Question 1

ß-lactam antibiotics act by interfering with

Accepted Answer

A)  bacterial cell wall synthesis. 
B)  the uptake of bacteria. 
C)  bacterial cell division. 
D)  bacterial chromosome replication. 
E)  the ability of the bacteria to avoid the host's immune system. 
A)  bacterial cell wall synthesis. 
B)  the uptake of bacteria. 
C)  bacterial cell division. 
D)  bacterial chromosome replication. 
E)  the ability of the bacteria to avoid the host's immune system.

Question 2

Which of the following will result in diversifying selection?

Accepted Answer

A)  Giraffes with the longest necks can eat leaves from the tallest trees. 
B)  Male frogs that call softly do not attract mates, while those who call very loudly get eaten by predators. 
C)  In an environment with patches of black and white rocks, both black and white rabbits can hide, but gray rabbits are always visible and are eaten by predators. 
D)  Blue birds with fewer than four chicks do not pass on many genes, blue birds with four chicks can raise them all, and blue birds with more than four chicks risk all of them dying due to lack of food. 
E)  Black and white moths exist in an area where the trees on which they rest have been turned black by pollution. 
A)  Giraffes with the longest necks can eat leaves from the tallest trees. 
B)  Male frogs that call softly do not attract mates, while those who call very loudly get eaten by predators. 
C)  In an environment with patches of black and white rocks, both black and white rabbits can hide, but gray rabbits are always visible and are eaten by predators. 
D)  Blue birds with fewer than four chicks do not pass on many genes, blue birds with four chicks can raise them all, and blue birds with more than four chicks risk all of them dying due to lack of food. 
E)  Black and white moths exist in an area where the trees on which they rest have been turned black by pollution.

Question 3

Why doesn't a ß-lactam antibiotic prevent the growth of new host (human)cells?

Accepted Answer

A)  The host cells are slowed down by the antibiotic, but still grow faster than the bacteria. 
B)  The host cells are protected by a thick layer of cell wall peptidoglycan. 
C)  Osmosis only occurs in bacterial cells, never in human or animal cells. 
D)  The antibiotic only harms bacterial cell walls; the host cells do not have cell walls. 
E)  Antibiotics slow host cell growth, but after the bacteria are dead and the antibiotics are removed, the host cells can grow again. 
A)  The host cells are slowed down by the antibiotic, but still grow faster than the bacteria. 
B)  The host cells are protected by a thick layer of cell wall peptidoglycan. 
C)  Osmosis only occurs in bacterial cells, never in human or animal cells. 
D)  The antibiotic only harms bacterial cell walls; the host cells do not have cell walls. 
E)  Antibiotics slow host cell growth, but after the bacteria are dead and the antibiotics are removed, the host cells can grow again.

Question 4

Which of the following hypothetical antibiotics would treat bacterial infections by interfering with bacterial reproduction?

Accepted Answer

A)  one that changes one of the proteins on the cell membrane 
B)  one that interferes with cell membrane synthesis 
C)  one that enhances DNA replication 
D)  one that strengthens bacterial cell walls 
E)  one that enhances protein synthesis 
A)  one that changes one of the proteins on the cell membrane 
B)  one that interferes with cell membrane synthesis 
C)  one that enhances DNA replication 
D)  one that strengthens bacterial cell walls 
E)  one that enhances protein synthesis

Question 5

The African finch Pyrenestes is an example of

Accepted Answer

A)  directional selection. 
B)  diversifying selection. 
C)  guided selection. 
D)  stabilizing selection. 
E)  uniform selection. 
A)  directional selection. 
B)  diversifying selection. 
C)  guided selection. 
D)  stabilizing selection. 
E)  uniform selection.

Question 6

Drug-resistant populations of bacterial stains are a result of

Accepted Answer

A)  fast bacterial doubling time outpacing typical drug doses. 
B)  drugs or other selective environmental pressures. 
C)  binary fission. 
D)  manipulations in the lab to create new strains for research. 
E)  transmission from an infected person. 
A)  fast bacterial doubling time outpacing typical drug doses. 
B)  drugs or other selective environmental pressures. 
C)  binary fission. 
D)  manipulations in the lab to create new strains for research. 
E)  transmission from an infected person.

Question 7

Explain how interfering with cell wall production could kill Staphylococcus aureus.

Accepted Answer

When a bacterial cell divides,it must sy

Question 8

A species of small lizard has three color forms: pale gray,brown,and black.In its original range,the colors of the rocky environment were mixed from pale gray to very dark,and the population had an even mix of all three color forms.The blending of colors with the environment helps the lizards hide from predators.A group of these lizards ended up on an island with all gray rocks,and the island has no predators that eat lizards.What will the lizards look like in 50 years?

Accepted Answer

With no predators to affect wh

Question 9

Which is necessary for natural selection to proceed?

Accepted Answer

A)  variation within a population 
B)  a mechanism of inheritance 
C)  acquisition of adaptations 
D)  generations reproducing over time 
E)  All of the above. 
A)  variation within a population 
B)  a mechanism of inheritance 
C)  acquisition of adaptations 
D)  generations reproducing over time 
E)  All of the above.

Question 10

Why doesn't a ß-lactam antibiotic prevent the growth of new host (human)cells?

Accepted Answer

The ß-lactam interferes with the cell wa

Question 11

What percentage of people carry ANY form of Staphylococcus aureus on their skin or in their noses?

Accepted Answer

A)  1%-5% 
B)  5%-10% 
C)  10%-25% 
D)  30%-40% 
E)  50%-60% 
A)  1%-5% 
B)  5%-10% 
C)  10%-25% 
D)  30%-40% 
E)  50%-60%

Exam 14: Natural Selection and Adaptation Bugs That Resist Drugs

ß-lactam antibiotics act by interfering with

Which of the following will result in diversifying selection?

Why doesn't a ß-lactam antibiotic prevent the growth of new host (human)cells?

Which of the following hypothetical antibiotics would treat bacterial infections by interfering with bacterial reproduction?

The African finch Pyrenestes is an example of

Drug-resistant populations of bacterial stains are a result of

Explain how interfering with cell wall production could kill Staphylococcus aureus.

Which is necessary for natural selection to proceed?

Why doesn't a ß-lactam antibiotic prevent the growth of new host (human)cells?

What percentage of people carry ANY form of Staphylococcus aureus on their skin or in their noses?

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Chemistry and Molecules of Life Mission to Mars

Cell Function and Structure Wonder Drug

Nutrition,metabolism,enzymes the Peanut Butter Project

Energy Flow and Photosynthesis the Future of Fuel

Dietary Energy and Cellular Respiration Supersize Me

DNA Structure and Replication Biologically Unique

Genes to Proteins Medicine From Milk

Cell Division and Mitosis Natures Pharmacy

Mutations and Cancer Fighting Fate

Single-Gene Inheritance and Meiosis Rock for a Cause

Complex Inheritance Qa: Genetics

Stem Cells and Cell Differentiation Grow Your Own

A: Nonadaptive Evolution and Speciation Urban Evolution

B: Nonadaptive Evolution and Speciation Urban Evolution

Evidence for Evolution a Fish With Fingers

Life on Earth Qa: Evolution

Prokaryotic Diversity Lost City

A: Eukaryotic Diversity Rain Forest Riches

B: Eukaryotic Diversity Rain Forest Riches

Human Evolution Skin Deep

A: Population Ecology on the Tracks of Wolves and Moose

B: Population Ecology on the Tracks of Wolves and Moose

A: Community Ecology Whats Happening to Honey Bees

B: Community Ecology Whats Happening to Honey Bees

A: Ecosystem Ecology the Heat Is on

B: Ecosystem Ecology the Heat Is on

A: Sustainability the Makings of a Green City

B: Sustainability the Makings of a Green City

A: Overview of Physiology Man Versus Mountain

B: Overview of Physiology Man Versus Mountain

Digestive System Drastic Measures

A: Cardiovascular System Death in Bogalusa

B: Cardiovascular System Death in Bogalusa

Respiratory System Peak Performance

A: Central Nervous System Smoke on the Brain

B: Central Nervous System Smoke on the Brain

Reproductive System Too Many Multiples

Immune System Viral Mysteries

A: Plant Physiology

B: Plant Physiology

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