Biology, 06.03.2020 23:57 ladybugys

A. What is the doubling period of E. coli under optimum conditions?

b. If you start a culture at 5 PM with one E. coli cell, how many will you have at 8 AM the following morning, assuming that the bacteria experience optimum conditions all night? Show your work!

c. In fact, bacteria use up all the nutrients in standard medium by the time they reach a density of about 1010 cell/ml. In order to feed all the bacteria in part (b), how many liters of medium would you need? To put this in perspective, remember 1 liter is about 1 quart!

Answers: 3

Show answers

Answers

Answer from: anonymousanon

Explanation:

A. What is the doubling period of E. coli under optimum conditions?

b. If you start a culture at 5 PM with one E. coli cell, how many will you have at 8 AM the following morning, assuming that the bacteria experience optimum conditions all night? Show your work!

c. In fact, bacteria use up all the nutrients in standard medium by the time they reach a density of about $10^{10}$ cell/ml. In order to feed all the bacteria in part (b), how many liters of medium would you need? To put this in perspective, remember 1 liter is about 1 quart!

ANSWER

a. The doubling period of E. coli under optimum condition is 20 minutes.

b. The time from 5PM to 8AM is 15 hours.

Assuming the bacteria experiences optimum growth, that means its doubling time is 20 minutes.

In one hour, it would have doubled 3 times ( $\frac{60 minutes}{20 minutes}$ )

In 15 hours, it would have doubled [15*3] times = 45 times

That implies 45 generations

The total number of generations after n generation is calculated using the formula:

$2^{number of generations}$ * initial number of bacteria

since number of generation is 45, and initial number of bacteria is 1

= $2^{45}$ *1

=35184372088832

=3.5* $10^{13}$

Therefore, there will be 3.5* $10^{13}$ E. coli cells

c. If $10^{10}$ cells requires 1ml of nutrient

Then 3.5* $10^{13}$ cells require:

$\frac{3.5*10^{13} }{10^{10} }$ * 1ml

=3500ml

To convert to liter

1000ml = 1 liter

3500ml = $\frac{3500}{1000}$

=3.5 liters

You will need 3.5 liters of medium

Answer from: Quest

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

Answer from: Quest

Writing, you can revisit previous parts of the lesson by returning to the course map. be sure to refer to the lab’s student guide, which you can find on the first page of the lab experiment activity

Another question on Biology

Biology, 22.06.2019 10:20

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false

Answers: 2

Answer

Biology, 22.06.2019 15:20

What is required in the genotype of an individual to show a recessive trait? a.two recessive alleles b.at least one recessive allele c.no recessive alleles

Answers: 2

Answer

Biology, 22.06.2019 15:30

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit

Answers: 1

Answer

Biology, 22.06.2019 16:40

Introducing minvasive species to an ecosystem results in an increase in biodiversity is it true or false

Answers: 1

Answer

You know the right answer?

A. What is the doubling period of E. coli under optimum conditions?

b. If you start a c...

Questions