Question 1

Why do triglycerides yield more energy than carbohydrates?

Accepted Answer

A)   they have fewer removable electrons
B)   they have double bonds
C)   they contain glycerol
D)   they have more removable electrons
E)   fatty acids D

Question 2

The process by which the movement of internal bonds converts one type of organic compound to another is

Accepted Answer

A)   condensation.
B)   cleavage.
C)   functional group transfer.
D)   electron transfer.
E)   rearrangement. E

Question 3

Sucrose is composed of

Accepted Answer

A)   two molecules of fructose.
B)   two molecules of glucose.
C)   a molecule of fructose and a molecule of glucose.
D)   a molecule of fructose and a molecule of galactose.
E)   two molecules of glucose C

Question 4

A large molecule built of three to millions of subunits is a(n)

Accepted Answer

A)   monomer.
B)   ion.
C)   polymer.
D)   enzyme.
E)   functional unit.

Question 5

Selecting the Exception Four of the five answers listed below are functional groups. Select the exception.

Accepted Answer

A)   R group
B)   amino group
C)   carboxyl group
D)   hydroxyl group
E)   methyl group

Question 6

Which is the smallest portion of a substance that retains the properties of an element?

Accepted Answer

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

Question 7

Which type of bond makes water liquid?

Accepted Answer

A)   ionic
B)   covalent
C)   polar covalent
D)   nonpolar covalent
E)   hydrogen

Question 8

Which type of bond holds the two strands of DNA together?

Accepted Answer

A)   ionic
B)   network
C)   polar covalent
D)   hydrogen
E)   non-polar covalent

Question 9

Nucleotides are building blocks for

Accepted Answer

A)   proteins.
B)   steroids.
C)   lipids.
D)   carbohydrates.
E)   DNA, RNA, and ATP.

Question 10

Which simple sugar is the main energy source for body cells?

Accepted Answer

A)   fructose
B)   sucrose
C)   lactose
D)   glucose
E)   galactose

Question 11

Which of the following is NOT an element?

Accepted Answer

A)   water
B)   oxygen
C)   carbon
D)   chlorine
E)   hydrogen

Question 12

What makes water a solvent?

Accepted Answer

A)   Fats dissolve in it.
B)   Ions and polar molecules dissolve in it.
C)   It mixes well with alcohol.
D)   It evaporates easily.
E)   It contains no minerals.

Question 13

How do hydrophobic molecules interact with water?

Accepted Answer

A)   attracted to
B)   absorbed by
C)   repelled by
D)   mixed with
E)   polarized bond

Question 14

Which type of bond holds the nucleotide bases together in a DNA molecule?

Accepted Answer

A)   hydrogen
B)   covalent
C)   ionic
D)   network
E)   peptide

Question 15

Triglycerides yield how much more energy, gram for gram, than carbohydrates?

Accepted Answer

A)   twice as much
B)   three times as much
C)   four times as much
D)   one half as much
E)   about the same amount

Question 16

The bond in table salt (NaCl) is

Accepted Answer

A)   polar.
B)   ionic.
C)   covalent.
D)   double.
E)   nonpolar.

Question 17

The most abundant lipids in the body are

Accepted Answer

A)   oils.
B)   waxes.
C)   steroids.
D)   triglycerides.
E)   fatty acids.

Question 18

Match between columns
                        Premises: The bond type holding several molecules of water together.
The bond between the atoms of table salt.
The bond between the oxygen atoms of gaseous oxygen.
The bond that breaks when salts dissolve in water.
Atoms connected by this kind of bond share electrons.

Accepted Answer

The Answer of covalent. and peptide and ionic. and hydrogen is...

Question 19

Isotopes

Accepted Answer

A)   are identical in mass number to the "standard" element.
B)   contain a different number of electrons than the "standard" element.
C)   contain a different number of protons than the "standard" element.
D)   contain the same number of protons but a different number of neutrons than the "standard" element.
E)   are actually a different element than the "standard" element.

Question 20

A tracer is a substance with what attached to it?

Accepted Answer

A)   water
B)   carbon
C)   a radioisotope
D)   an ion
E)   a positron

Exam 2: Chemistry of Life