Question 1

A decrease of hydrogen ions in the body fluids can have disastrous results because

Accepted Answer

A)  decreased hydrogen ions can break chemical bonds. 
B)  decreased hydrogen ions can change the shape of large complex molecules, rendering them nonfunctional. 
C)  decreased hydrogen ions can disrupt tissue functions. 
D)  decreased hydrogen ions can kill living cells. 
E)  all of the above E

Question 2

If an element is composed of atoms with an atomic number of 8 and a mass number of 14, then a neutral atom of this element contains

Accepted Answer

A)  6 protons. 
B)  6 neutrons. 
C)  6 electrons. 
D)  14 protons. 
E)  14 electrons. B

Question 3

Chemical reactions that occur in the human body are controlled by special protein molecules called _________________________.

Accepted Answer

enzymes

Question 4

The most important metabolic fuel molecule in the body is

Accepted Answer

A)  sucrose. 
B)  starch. 
C)  protein. 
D)  vitamin B12. 
E)  glucose.

Question 5

Using the figure above, identify the labeled part.
-Label L: ________

Accepted Answer

The answer of  Using the figure above, identify the...

Question 6

Which of the following is unique to RNA?

Accepted Answer

A)  glucose 
B)  phosphate group 
C)  ribose 
D)  adenosine triphosphate 
E)  deoxyribose

Question 7

Which of the following is a weak electrical attraction between molecules?

Accepted Answer

A)  ionic bond 
B)  covalent bond 
C)  polar bond 
D)  metallic bond 
E)  hydrogen bond

Question 8

Using the figure above, identify the labeled part.
-Label H: ________

Accepted Answer

The answer of  Using the figure above, identify the...

Question 9

The best definition of organic material is anything that

Accepted Answer

A)  contains carbon. 
B)  contains carbon, oxygen, and hydrogen covalently bonded. 
C)  contains carbon, nitrogen, and hydrogen covalently bonded. 
D)  contains hydrogen covalently bonded. 
E)  contains carbon and hydrogen covalently bonded.

Question 10

AB → A + B is to decomposition as A + B ↔ AB is to

Accepted Answer

A)  exchange. 
B)  reversible. 
C)  combustion. 
D)  replacement. 
E)  metabolism.

Question 11

A class of lipids used to signal cells to undergo changes is called

Accepted Answer

A)  steroids. 
B)  phospholipids. 
C)  triglycerides. 
D)  hormones. 
E)  monoglycerides.

Question 12

Using the figure above, identify the labeled part.
-Label J: ________

Accepted Answer

The answer of  Using the figure above, identify the...

Question 13

Which of the following would have a negative charge?

Accepted Answer

A)  an atom 
B)  a molecule 
C)  a proton 
D)  a neutron 
E)  an electron

Question 14

_________________________ are soluble inorganic compounds whose ions will conduct an electric current in solutions.

Accepted Answer

The answer of _________________________ are soluble inorganic compounds whose ions...

Question 15

How many electrons do MOST atoms need in their outer shell to be stable?

Accepted Answer

A)  two 
B)  three 
C)  four 
D)  six 
E)  eight

Question 16

Covalent bonds are formed when

Accepted Answer

A)  atoms share electrons. 
B)  cations and anions are held together by their opposite charges. 
C)  a pair of electrons is shared unequally by two atoms. 
D)  hydrogen forms bonds with negatively charged atoms in the same or different molecules. 
E)  two or more atoms lose electrons at the same time.

Question 17

Which statement about the reaction H2 + Cl2 → 2HCl is correct?

Accepted Answer

A)  H2 and Cl2 are the products. 
B)  HCl is the product. 
C)  One molecule of hydrogen contains one atom. 
D)  One molecule of chlorine contains one atom. 
E)  All of the above are correct.

Question 18

A solution containing more hydrogen ions than hydroxide ions is

Accepted Answer

A)  acidic. 
B)  basic. 
C)  neutral. 
D)  alkaline. 
E)  none of the above

Question 19

All of the elements and compounds that are eaten and used by the body for some function are called

Accepted Answer

A)  inorganic compounds. 
B)  organic compounds. 
C)  nutrients. 
D)  metabolites. 
E)  enzymes.

Question 20

Which of the following is a characteristic of hydrogen bonds?

Accepted Answer

A)  Hydrogen bonds are strong attractive forces between hydrogen atoms and negatively charged atoms. 
B)  Hydrogen bonds occur ONLY in water. 
C)  Hydrogen bonds can form between neighboring molecules. 
D)  Hydrogen bonds are part of fatty-acid structure. 
E)  Hydrogen bonds are part of carbohydrate structure.

Exam 2: The Chemical Level of Organization

A decrease of hydrogen ions in the body fluids can have disastrous results because

If an element is composed of atoms with an atomic number of 8 and a mass number of 14, then a neutral atom of this element contains

Chemical reactions that occur in the human body are controlled by special protein molecules called _________________________.

The most important metabolic fuel molecule in the body is

Using the figure above, identify the labeled part. -Label L: ________

Which of the following is unique to RNA?

Which of the following is a weak electrical attraction between molecules?

Using the figure above, identify the labeled part. -Label H: ________

The best definition of organic material is anything that

AB → A + B is to decomposition as A + B ↔ AB is to

A class of lipids used to signal cells to undergo changes is called

Using the figure above, identify the labeled part. -Label J: ________

Which of the following would have a negative charge?

_________________________ are soluble inorganic compounds whose ions will conduct an electric current in solutions.

How many electrons do MOST atoms need in their outer shell to be stable?

Covalent bonds are formed when

Which statement about the reaction H₂ + Cl₂ → 2HCl is correct?

A solution containing more hydrogen ions than hydroxide ions is

All of the elements and compounds that are eaten and used by the body for some function are called

Which of the following is a characteristic of hydrogen bonds?