Question
In: Physics
a) E. coli swims at about 20 µm/s by rotating a bundle of helical flagella. If...
a) E. coli swims at about 20 µm/s by rotating a bundle of helical flagella. If the motors were to turn 10 times faster than normal, what would their swimming speed be? If their fluid environment were made 10 times more viscous, but the motors were to turn at the same rate, what would the swimming speed be? How does the power output of the motor change in these two hypothetical situations?
b) Two micron-sized spheres, one made of silver and the other gold, sediment (that is, fall under gravity) in a viscous fluid. The silver sphere has twice the radius of the gold one. Which sediments faster?
c) The left ventricle of the human heart expels about 50 cm3 of blood per heartbeat. Assuming a pulse rate of 1 heartbeat per second and a diameter of the aorta of about 2 cm, what is the mean velocity of blood in the aorta? What is the Reynolds number?
d) What is the Reynolds number of a swimming bacterium? A tadpole? A blue whale?
Solutions
genius_generous answered 2 years agoRelated Solutions
D. Describe the characteristics and function(s) of a bundle of alveoli. E. How does the diaphragm...
D. Describe the characteristics and function(s) of a bundle of
alveoli.
E. How does the diaphragm contribute to the mechanism of
ventilation?
1. The mixed culture in an experiment was prepared by mixing overnight E. coli and S....
1. The mixed culture in an experiment
was prepared by mixing overnight E. coli and S.
aureus cultures in the ratio 2:8. However, there seemed to be
more E. coli growth on the resulting streak plate than
S. aureus growth. Explain this.
2. It was observed that some colonies
of the same bacterial species appeared in different sizes on the
streak plates. Give the possible reason for this.
3. Is it better to prepare pure
culture in broth or on...
The bacteria E. Coli doubles in a little over 20 minutes in good lab conditions. (For...
The bacteria E. Coli doubles in a little over 20 minutes in good
lab conditions. (For purposes of this exercise, we will assume it
takes exactly 20 minutes.)
a) Write a difference equation that models the growth of an E.
Coli colony in a large nutrient dish, with an initial population of
y0=10000 bacteria, and time measured in increments of 20
minutes. What is the solution to this equation and initial
condition?
b) How would the equation change if the...
What are the specific players in the lac operon in E. coli and S. cerevisiae (trans-acting...
What are the specific players in the lac operon in E. coli and
S. cerevisiae (trans-acting factors and cis-elements)?
Compare and contrast the cell wall found in E. coli and in S. aureus. (8 marks)
Compare and contrast the cell wall found in E. coli and
in S. aureus.
Describe the growth pattern of E. coli, B subtilis, S. epidermis, B. cereus in broth
Describe the growth pattern of E. coli, B subtilis, S. epidermis,
B. cereus in broth
Diameter (mm) E. coli R/S Diameter (mm) S. aureus R/S Activity Range Oregano 27 54 Thyme...
Diameter (mm)
E. coli
R/S
Diameter (mm)
S.
aureus
R/S
Activity Range
Oregano
27
54
Thyme
26
54
Clove
14
18
Lavender
10
14
Sage
11
14
Chloramphenicol
14
27
Use the table to answer the
following 6 questions about essential oils.
Do essential oils appear to have the possibility of having some
practical antibacterial use? Explain your reasoning.
What could be some of the impracticalities and/or problems of
using essential oils as an antibacterial agent given the
information presented?...
E. coli often comes to mind when reading about proteins and discussing them and it often...
E. coli often comes to mind when reading about proteins and
discussing them and it often makes headlines in the news. My
challenge for this chapter's discussion topic is this: find a
recent (within the last month) news article that involves E. coli
and share it with the class. Why does it seem that this bacteria is
always in the news? Remember, this chapter is the protein chapter,
so why is E. coli so important to proteins and vice versa?...
Most of what we know about the lac operon of E. coli has come from genetic...
Most of what we know about the lac operon of E. coli has come
from genetic analysis of various mutants. See the following
genotype... How much expression would you expect to see in this
strain if the growth media has glucose but no lactose present?
I+P+O+Z+ CAP-
We'll use the numbers associated with transcription amounts as
described in lecture and in the problem sets. H
ere is the key for these genotypes:
A “plus” superscript indicates normal functioning part of...
Most of what we know about the lac operon of E. coli has come from genetic...
Most of what we know about the lac operon of E. coli has come
from genetic analysis of various mutants. See the following
genotype... How much expression would you expect to see in this
strain if the growth media has glucose but no lactose present?
I+P+O+Z+ CAP-
We'll use the numbers associated with transcription amounts as
described in lecture and in the problem sets. H
ere is the key for these genotypes:
A “plus” superscript indicates normal functioning part of...
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