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satela [25.4K]
3 years ago
12

To transform bacteria with plasmids, technicians first make the bacteria competent (capable of taking up DNA) by placing them in

calcium chloride and chilling them. Plasmid is then added to the competent bacteria and the plasmid/bacteria combination is taken through a few more steps to make the bacteria take up DNA. In your experiment, should you treat a tube of bacteria that you do not add plasmid to exactly as you do the tube of bacteria that you will transform:
Biology
1 answer:
Fantom [35]3 years ago
5 0

Explanation:

The Plasmid is known as a genetic structures present in a cell that can be replicated independently of the chromosomes. Bacteria can take up from the foreign DNA in a process is known as the transformation.

This experiment helps to give control demonstrating that the arc (antibiotic-resistance colonies) which occurs on the plate is known as a result of the Plasmid which is taken up by the cells. If there is no Plasmid, then there should be no growth present on the antibiotic plates.

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Which would scientists predict might happen due to solar flares?
Igoryamba

Answer:

b. radio navigation systems and global positioning systems will be inaccurate

Explanation:

I just took this test

6 0
2 years ago
To assess Mendel’s law of segregation using tomatoes, a true-breeding tall variety (SS) is crossed with a true-breeding short va
lapo4ka [179]

Answer:

0.949367 ≈ 0.95.

Explanation:

The chi square analysis can be done by the formula as follows:

Chi square = (O-E)²/E

Here, O is observed value and E is expected value.

The tall trait follows the Mendel's law, this means the cross between F1 results in the formation of progeny with ratio 3( tall) : 1 (short).

The observed values for set I is  63 tall, 16 short.

The expected value for tall plant =  \frac{3}{4}\times79 = 59.25 .

The expected value for short plant = \frac{1}{4}\times79 = 19.75.

Put these value in the formula for chi square analysis:

For tall plants = ( 63 - 59.25)²/ 59.25= 0.237.

For short plants = (16 - 19.75)²/ 19.75 = 0.712

Total value for set I = 0.237 + 0.712 = 0.95.

Thus, the answer is 0.95.

6 0
3 years ago
Which of the following sentences from the article helps prove the claim that living with farm animals can help prevent asthma?
Brums [2.3K]

Answer:

D

Explanation:

Not sure but the sentence is super understamdable

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What tends to happen to the populations in the developing countries over time as the countries become more developed? *
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Answer:

2

Explanation:

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What information is contained in the branches of a cladogram?
Brums [2.3K]

The branching point on a cladogram represents a common ancestor. A cladogram is a diagram used in cladistics to show relations among organisms. However it is not an evolutionary tree since it does not show how ancestors are related to descendants, nor does it show how much they have changed. 
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