Question 1

Which of the following organic groups does a steroid belong to?

Accepted Answer

A) carbohydrate 
B) nucleic acid 
C) protein 
D) lipid 
E) vitamin 
A) carbohydrate 
B) nucleic acid 
C) protein 
D) lipid 
E) vitamin

Question 2

ATP

Accepted Answer

A) serves as the energy currency of the cell. 
B) can store,but cannot release energy in the cell. 
C) is a sugar found in transfer RNA. 
D) stores genetic information. 
E) is a nucleotide found in DNA. 
A) serves as the energy currency of the cell. 
B) can store,but cannot release energy in the cell. 
C) is a sugar found in transfer RNA. 
D) stores genetic information. 
E) is a nucleotide found in DNA.

Question 3

X-rays can be used to view bones because

Accepted Answer

A) x-rays can not pass through bone. 
B) x-rays pass through bone. 
C) x-rays react with bone. 
D) bones are less dense than soft tissue. 
A) x-rays can not pass through bone. 
B) x-rays pass through bone. 
C) x-rays react with bone. 
D) bones are less dense than soft tissue.

Question 4

An atom of chlorine has 17 protons and 18 neutrons.Which of the following statements is true?

Accepted Answer

A) Chlorine has an atomic number of 18. 
B) Chlorine atoms have 18 electrons. 
C) Chlorine has an atomic number of 35. 
D) Chlorine has 35 electrons. 
E) Chlorine has a mass number of 35. 
A) Chlorine has an atomic number of 18. 
B) Chlorine atoms have 18 electrons. 
C) Chlorine has an atomic number of 35. 
D) Chlorine has 35 electrons. 
E) Chlorine has a mass number of 35.

Question 5

Which of the following organic groups does an enzyme belong to?

Accepted Answer

A) nucleic acid 
B) lipid 
C) vitamin 
D) carbohydrate 
E) protein 
A) nucleic acid 
B) lipid 
C) vitamin 
D) carbohydrate 
E) protein

Question 6

Which of the following best describes a proton?

Accepted Answer

A) one negative charge,no mass,found in orbitals 
B) no charge,mass of one,found in nucleus 
C) one positive charge,mass of one,found in nucleus 
D) subatomic particle with no electric charge 
E) None of these choices is correct. 
A) one negative charge,no mass,found in orbitals 
B) no charge,mass of one,found in nucleus 
C) one positive charge,mass of one,found in nucleus 
D) subatomic particle with no electric charge 
E) None of these choices is correct.

Question 7

Which of the following chemical reactions best represents the decomposition of ATP?

Accepted Answer

A) ATP + ADP $\rightarrow$ ATP 
B) ATP + energy $\rightarrow$ ADP + H2O 
C) ATP + H2O $\rightarrow$ ADP + Pi + energy 
D) ADP + ADP + ADP $\rightarrow$ ATP 
E) ADP + Pi + energy $\rightarrow$ ATP + H2O 
A) ATP + ADP $\rightarrow$ ATP 
B) ATP + energy $\rightarrow$ ADP + H2O 
C) ATP + H2O $\rightarrow$ ADP + Pi + energy 
D) ADP + ADP + ADP $\rightarrow$ ATP 
E) ADP + Pi + energy $\rightarrow$ ATP + H2O

Question 8

The molecule used most frequently by cells as a fuel belongs to which of the following groups?

Accepted Answer

A) carbohydrates 
B) nucleic acids 
C) prostaglandins 
D) phospholipids 
E) steroids 
A) carbohydrates 
B) nucleic acids 
C) prostaglandins 
D) phospholipids 
E) steroids

Question 9

The primary structure of a protein is

Accepted Answer

A) the hydrogen bonds between amino acids. 
B) the folded,helical nature of the molecule. 
C) represented by multiple polypeptide chains. 
D) the sequence of amino acids in the polypeptide chain. 
E) the number of polypeptide chains in the molecule. 
A) the hydrogen bonds between amino acids. 
B) the folded,helical nature of the molecule. 
C) represented by multiple polypeptide chains. 
D) the sequence of amino acids in the polypeptide chain. 
E) the number of polypeptide chains in the molecule.

Question 10

The model that helps explain how an enzyme works is the

Accepted Answer

A) three-dimensional model. 
B) denaturation model. 
C) activation model. 
D) lock-and-key model. 
A) three-dimensional model. 
B) denaturation model. 
C) activation model. 
D) lock-and-key model.

Question 11

A cation is

Accepted Answer

A) a molecule that conducts electricity when placed in solution. 
B) an alteration in the three-dimensional structure of a protein. 
C) a positively charged ion. 
D) a combination of atoms held together by chemical bonds. 
E) a negatively charged ion. 
A) a molecule that conducts electricity when placed in solution. 
B) an alteration in the three-dimensional structure of a protein. 
C) a positively charged ion. 
D) a combination of atoms held together by chemical bonds. 
E) a negatively charged ion.

Question 12

In an x-ray film of the skeletal system,the dense tissue areas appear ______ because they ______ the x-rays; and the less dense tissues appear ______ because they ______ the x-rays.

Accepted Answer

A)  light,absorb; dark,do not absorb 
B)  dark,absorb; light,do not absorb 
C)  dark,do not absorb; light,do absorb 
D)  light,do not absorb; dark,aborb 
A)  light,absorb; dark,do not absorb 
B)  dark,absorb; light,do not absorb 
C)  dark,do not absorb; light,do absorb 
D)  light,do not absorb; dark,aborb

Question 13

The molecular formula H2O means

Accepted Answer

A) 1 hydrogen atom and 2 oxygen atoms. 
B) 1 hydrogen atom and 1 oxygen atom. 
C) 2 hydrogen atoms and 1 oxygen atom. 
D) 2 hydrogen atoms and 2 oxygen atoms. 
E) None of these choices is correct. 
A) 1 hydrogen atom and 2 oxygen atoms. 
B) 1 hydrogen atom and 1 oxygen atom. 
C) 2 hydrogen atoms and 1 oxygen atom. 
D) 2 hydrogen atoms and 2 oxygen atoms. 
E) None of these choices is correct.

Question 14

Which of the following statements is false?

Accepted Answer

A) Water transports nutrients in the body. 
B) Water evaporation heats the body. 
C) Water evaporation cools the body. 
D) Water serves as an effective lubricant in our bodies. 
E) Water allows the body to resist sudden temperature changes. 
A) Water transports nutrients in the body. 
B) Water evaporation heats the body. 
C) Water evaporation cools the body. 
D) Water serves as an effective lubricant in our bodies. 
E) Water allows the body to resist sudden temperature changes.

Question 15

Normal pH for blood is 7.35 to 7.45.Maintenance of the pH in this range is

Accepted Answer

A) critical because enzymes work best within narrow ranges of pH. 
B) not critical because extreme pH values do not affect enzyme function. 
C) called denaturation. 
D) not required. 
E) None of these choices is correct. 
A) critical because enzymes work best within narrow ranges of pH. 
B) not critical because extreme pH values do not affect enzyme function. 
C) called denaturation. 
D) not required. 
E) None of these choices is correct.

Question 16

Normal pH range for blood is 7.35 to 7.45.If blood pH falls below 7.35,

Accepted Answer

A) the number of red blood cells decreases. 
B) the blood becomes saltier. 
C) an imbalance called acidosis results. 
D) an imbalance called alkalosis results. 
E) nothing happens as this is an acceptable deviation. 
A) the number of red blood cells decreases. 
B) the blood becomes saltier. 
C) an imbalance called acidosis results. 
D) an imbalance called alkalosis results. 
E) nothing happens as this is an acceptable deviation.

Question 17

A substance composed of two or more different types of atoms is a(n)

Accepted Answer

A) element. 
B) compound and a molecule. 
C) compound. 
D) molecule. 
E) ion. 
A) element. 
B) compound and a molecule. 
C) compound. 
D) molecule. 
E) ion.

Question 18

Which of the following molecules is NOT made from cholesterol?

Accepted Answer

A) testosterone 
B) progesterone 
C) bile salts 
D) estrogen 
E) prostaglandins 
A) testosterone 
B) progesterone 
C) bile salts 
D) estrogen 
E) prostaglandins

Question 19

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male.What kind of molecule is found at "E"?

Accepted Answer

A) water molecule 
B) polar covalent bond 
C) hydrogen atom 
D) oxygen atom 
E) hydrogen bond 
A) water molecule 
B) polar covalent bond 
C) hydrogen atom 
D) oxygen atom 
E) hydrogen bond

Question 20

Glycogen is the

Accepted Answer

A) storage carbohydrate in animals. 
B) storage carbohydrate in plants. 
C) sugar found in RNA. 
D) major nutrient for most body cells. 
E) nondigestible plant polysaccharide. 
A) storage carbohydrate in animals. 
B) storage carbohydrate in plants. 
C) sugar found in RNA. 
D) major nutrient for most body cells. 
E) nondigestible plant polysaccharide.

Exam 2: The Chemical Basis of Life

Which of the following organic groups does a steroid belong to?

ATP

X-rays can be used to view bones because

An atom of chlorine has 17 protons and 18 neutrons.Which of the following statements is true?

Which of the following organic groups does an enzyme belong to?

Which of the following best describes a proton?

Which of the following chemical reactions best represents the decomposition of ATP?

The molecule used most frequently by cells as a fuel belongs to which of the following groups?

The primary structure of a protein is

The model that helps explain how an enzyme works is the

A cation is

In an x-ray film of the skeletal system,the dense tissue areas appear ______ because they ______ the x-rays; and the less dense tissues appear ______ because they ______ the x-rays.

The molecular formula H2O means

Which of the following statements is false?

Normal pH for blood is 7.35 to 7.45.Maintenance of the pH in this range is

Normal pH range for blood is 7.35 to 7.45.If blood pH falls below 7.35,

A substance composed of two or more different types of atoms is a(n)

Which of the following molecules is NOT made from cholesterol?

-Water accounts for 50% of the weight of a young adult female and 60% of a young adult male.What kind of molecule is found at "E"?

Glycogen is the

The Human Organism

Cell Biology

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Histology and Physiology

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: the Heart

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition,metabolism,and Temperature Regulation

Urinary System

Water,electrolyte,and Acid-Based Balance

Reproductive System

Development,growth,aging,and Genetics

Filters

In an x-ray film of the skeletal system,the dense tissue areas appear because they the x-rays; and the less dense tissues appear because they the x-rays.

The molecular formula H₂O means