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
Ilia_Sergeevich [38]
2 years ago
13

A 10-7 is performed on a culture of bacteria in order to perform viable plate counts. From the dilution, *0.1 mL* of solution is

plated on solid media, and 66 colonies of bacteria grow on the plate. Assuming each colony came from a single bacterium, how many bacteria are in a single mL of the original culture?
Biology
1 answer:
marishachu [46]2 years ago
5 0

Answer:

66 * 10^8 CFU/mL

Explanation:

Given -

a) Number of colonies of bacteria is equal to 66

b) Total volume of the solution is equal to 0.1 mL

c) Dilution factor is equal to 10^{-7}

As we know that

CFU/mL = \frac{N * DF}{V}

Where N is the number of bacterial colonies, DF is the dilution factor and V is the volume

Substituting the given values in above equation, we get -

CFU/mL = \frac{66* 10^7}{0.1} \\= 66*10^8

You might be interested in
A type of landscape in rainy regions where caverns ,sinkholes,and deep valleys are common called​
Pachacha [2.7K]

Answer:

Karst topography

hope this helped~ <3

-Dream

8 0
2 years ago
4: Units of inheritance known as genes exist in pairs.
Bas_tet [7]

Answer:

4. a

5. a

6. a

7. a

8. a

9. a

10. True

Explanation:

4. Units of inheritance in living organisms are known as genes. These genes exist in pairs in all organisms and a copy of each gene is passed down to the offspring during reproduction.

Correct option: a

5. Assuming the dominance of allele A over allele a:

                AA    x    aa

          Aa    Aa    Aa    Aa

All the offspring will appear tall since the effects of allele a is masked by allele A.

Correct option: a

6. From the cross in (5) above, the genotypic ratio of the offspring is 100% Aa.

Correct option: a

7. Alternate forms of genes in living organisms are known as alleles. A copy of the alleles is usually passed down to the offspring during the process of reproduction.

Correct option: a

8. Phenotypes are the physical appearance of organisms. They are physical interpretation of genes.

Correct option: a

9. The law of segregation was postulated by Gregor Mendel. It states that gene pairs segregate during the process of meiosis and then randomly unite during the process of fertilization.

Correct option: a

10 Heterozygous organisms have two different alleles for the same genes. For genes that obey Mendelian laws, heterozygous condition is characterized by one dominant and one recessive alleles.

7 0
3 years ago
3. Describe how the nervous system helps different parts of your body communicate with one another the moment you begin to pet a
Brilliant_brown [7]

Answer:

When petting a dog, mechanoreceptors in the skin of your hand send signals to the sensory neuron. The sensory neuron connects to your spinal cord and through your brain.

Explanation:

5 0
1 year ago
Differentiate between fraud and abuse, making sure to provide an example of each. does one occur more frequently in the medical
Stolb23 [73]

 I think it would be hard to get this one right


3 0
3 years ago
An unknown disease or a well-known disease that suddenly becomes harder to control is called
adell [148]
D. a viral disease because it is known and unknown and spreads.
8 0
2 years ago
Other questions:
  • A cell divides to produce two daughter cells that are genetically identical. ____ 13. Homologous chromosomes synapse and crossin
    6·1 answer
  • A medical specialty that is particularly concerned with malignant tumors and their treatment is called:
    6·2 answers
  • what is the most important responsibility of individual in creating a safe environment especially on public health. ​
    6·1 answer
  • Which is an example of how latent evidence can be used to solve a crime?
    7·2 answers
  • Why does the human population continue to grow exponentially answers?
    6·2 answers
  • Does natural selection occur when which of the following conditions are met?
    6·1 answer
  • Which of these conditions is least likely to cause a species to become extinct due to environmental changes?
    13·1 answer
  • Senescence __________. Question 5 options: a) begins at the moment of conception and accelerates after age 40 b) occurs across a
    7·1 answer
  • This is an example of a frameshift mutation.
    9·1 answer
  • HELP!
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!