strands to "unzip" temporarily. Choose which bonding type is most appropriate for holding the strands together in this way.

Accepted Answer

A)   hydrogen bonding
B)   non-polar covalent bonding
C)   ionic bonding
D)   polar covalent bonding

Exam 2: Chemistry Comes Alive

Phospholipids make up most of the lipid part of the cell membrane. Since water exists on both the outside and inside of a cell, which of the following phospholipid arrangements makes the most sense?

Correct AnswerverifiedShow Answer

What is a cation?

Correct AnswerverifiedShow Answer

Which of the following is chemically inert (unreactive) ?

Correct AnswerverifiedShow Answer

Mrs. Mulligan goes to her dentist and, after having a couple of cavities filled, her dentist strongly suggests that she reduce her intake of sodas and increase her intake of calcium phosphates in the foods she eats. Why?

Correct AnswerverifiedSodas are strong acids that ca...View AnswerShow Answer

The pH of body fluids must remain fairly constant for the body to maintain homeostasis.

Correct AnswerverifiedShow Answer

Carbohydrates and proteins are built up from their basic building blocks by the _________.

Correct AnswerverifiedShow Answer

Protons and electrons exist in every atom nucleus except hydrogen. Is this statement true or false and why?

Correct AnswerverifiedShow Answer

What is the ratio of fatty acids to glycerol in triglycerides (neutral fats) ?

Correct AnswerverifiedShow Answer

The basic structural material of the body consists of__________ .

Correct AnswerverifiedShow Answer

The fact that no chemical bonding occurs between the components of a mixture is the chief difference between mixtures and compounds.

Correct AnswerverifiedShow Answer

Describe the factors that affect chemical reaction rates.

Correct AnswerverifiedTemperature increases kinetic energy and...View AnswerShow Answer

Omega-3 fatty acids appear to decrease the risk of heart disease.

Correct AnswerverifiedShow Answer

Tendons are strong, rope-like structures that connect skeletal muscle to bone. Which of the following proteins would provide strength to a tendon?

Correct AnswerverifiedShow Answer

Which of the following does NOT describe uses for the ATP molecule?

Correct AnswerverifiedShow Answer

The sharing of electrons in covalent bonds makes them stronger than ionic and hydrogen bonds.

Correct AnswerverifiedShow Answer

Atom X has 17 protons. How many electrons are in its valence shell (outermost energy level) ?

Correct AnswerverifiedShow Answer

Which of the following statements is FALSE?

Correct AnswerverifiedShow Answer

When DNA is replicated, it is necessary for the two strands to "unzip" temporarily. Choose which bonding type is most appropriate for holding the strands together in this way.

Correct AnswerverifiedShow Answer

The acidity of a solution reflects the concentration of free hydrogen ions in the solution.

Correct AnswerverifiedShow Answer

About 60% to 80% of the volume of most living cells consists of organic compounds.

Correct AnswerverifiedShow Answer

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Sodas are strong acids that ca...
View Answer

Correct Answer
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Temperature increases kinetic energy and...
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Correct Answer
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