Connect Access Card for Biology
11th Edition
ISBN: 9781259670091
Author: Peter H Raven, George B Johnson Professor, Kenneth A. Mason Dr. Ph.D., Jonathan Losos Dr., Susan Singer
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 1, Problem 2S
The classic experiment by Pasteur (figure 1.4) tested the hypothesis that cells arise from other cells. In this experiment cell growth was measured following sterilization of broth in a swan-necked flask or in a flask with a broken neck.
a. Which variables were kept the same in these two experiments?
b. How does the shape of the flask affect the experiment?
c. Predict the outcome of each experiment based on the two hypotheses.
d. Some bacteria (germs) are capable of producing heat-resistant spores that protect the cell and allow it to continue to grow after the environment cools. How would the outcome of this experiment have been affected if spore-forming bacteria were present in the broth?
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In 1928, Frederick Griffith injected four groups of mice with different strains of the bacteria, Streptococcus pneumoniae. The smooth strain had a polysaccharide capsule that protected the bacteria from the mouse’s immune system. The rough strain did not have this capsule. The details of each group and the results of the experiment are shown in the table below.
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Chapter 1 Solutions
Connect Access Card for Biology
Ch. 1 - Prob. 1UCh. 1 - Prob. 2UCh. 1 - A hypothesis in biology is best described as a. a...Ch. 1 - Prob. 4UCh. 1 - The cell theory states that a. cells are small. b....Ch. 1 - The molecule DNA is important to biological...Ch. 1 - The organization of living systems is a. linear...Ch. 1 - The idea of evolution a. was original to Darwin....Ch. 1 - What is the significance of Pasteurs experiment to...Ch. 1 - Which of the following is NOT an example of...
Ch. 1 - How is the process of natural selection different...Ch. 1 - If you found a fossil for a modem organism next to...Ch. 1 - The theory of evolution by natural selection is a...Ch. 1 - In which domain of life would you find only...Ch. 1 - Evolutionary conservation occurs when a...Ch. 1 - Exobiology is the study of life on other planets....Ch. 1 - The classic experiment by Pasteur (figure 1.4)...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which statement best describes why antifungal treatments may have side effects to our own cells? A. Fungal cells and human cells both have cells walls made of cellulose B. Fungal cells and human cells both reproduce by budding C. Fungal cells and human cells both have flagella for movement D. Fungal cells and human cells both have a nucleus, 80s ribosome, and multiple shared organellesarrow_forwardIn the experiment by Bernard Davis, bacterial F+cells and F- cells were growing while separated by a filter. Filter pores allowed the passage of the liquid medium but not the bacteria cells. As a result: 1) prototype colonies grew well on minimal medium 2) F+ cells were converted to F- cells despite the physical separation 3)F- cells were converted F+ cells despite the physical separation 4)F+ cells were not converted to F- cells because of the physical separation 5) F- cells were not converted to F+ cells because of the physical separation 6)there was no growth of prototypes on minimal mediumarrow_forwardWhat is the significance of Pasteur’s experiment to test the germ hypothesis? a. It proved that heat can sterilize a broth. b. It demonstrated that cells can arise spontaneously. c. It demonstrated that some cells are germs. d. It demonstrated that cells can only arise from other cells.arrow_forward
- What would the results of Pasteur's swan-neck flask experiment have looked like if they supported the theory of spontaneous generation? B. What did Pasteur's experiments not prove? C. How would the presence of endospores in Louis Pasteur's nutrient solutions have affected his conclusions about spontaneous generation?arrow_forwardImagine that you discover a new type of bacteria in an environment that is exposed to oxygen. A. What type of bacteria might you have discovered? B. Propose a mechanism by which they can produce the energy neededarrow_forwardAccording to the endosymbiotic theory, why was it adaptive for the larger (host) cell to keep the engulfed cell alive, rather than digesting it as food? A. The host cell would have been poisoned if it had digested the engulfed cell. B. The host cell was able to survive anaerobic conditions with the engulfed cell alive. C. The engulfed cell provided the host cell with CO2 D. The engulfed cell provided the host cell with ATP. E. The engulfed cell allowed the host cell to metabolize glucose.arrow_forward
- An experiment began with 3 cells and ended with 96 cells. Assuming exponential growth, how many generations did the cells go through?arrow_forwardFor instance, what would happen if ice-minus bacterial genes were transferred to strains of bacteria that are accustomed to living under cold conditions? ( Should genetically engineered microbes be released even in “controlled” experiments that might result in beneficial applications of biotechnology? How do you think the scientific field can prevent the escape of genetically altered microbes in field experiments?arrow_forwardIn the create a cell experiment, is there any difference in the structure of the two cells? The two cells was plant and animalsarrow_forward
- Which of the following observations about a bacterium would distinguish it from the last eukaryotic common ancestor? a. A double-stranded DNA genome b. Lack of a membrane-bound structure surrounding the genome c. Fatty acids in the lipid bilayer of the plasma membrane d. Enclosed by a cell wallarrow_forwardWhich is a piece of evidence that supports the endosymbiotic theory? Select all that apply. (Group of answer choices) A. many bacteria are resistant to antibiotics B. eukaryotic cells have cell membranes C. mitochondria have their own DNA D. chloroplast DNA is more similar to cyanobacteria DNA than eukaryotic DNA E. ribosomes are present in eukaryotic cells F. mitochondria must divide to multiply, cells can't build themarrow_forwardWhat is the endosymbiotic theory? Discuss two lines of evidence that support the theory.arrow_forward
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