1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Flauer [41]
3 years ago
14

You dilute an original sample 1:30. You then count the number of yeast in the 1:30 dilution. You count an average of 7 cells in

the 1/25 mm2 sized boxes. What is the concentration, in cells/ml, of the original sample?
Biology
1 answer:
kompoz [17]3 years ago
6 0

Answer:

The concentration, in cells/ml, of the original sample is 52500 cells/ml

Explanation:

Given

- Average number of cells in 1/25 mm^2 sized box (considering 1 box) is 7

- The depth of each box of a hemocytometer is 0.1 mm

To find the Volume:

Volume = 1/25 mm^2 * 0.1 mm^3 = 0.004 mm^3

Concentration of cells in this volume

[Cells in the estimated volume] = 7/0.004 mm^3 = 1750 cells/mm^3.

Knowing 1 mm^3 = 1 ml,

cell count = 1750 cells/ml.

Using the dilution factor 1:30 to correct the calculation

Final cell count after correction =  1750* 30 = 52500 cells/ml

You might be interested in
What are 5 examples of coevolution from the movie Evolutionary Arms Race?
Step2247 [10]

Answer:

1. The adaptation of the garter snake to the increasing toxicity of the rough-skin newt

2. The development of antibiotic-resistance by the tuberculosis bacteria in prisoners in Russian prisons

3. The development of FIV-resistance in wildcats

4. The immunity to HIV in about 10% of caucasians due to mutations in their cells that occured among those who survived the Black Death.

5. The development of immunity to asthma in children exposed to livestock at an early age in Bavaria

Explanation:

Coevolution refers to the the evolution that occurs in two species of organisms due to the mutual interaction or interdependence of the two species. Due to this interaction among species, a change in one organism results in adaptive changes in the other organism as well.

Coevolution can occur is any of these relationships between organisms: predator-prey, mutualism, or commensalism.

In the movie, Evolutionary arms race, the following examples of coevolution were highlighted:

1. The adaptation of the garter snake to the increasing toxicity of the rough-skin newt.

2. The development of antibiotic-resistance by the tuberculosis bacteria in prisoners in Russian prisons.

3. The development of FIV-resistance in wildcats.

4. The immunity to HIV in about 10% of caucasians due to mutations in their cells that occured among those who survived the Black Death.

5. The development of immunity to asthma in children exposed to livestock at an early age in Bavaria.

7 0
3 years ago
Which of the following would be the best method for randomly choose in the next nucleotide to add to an imaginary DNA segment
romanna [79]

Answer: Blindly selecting from a bag filled with blue green red and yellow beads.

Explanation: I looked around on brainly and other websites since you did not provide the choices and I found out this answer. Let me know if it helped!

8 0
3 years ago
You will be working with acidic solutions, basic solutions, or both in this lab. what safety precautions should experimenters ta
SSSSS [86.1K]
<span>The experimenters should make sure they are using proper clothing and shoes while properly coverings the exposed skin areas. Apart from that they should take proper measures to protect their eyes with proper safety goggles. If using contact lenses rather use eye glasses instead of that.</span>
6 0
3 years ago
How are the testes and ovaries similar
denpristay [2]

Testes and ovaries are similar because hey are the same in that most of the reproductive organs of both sexes develop from similar embryonic tissue, meaning they are homologous. Both systems have gonads (male have testes and female have ovaries) that produce gametes (testes produce sperm and ovaries produce egg or ovum) and sex organs.

5 0
3 years ago
List the five conditions that disturb genetic equilibrium in a population. Explain.
Ivan
<span> No gene mutations occurring at that locus or the loci associated with the trait </span>
<span>• A large population size • Limited-to-no immigration, emigration, or migration (genetic flow) </span>
<span>• No natural selection on that locus or trait </span>
<span>• Random mating (panmixis) It can describe other types of equilibrium as well, especially in modeling contexts.</span>
6 0
3 years ago
Other questions:
  • In eukaryotes, alternative splicing of pre-mRNAs can result in the production of many structurally distinct proteins from inform
    5·1 answer
  • Tables display data in rows and columns true or false
    11·2 answers
  • Volcanoes _____. are caused by weathering are caused by tsunamis cause liquefaction are both constructive and destructive
    10·2 answers
  • Which of these products is formed during the metabolic reactions of cellular respiration
    7·2 answers
  • Un lanț si o rețea trofică....:)
    7·1 answer
  • HELO! This is photosynthesis
    12·1 answer
  • Please help me
    12·2 answers
  • The basic principle of taping is that all taping is based on all of the following except:
    8·1 answer
  • How does the four subsystem of the Earth connectwitheach other?​
    11·1 answer
  • What are the similarities between dna and rna molecules? (4 points)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!