Question 1

Polymers are a typical formation of ________ molecules.

Accepted Answer

A)  organic 
B)  inorganic 
C)  either organic or inorganic 
A)  organic 
B)  inorganic 
C)  either organic or inorganic

Question 2

Ionic bonds are considered to be strong chemical bonds.Yet,ions dissociate in water.Explain this apparent contradiction.

Accepted Answer

Molecules such as sodium chloride are bo

Question 3

A.Distinguish between the mass of a molecule and the mass of a mole,using NaCl in your example.
B.Calculate the mass of a mole of NaCl in g,using the mass of one Da (amu).
C.Calculate the mass of a dozen NaCl molecules,a dozen donuts,and a mole of donuts,assuming a 30 gram donut.

Accepted Answer

A.The mass of a molecule is determined b

Question 4

A molecule referred to as highly soluble is

Accepted Answer

A)  very likely to dissolve in water. 
B)  not very likely to dissolve in water. 
C)  called aqueous. 
D)  very likely to dissolve in water and is called aqueous. 
E)  not very likely to dissolve in water and is called aqueous. 
A)  very likely to dissolve in water. 
B)  not very likely to dissolve in water. 
C)  called aqueous. 
D)  very likely to dissolve in water and is called aqueous. 
E)  not very likely to dissolve in water and is called aqueous.

Question 5

Only free H+ contributes to the hydrogen ion concentration.
A) Answer: A

Accepted Answer

A) True 
 B)False

Question 6

You are a student intern in the research and development department of a pharmaceutical company.You have discovered a compound that destroys the common cold virus in cultured human cells.Chemical characterization reveals that carbon,hydrogen,and oxygen are present,in a 20:40:4 ratio of C:H:O.What chemical class is this compound? Experiments in rats show that neither oral nor injectable treatment with the compound was effective in destroying the virus.Discuss some possible reasons for this lack of effectiveness.

Accepted Answer

The relatively low amount of oxygen and

Question 7

Match each class of biomolecules to the correct statement about it.
-Composed of units called amino acids,these can be linked into chains over 100 peptides long.

Accepted Answer

A) carbohydrates 
B) lipids 
C) proteins 
D) nucleotides 
A) carbohydrates 
B) lipids 
C) proteins 
D) nucleotides

Question 8

The most important energy-transferring compound in cells is a nucleotide known as

Accepted Answer

A)  glucose. 
B)  fructose. 
C)  protein. 
D)  adenosine triphosphate. 
E)  deoxyribonucleic acid. 
A)  glucose. 
B)  fructose. 
C)  protein. 
D)  adenosine triphosphate. 
E)  deoxyribonucleic acid.

Question 9

The most important polar molecule is ________ because it is practically a universal solvent.

Accepted Answer

A)  water 
B)  bicarbonate 
C)  sodium chloride 
D)  magnesium sulfate 
E)  nucleic acid 
A)  water 
B)  bicarbonate 
C)  sodium chloride 
D)  magnesium sulfate 
E)  nucleic acid

Question 10

Water striders are insects that literally walk on water.These insects are frequently found living on ponds.If hydrogen bonds did not exist,how would this affect the life of water striders?

Accepted Answer

Hydrogen bonds are responsible for the s

Question 11

A double covalent bond is formed when atoms

Accepted Answer

A)  share one pair of electrons (a total of two). 
B)  share two pairs of electrons (a total of four). 
C)  swap two pairs of electrons. 
D)  transfer a pair of electrons from one atom to the other. 
E)  transfer two pairs of electrons from one atom to the other. 
A)  share one pair of electrons (a total of two). 
B)  share two pairs of electrons (a total of four). 
C)  swap two pairs of electrons. 
D)  transfer a pair of electrons from one atom to the other. 
E)  transfer two pairs of electrons from one atom to the other.

Question 12

Match the descriptions to the correct protein category.
-structural components

Accepted Answer

A) fibrous 
B) globular 
A) fibrous 
B) globular

Question 13

Match the descriptions to the correct protein category.
-soluble in water

Accepted Answer

A) fibrous 
B) globular 
A) fibrous 
B) globular

Question 14

A combination of two or more atoms that has physical and chemical properties that differ from the atoms that compose it is called a(n)________.

Accepted Answer

The answer of A combination of two or more atoms...

Question 15

Ions with a negative charge are called ________.

Accepted Answer

The answer of Ions with a negative charge are called...

Question 16

For the following questions,match the type of modulator with the best description below.
-covalent modulator

Accepted Answer

A) involved in phosphorylation 
B) cannot be displaced by competition 
C) bind to proteins away from the active site 
D) reversible antagonist 
A) involved in phosphorylation 
B) cannot be displaced by competition 
C) bind to proteins away from the active site 
D) reversible antagonist

Question 17

Molecules that readily dissolve in water are called ________.

Accepted Answer

hydrophili

Question 18

Match the symbol with the correct element:
-carbon

Accepted Answer

A) P 
B) Na 
C) Ca 
D) C 
E) K
F)Pb 
A) P 
B) Na 
C) Ca 
D) C 
E) K
F)Pb

Question 19

Cells regulate their level of activity by regulating the amount of proteins present in the cell at any given time,so an up regulation of enzymes would be expected to

Accepted Answer

A)  increase the level of productivity of chemical reactions that rely on them. 
B)  decrease the level of productivity of chemical reactions that rely on them. 
C)  increase the rate of reactions catalyzed by the enzymes. 
D)  decrease the rate of reactions catalyzed by the enzymes. 
E)  both decrease the level of productivity of chemical reactions that rely on them and decrease the rate of reactions catalyzed by the enzymes. 
A)  increase the level of productivity of chemical reactions that rely on them. 
B)  decrease the level of productivity of chemical reactions that rely on them. 
C)  increase the rate of reactions catalyzed by the enzymes. 
D)  decrease the rate of reactions catalyzed by the enzymes. 
E)  both decrease the level of productivity of chemical reactions that rely on them and decrease the rate of reactions catalyzed by the enzymes.

Question 20

Atoms in a covalent molecule

Accepted Answer

A)  share electrons in single pairs. 
B)  share electrons in double pairs. 
C)  share electrons in triple pairs. 
D)  share electrons singly, never in pairs. 
E)  can share electrons in single pairs, double pairs, or triple pairs. 
A)  share electrons in single pairs. 
B)  share electrons in double pairs. 
C)  share electrons in triple pairs. 
D)  share electrons singly, never in pairs. 
E)  can share electrons in single pairs, double pairs, or triple pairs.

Exam 2: Molecular Interactions

Polymers are a typical formation of ________ molecules.

Ionic bonds are considered to be strong chemical bonds.Yet,ions dissociate in water.Explain this apparent contradiction.

A.Distinguish between the mass of a molecule and the mass of a mole,using NaCl in your example. B.Calculate the mass of a mole of NaCl in g,using the mass of one Da (amu). C.Calculate the mass of a dozen NaCl molecules,a dozen donuts,and a mole of donuts,assuming a 30 gram donut.

A molecule referred to as highly soluble is

Only free H+ contributes to the hydrogen ion concentration. A) Answer: A

Match each class of biomolecules to the correct statement about it. -Composed of units called amino acids,these can be linked into chains over 100 peptides long.

The most important energy-transferring compound in cells is a nucleotide known as

The most important polar molecule is ________ because it is practically a universal solvent.

Water striders are insects that literally walk on water.These insects are frequently found living on ponds.If hydrogen bonds did not exist,how would this affect the life of water striders?

A double covalent bond is formed when atoms

Match the descriptions to the correct protein category. -structural components

Match the descriptions to the correct protein category. -soluble in water

A combination of two or more atoms that has physical and chemical properties that differ from the atoms that compose it is called a(n)________.

Ions with a negative charge are called ________.

For the following questions,match the type of modulator with the best description below. -covalent modulator

Molecules that readily dissolve in water are called ________.

Match the symbol with the correct element: -carbon

Cells regulate their level of activity by regulating the amount of proteins present in the cell at any given time,so an up regulation of enzymes would be expected to

Atoms in a covalent molecule

Introduction to Physiology

Compartmentation: Cells and Tissues

Energy and Cellular Metabolism

Membrane Dynamics

Communication, Integration, and Homeostasis

Introduction to the Endocrine System

Neurons: Cellular and Network Properties

The Central Nervous System

Sensory Physiology

Efferent Division: Autonomic and Somatic Motor Control

Muscles

Integrative Physiology I: Control of Body Movement

Cardiovascular Physiology

Blood Flow and the Control of Blood Pressure

Blood

Mechanics of Breathing

Gas Exchange and Transport

The Kidneys

Integrative Physiology II: Fluid and Electrolyte Balance

The Digestive System

Metabolism and Energy Balance

Endocrine Control of Growth and Metabolism

The Immune System

Integrative Physiology III: Exercise

Reproduction and Development

Filters

Only free H⁺ contributes to the hydrogen ion concentration. A) Answer: A