Question 1

The Krebs cycle takes place in the

Accepted Answer

A)  ribosomes. 
B)  cytoplasm. 
C)  nucleus. 
D)  mitochondria. 
E)  chloroplasts. 
A)  ribosomes. 
B)  cytoplasm. 
C)  nucleus. 
D)  mitochondria. 
E)  chloroplasts. D

Question 2

Phagocytosis is a type of

Accepted Answer

A)  exocytosis. 
B)  osmosis. 
C)  cell membrane model. 
D)  endocytosis. 
E)  diffusion. 
A)  exocytosis. 
B)  osmosis. 
C)  cell membrane model. 
D)  endocytosis. 
E)  diffusion. D

Question 3

These are the primary cellular sites for the assembly of proteins.

Accepted Answer

A)  Golgi bodies 
B)  ribosomes 
C)  mitochondria 
D)  lysosomes 
E)  smooth endoplasmic reticula 
A)  Golgi bodies 
B)  ribosomes 
C)  mitochondria 
D)  lysosomes 
E)  smooth endoplasmic reticula B

Question 4

Chromosomes are visible only

Accepted Answer

A)  as chromatin. 
B)  during cell division. 
C)  in eukaryotic cells. 
D)  within the nucleolus. 
E)  through the use of transmission electron microscopy. 
A)  as chromatin. 
B)  during cell division. 
C)  in eukaryotic cells. 
D)  within the nucleolus. 
E)  through the use of transmission electron microscopy.

Question 5

Humans derive most of their energy from

Accepted Answer

A)  fats. 
B)  carbohydrates. 
C)  proteins. 
D)  nucleotides. 
E)  steroids. 
A)  fats. 
B)  carbohydrates. 
C)  proteins. 
D)  nucleotides. 
E)  steroids.

Question 6

When the body uses triglycerides as an energy source, what are they broken into?

Accepted Answer

A)  carbon dioxide and water 
B)  glucose and glycogen 
C)  glycerol and fatty acids 
D)  glucose and glycerol 
E)  glycogen and fatty acids 
A)  carbon dioxide and water 
B)  glucose and glycogen 
C)  glycerol and fatty acids 
D)  glucose and glycerol 
E)  glycogen and fatty acids

Question 7

The special functions performed by membranes are the result of

Accepted Answer

A)  the number of layers of phospholipids present. 
B)  concentration gradients of the interior contents. 
C)  lipids embedded in the protein layer. 
D)  steroids. 
E)  proteins in the lipid bilayer. 
A)  the number of layers of phospholipids present. 
B)  concentration gradients of the interior contents. 
C)  lipids embedded in the protein layer. 
D)  steroids. 
E)  proteins in the lipid bilayer.

Question 8

Which of these serves in the transition from glycolysis to the Krebs cycle?

Accepted Answer

A)  acetyl-CoA formation 
B)  conversion of PGAL to PGA 
C)  regeneration of reduced NAD+ 
D)  oxidative phosphorylation 
E)  substrate-level phosphorylation 
A)  acetyl-CoA formation 
B)  conversion of PGAL to PGA 
C)  regeneration of reduced NAD+ 
D)  oxidative phosphorylation 
E)  substrate-level phosphorylation

Question 9

Reactions that break large molecules into smaller ones are

Accepted Answer

A)  anabolic. 
B)  catabolic. 
C)  oxidative. 
D)  reducing. 
E)  ionic. 
A)  anabolic. 
B)  catabolic. 
C)  oxidative. 
D)  reducing. 
E)  ionic.

Question 10

These are the primary cellular sites for the extraction of energy from organic compounds.

Accepted Answer

A)  Golgi bodies 
B)  ribosomes 
C)  mitochondria 
D)  lysosomes 
E)  endoplasmic reticula 
A)  Golgi bodies 
B)  ribosomes 
C)  mitochondria 
D)  lysosomes 
E)  endoplasmic reticula

Question 11

People who have been infected with cholera bacteria but have no symptoms may still infect others. This is done by

Accepted Answer

A)  sneezing on another individual. 
B)  coughing on another individual. 
C)  kissing another individual. 
D)  blood transfusions. 
E)  passing feces into unsanitary water supplies. 
A)  sneezing on another individual. 
B)  coughing on another individual. 
C)  kissing another individual. 
D)  blood transfusions. 
E)  passing feces into unsanitary water supplies.

Question 12

Which of the following substances would be unlikely to function as a coenzyme?

Accepted Answer

A)  a water-soluble vitamin 
B)  a fat soluble vitamin 
C)  glucose 
D)  NAD+ 
E)  FAD 
A)  a water-soluble vitamin 
B)  a fat soluble vitamin 
C)  glucose 
D)  NAD+ 
E)  FAD

Question 13

Any substance that is present at the end of a reaction or a pathway is called a(n)

Accepted Answer

A)  reactant. 
B)  end product. 
C)  substrate. 
D)  intermediate. 
E)  chemical. 
A)  reactant. 
B)  end product. 
C)  substrate. 
D)  intermediate. 
E)  chemical.

Question 14

Most ATP is formed by the process of

Accepted Answer

A)  glycogenolysis. 
B)  phosphorylation. 
C)  cellular respiration. 
D)  fermentation. 
E)  anaerobic respiration. 
A)  glycogenolysis. 
B)  phosphorylation. 
C)  cellular respiration. 
D)  fermentation. 
E)  anaerobic respiration.

Question 15

Which of the following is capable of enzymatic activity?

Accepted Answer

A)  lipids 
B)  proteins 
C)  carbohydrates 
D)  minerals 
E)  vitamins 
A)  lipids 
B)  proteins 
C)  carbohydrates 
D)  minerals 
E)  vitamins

Question 16

When molecules are broken apart in respiration

Accepted Answer

A)  the heat produced is used to drive biological reactions. 
B)  the oxygen in the compounds that are broken apart is used as an energy source. 
C)  the energy released in respiration is channeled into molecules of ATP. 
D)  ATP is converted into ADP. 
E)  ADP is released as a waste product. 
A)  the heat produced is used to drive biological reactions. 
B)  the oxygen in the compounds that are broken apart is used as an energy source. 
C)  the energy released in respiration is channeled into molecules of ATP. 
D)  ATP is converted into ADP. 
E)  ADP is released as a waste product.

Question 17

Match between columns
                        Premises: Golgi bodies
microtubules
nucleus
DNA molecules
ribosomes
mitochondria
nucleoli
lysosomes
RNA molecules
peroxisomes

Accepted Answer

The Answer of extract energy stored in carbohydrates; synthesize ATP; is...

Question 18

Most of the molecules in cell membranes are

Accepted Answer

A)  proteins. 
B)  carbohydrates. 
C)  lipids. 
D)  phospholipids. 
E)  nucleic acids. 
A)  proteins. 
B)  carbohydrates. 
C)  lipids. 
D)  phospholipids. 
E)  nucleic acids.

Question 19

One of the reasons that most animal cells will not burst if too much water enters by osmosis is that

Accepted Answer

A)  the cell wall will protect it. 
B)  most body cells selectively move solutes out. 
C)  carrier proteins will remove excess water. 
D)  solute molecules will resist water molecules. 
E)  salts will absorb the water. 
A)  the cell wall will protect it. 
B)  most body cells selectively move solutes out. 
C)  carrier proteins will remove excess water. 
D)  solute molecules will resist water molecules. 
E)  salts will absorb the water.

Question 20

Unsaturated tails of lipids

Accepted Answer

A)  are hydrophilic. 
B)  are stable and tend to break apart. 
C)  give the membrane a fluid quality. 
D)  will break whenever exposed to phosphate ions. 
E)  act as carriers. 
A)  are hydrophilic. 
B)  are stable and tend to break apart. 
C)  give the membrane a fluid quality. 
D)  will break whenever exposed to phosphate ions. 
E)  act as carriers.

Exam 3: Cells and How They Work

The Krebs cycle takes place in the

Phagocytosis is a type of

These are the primary cellular sites for the assembly of proteins.

Chromosomes are visible only

Humans derive most of their energy from

When the body uses triglycerides as an energy source, what are they broken into?

The special functions performed by membranes are the result of

Which of these serves in the transition from glycolysis to the Krebs cycle?

Reactions that break large molecules into smaller ones are

These are the primary cellular sites for the extraction of energy from organic compounds.

People who have been infected with cholera bacteria but have no symptoms may still infect others. This is done by

Which of the following substances would be unlikely to function as a coenzyme?

Any substance that is present at the end of a reaction or a pathway is called a(n)

Most ATP is formed by the process of

Which of the following is capable of enzymatic activity?

When molecules are broken apart in respiration

Most of the molecules in cell membranes are

One of the reasons that most animal cells will not burst if too much water enters by osmosis is that

Unsaturated tails of lipids

Learning About Human Biology

Chemistry of Life

Tissues, Organs, and Organ Systems

The Skeletal System

The Muscular System

Circulation: the Heart and Blood Vessels

Blood

Immunity and Disease

The Respiratory System

Digestion and Nutrition

The Urinary System

The Nervous System

Sensory Systems

The Endocrine System

Reproductive Systems

Development and Aging

Cell Reproduction

Introduction to Genetics

Chromosomes and Human Genetics

DNA, Genes, and Biotechnology

Genes and Disease: Cancer

Principles of Evolution

Principles of Ecology

Human Impacts on the Biosphere

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