Question 1

In a DNA molecule,the phosphate serves ________.

Accepted Answer

A)  as a code 
B)  to hold the molecular backbone together 
C)  as nucleotides 
D)  to bind the sugars to their bases 
A)  as a code 
B)  to hold the molecular backbone together 
C)  as nucleotides 
D)  to bind the sugars to their bases B

Question 2

Match the following:
-Homogeneous,will not settle.

Accepted Answer

A) Solutions 
B) Suspensions 
C) Colloids 
A) Solutions 
B) Suspensions 
C) Colloids A

Question 3

Name at least four things you know about enzymes.

Accepted Answer

1.Most are proteins.
2.They have specific binding sites for specific substrates.
3.They lower the activation barrier for a specific reaction.
4.The names often end in "ase."
5.They can be denatured.
6.They can be used again and again.

Question 4

An atom with 3 electrons in its outermost (valence)shell may have a total of ________ electrons altogether.

Accepted Answer

A)  13 
B)  8 
C)  17 
D)  3 
A)  13 
B)  8 
C)  17 
D)  3

Question 5

What happens in redox reactions?

Accepted Answer

A)  the electron acceptor is oxidized 
B)  the organic substance that loses hydrogen is usually reduced 
C)  both decomposition and electron exchange occur 
D)  the reaction is uniformly reversible 
A)  the electron acceptor is oxidized 
B)  the organic substance that loses hydrogen is usually reduced 
C)  both decomposition and electron exchange occur 
D)  the reaction is uniformly reversible

Question 6

What happens when globular proteins are denatured?

Accepted Answer

The active

Question 7

Match the following:
-Usually,the first one or two letters of an element's name.

Accepted Answer

A) Atomic symbol 
B) Mass number of an element 
C) Atomic number 
A) Atomic symbol 
B) Mass number of an element 
C) Atomic number

Question 8

A 65-year-old patient came to the emergency room with complaints of severe heartburn unrelieved by taking a "large handful" of antacids.Would you expect the pH to be high or low? Explain why.

Accepted Answer

You would expect a high pH.Taking antaci

Question 9

Match the following particles to the correct description:
-Combination of two or more atoms of the same element held together by chemical bonds.

Accepted Answer

A) Atom 
B) Nuetron 
C) Cation 
D) Molecule 
A) Atom 
B) Nuetron 
C) Cation 
D) Molecule

Question 10

Which of the following would be regarded as an organic molecule?

Accepted Answer

A)  NaCl 
B)  H2O 
C)  CH4 
D)  NaOH 
A)  NaCl 
B)  H2O 
C)  CH4 
D)  NaOH

Question 11

Match the following:
-Will not scatter light.

Accepted Answer

A) Solutions 
B) Suspensions 
C) Colloids 
A) Solutions 
B) Suspensions 
C) Colloids

Question 12

Match the following:
-Heterogeneous,will settle.

Accepted Answer

A) Solutions 
B) Suspensions 
C) Colloids 
A) Solutions 
B) Suspensions 
C) Colloids

Question 13

Match the following:
-Although a man who weighs 175 pounds on Earth would be lighter on the moon and heavier on Jupiter,his ________ would not be different.

Accepted Answer

A) Weight 
B) Mass 
C) Matter 
D) Energy 
A) Weight 
B) Mass 
C) Matter 
D) Energy

Question 14

Salivary amylase is an enzyme produced by the salivary glands that breaks down carbohydrates.What will happen to this enzyme as it follows the food into the stomach where the pH drops to 2.5?

Accepted Answer

A)  The enzyme will assume an alternate form and catalyze additional reactions. 
B)  The enzyme will denature and become inactive. 
C)  The enzyme will continue to function as it remains unchanged in chemical reactions. 
D)  The enzyme will denature but retain its function. 
A)  The enzyme will assume an alternate form and catalyze additional reactions. 
B)  The enzyme will denature and become inactive. 
C)  The enzyme will continue to function as it remains unchanged in chemical reactions. 
D)  The enzyme will denature but retain its function.

Question 15

Isotopes differ from each other only in the number of electrons the atom contains.

Accepted Answer

A) True 
 B)False

Question 16

Explain why chemical reactions in the body are often irreversible.

Accepted Answer

Chemical reactions that release energy c

Question 17

A high fever causes an enzyme to lose its three dimensional structure and function.Which bonds are broken when a protein denatures?

Accepted Answer

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

Question 18

The lower the pH,the higher the hydrogen ion concentration.

Accepted Answer

A) True 
 B)False

Question 19

Match the following chemical bonds to the correct description:
-A bond in which electrons are shared unequally.

Accepted Answer

A) Nonpolar covalent bond 
B) Polar covalent bond 
C) Ionic bond 
D) Hydrogen bond 
A) Nonpolar covalent bond 
B) Polar covalent bond 
C) Ionic bond 
D) Hydrogen bond

Question 20

Match the following particles to the correct description:
-Smallest particle of an element that retains its properties.

Accepted Answer

A) Atom 
B) Nuetron 
C) Cation 
D) Molecule 
A) Atom 
B) Nuetron 
C) Cation 
D) Molecule

Exam 2: Chemistry Comes Alive

In a DNA molecule,the phosphate serves ________.

Match the following: -Homogeneous,will not settle.

Name at least four things you know about enzymes.

An atom with 3 electrons in its outermost (valence)shell may have a total of ________ electrons altogether.

What happens in redox reactions?

What happens when globular proteins are denatured?

Match the following: -Usually,the first one or two letters of an element's name.

A 65-year-old patient came to the emergency room with complaints of severe heartburn unrelieved by taking a "large handful" of antacids.Would you expect the pH to be high or low? Explain why.

Match the following particles to the correct description: -Combination of two or more atoms of the same element held together by chemical bonds.

Which of the following would be regarded as an organic molecule?

Match the following: -Will not scatter light.

Match the following: -Heterogeneous,will settle.

Match the following: -Although a man who weighs 175 pounds on Earth would be lighter on the moon and heavier on Jupiter,his ________ would not be different.

Salivary amylase is an enzyme produced by the salivary glands that breaks down carbohydrates.What will happen to this enzyme as it follows the food into the stomach where the pH drops to 2.5?

Isotopes differ from each other only in the number of electrons the atom contains.

Explain why chemical reactions in the body are often irreversible.

A high fever causes an enzyme to lose its three dimensional structure and function.Which bonds are broken when a protein denatures?

The lower the pH,the higher the hydrogen ion concentration.

Match the following chemical bonds to the correct description: -A bond in which electrons are shared unequally.

Match the following particles to the correct description: -Smallest particle of an element that retains its properties.

The Human Body: an Orientation

Cells: the Living Units

Tissue: the Living Fabric

The Integumentary System

Bones and Skeletal Tissue

The Skeleton

Joints

Muscles and Muscle Tissue

The Muscular System

Fundamentals of the Nervous System and Nervous Tissue

The Central Nervous System

The Peripheral Nervous System and Reflex Activity

The Autonomic Nervous System

The Special Senses

The Endocrine System

Blood

The Cardiovascular System: the Heart

The Cardiovascular System: Blood Vessels

The Lymphatic System and Lymphoid Organs and Tissues

The Immune System: Innate and Adaptive Body Defenses

The Respiratory System

The Digestive System

Nutrition,metabolism,and Body Temperature Regulation

The Urinary System

Fluid,electrolyte,and Acid-Base Balance

The Reproductive System

Pregnancy and Human Development

Heredity

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