Week 4 Practice Quiz

Question 0

Carbohydrates, lipids, and proteins are classified as
A) organic molecules
B) inorganic molecules
C) acids
D) salts
E) bases

Answer 0

A) organic molecules

Question 1

The four elements making up about 96% of the body's mass are represented by the symbols:
A) O, Ca, H, Na
B) O, C, H, N
C) O, C, He, Na
D) O, H, K, N
E) O, Ca, H, Ni

Answer 1

B) O, C, H, N

Question 2

An example of an inorganic substance is
A) fructose
B) water
C) lipid
D) glycogen
E) cholesterol

Answer 2

B) water

Question 3

Carbohydrate molecules
A) are integral molecules of the cell membrane
B) form the regulatory molecules known as enzymes
C) are the body’s most readily available source of energy
D) are composed of C, H, O, and N atoms
E) contain the genetic information found in cells

Answer 3

C) are the body’s most readily available source of energy

Question 4

The most important metabolic fuel molecule in the body is
A) sucrose
B) starch
C) protein
D) vitamins
E) glucose

Answer 4

E) glucose

Question 5

A polysaccharide that is formed in liver and muscle cells to store glucose is
A) starch
B) cellulose
C) glycogen
D) sucrose
E) fructose

Answer 5

C) glycogen

Question 6

The group of organic compounds containing carbon, hydrogen, and oxygen in a near 1:2:1 ratio is defined as a
A) carbohydrate
B) lipid
C) protein
D) nucleic acid
E) both C and D

Answer 6

A) carbohydrate

Question 7

An example of a polysaccharide stored in humans is
A) cellulose
B) lactose
C) glucose
D) glycogen
E) mannose

Answer 7

D) glycogen

Question 8

When two monosaccharides undergo a dehydration synthesis
A) a new monosaccharide is formed
B) a disaccharide is formed
C) a polysaccharide is formed
D) a starch is formed
E) hydrolysis occurs

Answer 8

B) a disaccharide is formed

Question 9

Lipids
A) form essential structural component cells
B) provide roughly twice the energy as carbohydrates
C) help to maintain body temperature
D) all of the above
E) B and C only

Answer 9

E) B and C only

Question 10

A fatty acid that contains three double covalent bonds in its carbon chain is said to be
A) saturated
B) monounsaturated
C) polyunsaturated
D) hydrogenated
E) carboxylated

Answer 10

C) polyunsaturated

Question 11

Most of the fat found in the human body is in the form of
A) steroids
B) phospholipids
C) triglycerides
D) prostaglandins
E) monoglycerides

Answer 11

C) triglycerides

Question 12

Glycerol is the backbone molecule for:
A) disaccharides
B) DNA
C) peptides
D) triglycerides
E) ATP

Answer 12

D) triglycerides

Question 13

A fatty acid with only single covalent bonds is said to be:
A) oxidised
B) reduced
C) saturated
D) denatured
E) hydrolysed

Answer 13

C) saturated

Question 14

Cholesterol, phospholipids, and glycolipids are examples of
A) dietary fats
B) prostaglandins
C) structural lipids
D) lipid drugs
E) steroids

Answer 14

C) structural lipids

Question 15

A shortage of cholesterol in the body would interfere with the formation of
A) sex hormones
B) proteins
C) nucleic acids
D) glycogen
E) both A and C

Answer 15

A) sex hormones

Question 16

A(n) \_\_\_\_\_\_\_\_\_ accepts hydroxide ions in water and a(n) \_\_\_\_\_\_\_ releases hydrogen ions in water
A) acid; base
B) base; acid
C) compound; element
D) element; compound
E) molecule; acid

Answer 16

B) base; acid

Question 17

Ions with a positive charge are called ________.

Answer 17

Cations

Question 18

Ions with a negative charge are called _______.

Answer 18

Anions

Question 19

_______ molecules are compounds that contain carbon as the primary structural atom.

Answer 19

Organic

Question 20

A(n) ___________ is a homogeneous mixture containing a solvent and a solute.

Answer 20

Solution

Question 21

Molecules that readily dissolve in water are called _____.

Answer 21

Hydrophilic

Question 22

Glycogen and starch are examples of complex carbohydrates called _______.

Answer 22

Polysaccharides

Question 23

__________ fats are triglycerides that contain only single covalent bonds between carbon atoms.

Answer 23

Saturated

Question 24

The _________ of a solution is the negative logarithm of the hydrogen ion concentration expressed in ,olds per litre in the solution.

Answer 24

pH

Question 25

_________ are lipid molecules that form biological membranes.

Answer 25

Structural lipids (or phospholipids)