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nexus9112 [7]
3 years ago
6

What are the three stages of urine formation?

Biology
1 answer:
love history [14]3 years ago
5 0
Filtration, Reabsorption, Secretion: The Three Steps of Urine Formation. The kidneys filter unwanted substances from the blood and produce urine to excrete them. There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion.

Hope this helps :)
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6. (3 pts) After transformation, 40 colonies were present on the plate. What is the transformation efficiency of the competent c
natali 33 [55]

Answer:

Given:

Number of colonies on plate = 40

Amount of DNA used for transformation = 100ng

Volume of competent cells used = 100ul

Total volume = 1ml (1000ul)

Volume plated for growth = 200ul

The amount of cells transformed per 1 µg of DNA is called the transformation efficiency

(CFU is colony forming units) => (number of colonies on plate/ng of DNA plated) X 1000 ng/µg = CFU/µg of DNA

Amount of DNA used for plating = 100ng * (200/1000)

                                                      = 100ng * (1/5)

                                                      = 100/5 = 20ng

Efficiency calculation = 40 colonies / 20ng = 2 colonies/ng

               (2 colonies/ng) * (1000 ng/µg) = 2000 CFU/ug DNA

Transformation efficiency = 2000 Transformants / ug DNA

                                          = 2 x 10³ Transformants / ug DNA

Explanation:

Efficiency of transformation is highest in the 100 pg-1 ng range, so Low transformation efficiency could be because of high amount of DNA used for transformation.

6 0
3 years ago
Who was Louis Pasteur?
olya-2409 [2.1K]

Answer:

Louis Pasteur was a French chemist and microbiologist renowned for his discoveries of the principles of vaccination, microbial fermentation, and pasteurization.

mark me brainliestt :))))

8 0
2 years ago
Each gene controls the production of one or more specific
Oduvanchick [21]
True. Have a good daub
6 0
3 years ago
Complete the sentences. Each term may be used more than once.
11Alexandr11 [23.1K]

Answer:

The correct answer is -

1. right-handed

2. right-handed

3. positive

4. left-handed

5. negative

6. negative

Explanation:

In a circular bacterial chromosome, the structure of DNA is a right-handed double helix In a circular bacterial chromosome.

If DNA is twisted in the right-handed direction, it becomes overwound. Overwinding results in positive supercoiling takes place. If DNA is twisted in the left handd direction, it becomes underwound. Underwinding results in negative supercoiling.

f. One effect  negative supercoiling in bacterial chromosomes is to promote separation of the two strands of DNA in the double helix

8 0
3 years ago
4 The state of matter with a fixed
Brut [27]

Answer:

It's option A- Solid

Explanation:

Solids have definite shape and volume.

3 0
3 years ago
Read 2 more answers
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