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
Artemon [7]
3 years ago
7

You have conducted an Ames test on a given compound. Which of the following would be classified as a positive result on the Ames

test?
(A) His+ strain grows on an his- plate.
(B) His- strain grows on an his+ plate.
(C) His+ strain grows on either an his- or an his+ plate.
(D) His- strain grows on an his- plate.
(E) His+ strain grows on an his+ plate
Biology
2 answers:
Step2247 [10]3 years ago
8 0

Answer:

The correct answer is option (D) "His- strain grows on an his- plate".

Explanation:

The Ames test is a procedure that allows to detect if a given compound can cause mutations on a tested organism by growing strains of bacteria that require histidine (His-) to growth, since they are not able to produce its own histidine. In the Ames test, the bacteria is exposed to a given compound and is grown in a medium with small amount of histidine (his- plate). If the His- strain grows on a his- plate, it means that the bacteria has mutated to synthesize its own histidine and it is considered as a positive result on a the Ames test.

g100num [7]3 years ago
8 0

Answer:

(D) His- strain grows on an his- plate.

You might be interested in
How are organisms classified into their different domains and kingdoms?
snow_tiger [21]
Its according to their organs.. where the my come from.. where they inhabit..what the eat.. how they look like..
take for example: reptiles.. they are classified as reptiles cause.. they are the only types of animals who have hard scaled skin not like fish..
5 0
3 years ago
Read 2 more answers
In the 1900s, many hydroelectric dams were built in order to hamess the energy of moving water. The dams supplied a clean source
Gala2k [10]

Answer:

fertile sediments in flood plains and deltas

Explanation:

8 0
3 years ago
In this project, you will analyze claims about the causes of inherited genetic variation. You will then make your own claim base
lawyer [7]

Answer:

Explanation:

In the 21st century, biotechnology has developed rapidly, and the era of great health has arrived. Cell therapy has opened up new ideas for the treatment of refractory diseases in human beings and has broad application prospects. Cell biology, molecular biology, and modern immunology are the three leading modern biological sciences. Cell therapy utilizes the characteristics of certain cells with specific functions. After bioengineering or in vitro amplification and special culture treatment, these cells have therapeutic effects such as enhancing immunity, killing pathogens and tumor cells, and promoting tissue regeneration, so as to achieve the purpose of treating diseases. Techniques such as cell culture proliferation and differentiation are among the most commonly used methods in cell biology research. Since the basic laws of cell behavior are the same in vitro culture and in vivo, many studies can be performed in vitro. More importantly, people can selectively and purposefully control the environment in which cells grow, so they can study the biological behavior of cells under certain special conditions.

Assay Development Service

Genetic/epigenetic analysis service

Epigenetics refers to the regulation of epigenetic gene expression by epigenetic changes (DNA methylation, histone modifications, and non-coding RNAs such as miRNAs) that are independent of genetic sequence changes and can be genetically apparent. DNA methylation, histone modifications, and miRNAs are a reflection of changes in environmental stimuli that interact to regulate gene expression and control cellular phenotype. Massively parallel sequencing technology lays the foundation for the construction of epigenomics. Creative Biolabs provides key sequencing-based methods used in the analysis of epigenomes, including bisulfite sequencing, chromatin immunoprecipitation sequencing, 3D chromatin capture, as well as the determination of open chromatin.

In vitro assay development service

In vitro or phenotypic assays are defined as those that model some aspect of disease biology in cells or tissues derived from an experimental species or humans, which have important clinical implications for disease progression and treatment. In vitro assays have the following benefits: obtaining direct knowledge related to the potential new disease background; multiple compounds with different modes of action can be tested, and depending on the throughput of the assay, within a certain range; it provides data support for more complex phenotypes or subsequent assessments or in vivo trials. The examples given in the various disease areas use a wide range of cell-based assay types, typically in 96-well formats, which differ markedly in their outcome when compared to, for example, biochemical or in vivo assays.

Assay Development Service

In vivo assay development service

The experimental animals themselves are studied for their breeding, biological characteristics and information, new varieties cultivation and disease diagnosis, treatment, and prevention to achieve people's purposes. Taking animals as a model, some experiments are carried out in vivo to study the reactions, manifestations and developmental rules of animals, and lay the foundation for solving complex diseases of human beings. The services of in vivo assay include assessing the phenotypic characteristics of transgenic lines, functional MRI services for awakening animals to visualize neural networks, and assessing transporter activity and building animal models, etc.

7 0
3 years ago
How would soap affect the surface tension of water?
sergiy2304 [10]
It breaks apart the hydrogen bonds
4 0
3 years ago
What moves to opposite poles in Anaphase 1
Katarina [22]

✧・゚: *✧・゚:*    *:・゚✧*:・゚✧

                  Hello!

✧・゚: *✧・゚:*    *:・゚✧*:・゚✧

❖ The homologous chromosomes (sister chromatids) move to opposite poles of the cell. The sister chromatids are pulled to opposite poles by spindle fibers.

~ ʜᴏᴘᴇ ᴛʜɪꜱ ʜᴇʟᴘꜱ! :) ♡

~ ᴄʟᴏᴜᴛᴀɴꜱᴡᴇʀꜱ

5 0
3 years ago
Other questions:
  • On a hot, sunny day, which surface would MOST LIKELY be the hottest to walk on in your bare feet?
    5·2 answers
  • What is a scientific concept
    12·1 answer
  • Evidence of evolution 1. make drawings to explain the difference between homologous and analogous structures. 2. define vestigia
    15·1 answer
  • Wearing at joints at certain points on the skeleton can give you clues about the person's: A. Height B. Weight C. Gender D. Age
    10·1 answer
  • Four positively changed particles are at various distances from a changed plate. The particles are equally changed and do not in
    10·1 answer
  • Name five elements named after countries
    14·2 answers
  • If an mRNA strand is 6399 nucleotides long how many amino acids are coded for ( Numeric answer)
    8·1 answer
  • A client has been diagnosed with osteomyelitis and admitted to the hospital. the client's fever persists throughout most of the
    7·1 answer
  • Which of the following statements about daughter cells are true? (Select all that apply.)
    9·1 answer
  • How is gene theory related to the theory of evolution?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!