
Concept explainers
a.
To describe:
The number of bacterial cells that are present 3 hours after introducing 20 bacterial cells to the pasta salad, assuming that the generation time is 20 minutes.
Concept introduction:
Exponential growth involves a growth in the cell population by a factor of 2. These populations contain a high number of cells; therefore they are represented as exponents. When the exponential number and time graph is plotted, the line comes out to be straight, representing exponential growth.
Doubling time is the time taken by a bacterial cell to form two daughter cells, after completing a fission cycle. It is also referred to as generation and is a constant process under favorable conditions. In bacteria, each doubling time leads to a doubling of their population. This process leads to an exponential growth in their population. Each exponent represents a generation in exponential growth.
b.
To describe:
The way in which microbial contamination of the salad could have been prevented or reduced.
Concept introduction:
Doubling time is the time taken by a bacterial cell to form two daughter cells, after completing a fission cycle. It is also referred to as generation and is a constant process under favorable conditions. In bacteria, each doubling time leads to a doubling of their population. This process leads to an exponential growth in their population. Each exponent represents a generation in exponential growth.

Want to see the full answer?
Check out a sample textbook solution
Chapter 7 Solutions
Microbiology: A Systems Approach
- In one paragraph show how atoms and they're structure are related to the structure of dna and proteins. Talk about what atoms are. what they're made of, why chemical bonding is important to DNA?arrow_forwardWhat are the structure and properties of atoms and chemical bonds (especially how they relate to DNA and proteins).arrow_forwardThe Sentinel Cell: Nature’s Answer to Cancer?arrow_forward
- Molecular Biology Question You are working to characterize a novel protein in mice. Analysis shows that high levels of the primary transcript that codes for this protein are found in tissue from the brain, muscle, liver, and pancreas. However, an antibody that recognizes the C-terminal portion of the protein indicates that the protein is present in brain, muscle, and liver, but not in the pancreas. What is the most likely explanation for this result?arrow_forwardMolecular Biology Explain/discuss how “slow stop” and “quick/fast stop” mutants wereused to identify different protein involved in DNA replication in E. coli.arrow_forwardMolecular Biology Question A gene that codes for a protein was removed from a eukaryotic cell and inserted into a prokaryotic cell. Although the gene was successfully transcribed and translated, it produced a different protein than it produced in the eukaryotic cell. What is the most likely explanation?arrow_forward
- Molecular Biology LIST three characteristics of origins of replicationarrow_forwardMolecular Biology Question Please help. Thank you For E coli DNA polymerase III, give the structure and function of the b-clamp sub-complex. Describe how the structure of this sub-complex is important for it’s function.arrow_forwardMolecular Biology LIST three characteristics of DNA Polymerasesarrow_forward
- Microbiology for Surgical Technologists (MindTap ...BiologyISBN:9781111306663Author:Margaret Rodriguez, Paul PricePublisher:Cengage Learning
- Principles Of Radiographic Imaging: An Art And A ...Health & NutritionISBN:9781337711067Author:Richard R. Carlton, Arlene M. Adler, Vesna BalacPublisher:Cengage Learning

