Biology
10th Edition
ISBN: 9780073383071
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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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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Students have asked these similar questions
Match the following questions
about the people who shaped the
field of Microbiology to the "BEST"
possible answer...
A. Used lenses to make drawings
of eukaryotes
B. His early work laid the
foundation for the study of plant
diseases
C. Discovered that organisms can
derive energy from several
different inorganic compounds
D. Conducted later experiments to
refute spontaneous generation
E. Carried out early widespread
vaccinations
F. His bacterial grouping system
laid the foundation for taxonomy
based on genetics
G. Published early accounts of
sexual transmitted diseases
H. Used lenses to make drawings
of prokaryotes
I. Conducted early experiments to
refute spontaneous generation
J. His bacterial grouping system
laid the foundation for taxonomy
based on morphology
A microbiology student was given a mixed culture of two different gram positive bacteria species to grow into a culture medium using correct aseptic techniques. After two days,one gram positive bacterial species grew on the media and the growth appeared red on the surface of the medium. Tthe second gram positive bacterial species grew and the growth appeared yellow on the surface of the medium. What is the possible explanation for the differences in the color of the bacterial growth?
A.
the culture was contaminated
B.
the microbiologist put too much inoculum on the culture medium
C.
the medium was a selective medium
D.
the medium was differential
We will perform a gram stain on our samples, so be sure to bring your instructions on gram staining.
Will this procedure stain all cells?
A. Yes, all prokaryotic and eukaryotic cells will be stained purple or pink.
B. All prokaryotic cells will be stained.
Eukaryotic cells will not be stained.
C.Mycobacteria and a few other groups with special cell wall structures will not be stained.
All other prokaryotic cells will be stained.
Eukaryotic cells will be stained pink.
D. Mycobacteria and a few other groups with special cell wall structures will not be stained.
All other prokaryotic cells will be stained.
Eukaryotic cells will be stained purple.
Chapter 1 Solutions
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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