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3 years ago

In blue-white screening, what do blue colonies represent?

Biology

1 answer:

Basile [38]3 years ago

3 0

Answer:

The correct option is : cells containing empty plasmid vectors

Explanation:

The blue-white screen is a technique which involves the rapid identification of the recombinant bacteria in a vector-based molecular cloning experiment. In this method, a DNA ligated vector is inserted in a host cell which is viable for transformation and grown in presence of X-gal.

The cells that are transformed with the vectors having the recombinant DNA produce the white colonies. Whereas, the cells transformed with empty vector i.e. the non-recombinant plasmids, produce the blue colonies.

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Time Remaining 22 minutes 56 seconds00:22:56 Item 9 Time Remaining 22 minutes 56 seconds00:22:56 Production of a neurotoxin that

Radda [10]

Answer:

The correct answer is: Clostridium Tetani.

Explanation:

Clostridium tetani is a Gram-positive bacteria found in soil.

C. tetani may grow and generate tetanospasmin, a powerful toxin that interferes with motor neurons, producing tetanus, if introduced into a wound.

Tetanospasmin travels throughout the body via the lymphatic and bloodstream, where it is taken up by different sections of the nervous system. Tetanospasmin inhibits the release of the inhibitory neurotransmitters glycine and gamma-aminobutyric acid at motor nerve terminals in the nervous system. This blockage causes extensive motor neuron activation and muscular spasming. These muscle spasms usually start at the top of the body and work their way down, starting about 8 days after infection with lockjaw and progressing to spasms of the stomach muscles and extremities. The muscle spasms last several weeks.

Tetanus toxoid vaccinations, which are often given to children around the world, can inhibit the toxin's activity.

8 0

3 years ago

A teacher shows students a string of beads as a model of a chromosomes and genes. What do the beads represent? Explain

Elza [17]

Answer:

If the string of beads refer to a chromosome, then each bead is a gene responsible for one or more traits.

If the string of beads refer to a gene, then each bead refers to the sequence of nitrogenous bases in one strand of the gene.

Explanation:

A chromosome is composed of several genes.

A gene is composed of several nucleotides each containing a nitrogenous base. A gene is primarily made functional by the sequence of nitrogenous bases in its structure. If AGATTCA is a hypothetical sequence of the nitrogenous bases on one strand of a hypothetical gene then TCTAAGT will be the sequence of nitrogenous bases on the complementary strand of that particular gene.

3 0

3 years ago

Charged particles from the solar wind come closest to Earth at the equator, where Earth’s magnetic field lines dip down to the E

emmasim [6.3K]

Hi There!

Question - Charged particles from the solar wind come closest to Earth at the equator, where Earth’s magnetic field lines dip down to the Earth’s surface.

Answer - False

Why - Charged particles actually do the opposite of what it states in the question. Charged particles dip down to the Earths Surface and Earths magnetiv fields from the solar wind come closest to Earth.

Hope This Helps :)

3 0

4 years ago

Read 2 more answers

Please answer the following questions

krok68 [10]

Answer:

h and I am I the only one mad about this I waited a month for the folks in the back of my mind that I was like and I was like you were the only way to go with the kids to 3rd grade and I would have a nice time and a few more people to take cash behind and to get rid of the members of the group don't know how to get rid of the problem of a problem with a joke or another that you may not have seen as well I would love it to the future and to get rid of it as soon as I can come over to the house tomorrow morning and then I will be there for you and your wife

5 0

3 years ago

Which of the following terms means a species that evolved in a region and belongs there? Invasive species Indigenous species Non

AysviL [449]

I think it would be Indigenous Species. None of the others imply that in belongs in a certain area

3 0

3 years ago