Question 1

What is a biofilm?

Accepted Answer

A)  a movie about biology 
B)  a slimy covering around a bacterium that allows it to stick to surfaces 
C)  a colony of prokaryotes and eukaryotes living together in a slime 
D)  a substance put on microscope slides that allow microscopic details to be better seen 
E)  a shiny substance that develops above an oil slick 
A)  a movie about biology 
B)  a slimy covering around a bacterium that allows it to stick to surfaces 
C)  a colony of prokaryotes and eukaryotes living together in a slime 
D)  a substance put on microscope slides that allow microscopic details to be better seen 
E)  a shiny substance that develops above an oil slick

Question 2

When contaminated with E. coli strains toxic to humans, fresh meat should be cooked to at least ____ in order to prevent any food intoxication.

Accepted Answer

A)  71 ° C (160 ° F) 
B)  75 ° C (167 ° F) 
C)  65 ° C (149 ° F) 
D)  85 ° C (185 ° F) 
E)  91 ° C (196 ° F) 
A)  71 ° C (160 ° F) 
B)  75 ° C (167 ° F) 
C)  65 ° C (149 ° F) 
D)  85 ° C (185 ° F) 
E)  91 ° C (196 ° F)

Question 3

How do the plasma membranes of Archaea differ from the plasma membranes of Eukarya?

Accepted Answer

A)  their membranes are more rigid 
B)  their membrane phospholipids do not have fatty acids 
C)  their membrane phospholipids have reactive side chains 
D)  their membrane phospholipids form covalent bonds with one another 
E)  all of these are differences of the plasma membranes of Archaea 
A)  their membranes are more rigid 
B)  their membrane phospholipids do not have fatty acids 
C)  their membrane phospholipids have reactive side chains 
D)  their membrane phospholipids form covalent bonds with one another 
E)  all of these are differences of the plasma membranes of Archaea

Question 4

Which of the following cell features is absent in a bacterial cell?

Accepted Answer

A)  plasma membrane. 
B)  cytoplasm. 
C)  nucleoid. 
D)  nucleus. 
E)  DNA. 
A)  plasma membrane. 
B)  cytoplasm. 
C)  nucleoid. 
D)  nucleus. 
E)  DNA.

Question 5

Which of the following is the correct difference between rough endoplasmic reticula and smooth ER?

Accepted Answer

A)  rough ER is an extension of the nuclear envelope; smooth ER is not 
B)  smooth ER has a double bilayer membrane; rough ER does not 
C)  smooth ER consists of flattened sacs and tubes; rough ER does not 
D)  rough ER has a surface studded with ribosomes; smooth ER does not 
E)  smooth ER synthesizes proteins: rough ER does not 
A)  rough ER is an extension of the nuclear envelope; smooth ER is not 
B)  smooth ER has a double bilayer membrane; rough ER does not 
C)  smooth ER consists of flattened sacs and tubes; rough ER does not 
D)  rough ER has a surface studded with ribosomes; smooth ER does not 
E)  smooth ER synthesizes proteins: rough ER does not

Question 6

A flagellum is to a bacterium as ____ is to a boat.

Accepted Answer

A)  a captain 
B)  an engine 
C)  a propeller 
D)  a bow 
E)  an anchor 
A)  a captain 
B)  an engine 
C)  a propeller 
D)  a bow 
E)  an anchor

Question 7

Which of the following organelles has its own DNA and ribosomes?

Accepted Answer

A)  chloroplasts 
B)  rough endoplasmic reticulum 
C)  smooth endoplasmic reticulum 
D)  lysosomes 
E)  none of these organelles has its own DNA and ribosomes 
A)  chloroplasts 
B)  rough endoplasmic reticulum 
C)  smooth endoplasmic reticulum 
D)  lysosomes 
E)  none of these organelles has its own DNA and ribosomes

Question 8

How big are most cells?

Accepted Answer

A)  10-20 nanometers 
B)  10-20 micrometers 
C)  10-20 millimeters 
D)  10-20 centimeters 
E)  10-20 meters 
A)  10-20 nanometers 
B)  10-20 micrometers 
C)  10-20 millimeters 
D)  10-20 centimeters 
E)  10-20 meters

Question 9

In the fluid mosaic model of a typical plasma membrane, what accounts for the fluidity?

Accepted Answer

A)  the proteins, being large, cause the membrane to jiggle around. 
B)  the phospholipids collectively form a jelly-like substance similar to the cytoplasm. 
C)  the phospholipids are not bonded to each other and thus are more free to move around. 
D)  water molecules infiltrate the bilayer causing it to become more watery and thus more fluid. 
E)  the phospholipids in a typical plasma membrane form covalent bonds which are elastic and allow the membrane to 'stretch'. 
A)  the proteins, being large, cause the membrane to jiggle around. 
B)  the phospholipids collectively form a jelly-like substance similar to the cytoplasm. 
C)  the phospholipids are not bonded to each other and thus are more free to move around. 
D)  water molecules infiltrate the bilayer causing it to become more watery and thus more fluid. 
E)  the phospholipids in a typical plasma membrane form covalent bonds which are elastic and allow the membrane to 'stretch'.

Question 10

The phospholipids of plasma membranes have

Accepted Answer

A)  a hydrophobic head and a hydrophilic tail. 
B)  a hydrophobic head and a hydrophobic tail. 
C)  a hydrophobic head and two hydrophobic tails. 
D)  a hydrophilic head and two hydrophobic tails. 
E)  a hydrophilic head and two hydrophilic tails. 
A)  a hydrophobic head and a hydrophilic tail. 
B)  a hydrophobic head and a hydrophobic tail. 
C)  a hydrophobic head and two hydrophobic tails. 
D)  a hydrophilic head and two hydrophobic tails. 
E)  a hydrophilic head and two hydrophilic tails.

Question 11

Which of the following is true about all E.coli ?

Accepted Answer

A)  E.coli produce toxic proteins 
B)  E.coli is only found in cows, deer, goats, and sheep 
C)  E.coli is a common bacterium living in our intestines 
D)  E.coli originate from fresh produce 
E)  E.coli strains harmful to humans are also harmful to cattle 
A)  E.coli produce toxic proteins 
B)  E.coli is only found in cows, deer, goats, and sheep 
C)  E.coli is a common bacterium living in our intestines 
D)  E.coli originate from fresh produce 
E)  E.coli strains harmful to humans are also harmful to cattle

Question 12

Endoplasmic reticula are an extension of what other cellular structure?

Accepted Answer

A)  the cytoskeleton 
B)  flagella 
C)  cilia 
D)  the nuclear envelope 
E)  the plasma membrane 
A)  the cytoskeleton 
B)  flagella 
C)  cilia 
D)  the nuclear envelope 
E)  the plasma membrane

Question 13

Some bacteria have membranes around their DNA. What is lacking in these membranes that we do not call them nuclei?

Accepted Answer

A)  pores 
B)  proteins 
C)  phospholipids 
D)  a bilayer construction 
E)  more than one of these is lacking 
A)  pores 
B)  proteins 
C)  phospholipids 
D)  a bilayer construction 
E)  more than one of these is lacking

Question 14

Which of the following is a characteristic of the plasma membrane?

Accepted Answer

A)  it controls the contents of the cell 
B)  the main lipid of a cell membrane is cholesterol 
C)  carbohydrates carry out most of the cell's dynamic functions 
D)  it encloses a jellylike mixture called a cytoplastic reticulum 
E)  all of these are characteristics of plasma membranes 
A)  it controls the contents of the cell 
B)  the main lipid of a cell membrane is cholesterol 
C)  carbohydrates carry out most of the cell's dynamic functions 
D)  it encloses a jellylike mixture called a cytoplastic reticulum 
E)  all of these are characteristics of plasma membranes

Question 15

Which of the following is NOT a characteristic of mitochondria?

Accepted Answer

A)  they are the sites of anaerobic respiration 
B)  they have a double membrane 
C)  they make ATP 
D)  they have their own ribosomes 
E)  all of these are characteristics of mitochondria 
A)  they are the sites of anaerobic respiration 
B)  they have a double membrane 
C)  they make ATP 
D)  they have their own ribosomes 
E)  all of these are characteristics of mitochondria

Question 16

Which of the following is true about bacteria?

Accepted Answer

A)  most bacteria are harmful 
B)  bacteria only inhabit surfaces 
C)  we have more bacteria cells that our own cells 
D)  bacteria are restricted in their distribution to certain ecosystems 
E)  bacteria are the most common organisms in the Domain Eukarya 
A)  most bacteria are harmful 
B)  bacteria only inhabit surfaces 
C)  we have more bacteria cells that our own cells 
D)  bacteria are restricted in their distribution to certain ecosystems 
E)  bacteria are the most common organisms in the Domain Eukarya

Question 17

The organelle that pinches off portions of its membrane to form a vesicle used for storage or transport is the

Accepted Answer

A)  mitochondrion. 
B)  chloroplast. 
C)  nucleus. 
D)  Golgi body. 
E)  ribosome. 
A)  mitochondrion. 
B)  chloroplast. 
C)  nucleus. 
D)  Golgi body. 
E)  ribosome.

Question 18

E. coli strains toxic to humans live in the intestine of ____ without sickening them.
I. birds and frogs
II. goats and sheep
III. cattle and deer

Accepted Answer

A)  I only 
B)  I and II 
C)  II and III 
D)  I and III 
E)  all of these 
A)  I only 
B)  I and II 
C)  II and III 
D)  I and III 
E)  all of these

Question 19

The relative impermeability of membranes to water soluble molecules is a result of

Accepted Answer

A)  the nonpolar nature of water. 
B)  the presence of large proteins that extend through both sides of membranes. 
C)  the presence of inorganic salt crystals scattered through some membranes. 
D)  the presence of cellulose and waxes. 
E)  the presence of phospholipids in the lipid bilayer. 
A)  the nonpolar nature of water. 
B)  the presence of large proteins that extend through both sides of membranes. 
C)  the presence of inorganic salt crystals scattered through some membranes. 
D)  the presence of cellulose and waxes. 
E)  the presence of phospholipids in the lipid bilayer.

Question 20

Meat, fruits, and vegetables could be contaminated with E. coli strains toxic to humans when they come in contact with animal
I. feces.
II. urine.
III. blood.

Accepted Answer

A)  I only 
B)  I and II 
C)  II and III 
D)  I and III 
E)  I, II, and III 
A)  I only 
B)  I and II 
C)  II and III 
D)  I and III 
E)  I, II, and III

Exam 3: Cell Structure

What is a biofilm?

When contaminated with E. coli strains toxic to humans, fresh meat should be cooked to at least ____ in order to prevent any food intoxication.

How do the plasma membranes of Archaea differ from the plasma membranes of Eukarya?

Which of the following cell features is absent in a bacterial cell?

Which of the following is the correct difference between rough endoplasmic reticula and smooth ER?

A flagellum is to a bacterium as ____ is to a boat.

Which of the following organelles has its own DNA and ribosomes?

How big are most cells?

In the fluid mosaic model of a typical plasma membrane, what accounts for the fluidity?

The phospholipids of plasma membranes have

Which of the following is true about all E.coli ?

Endoplasmic reticula are an extension of what other cellular structure?

Some bacteria have membranes around their DNA. What is lacking in these membranes that we do not call them nuclei?

Which of the following is a characteristic of the plasma membrane?

Which of the following is NOT a characteristic of mitochondria?

Which of the following is true about bacteria?

The organelle that pinches off portions of its membrane to form a vesicle used for storage or transport is the

E. coli strains toxic to humans live in the intestine of ____ without sickening them. I. birds and frogs II. goats and sheep III. cattle and deer

The relative impermeability of membranes to water soluble molecules is a result of

Meat, fruits, and vegetables could be contaminated with E. coli strains toxic to humans when they come in contact with animal I. feces. II. urine. III. blood.

Invitation to Biology

Molecules of Life

Energy and Metabolism

Capturing and Releasing Energy

Dna Structure and Function

Gene Expression and Control

How Cells Reproduce

Patterns of Inheritance

Biotechnology

Evidence of Evolution

Processes of Evolution

Early Life Forms and the Viruses

Plants and Fungi

Animal Evolution

Population Ecology

Communities and Ecosystems

The Biosphere and Human Effects

Animal Tissues and Organs

How Animals Move

Circulation and Respiration

Immunity

Digestion and Excretion

Neural Control and the Senses

Endocrine Control

Reproduction and Development

Plant Form and Function

Plant Reproduction and Development

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