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77julia77 [94]
3 years ago
14

Which of the following statements is true about the structure of the cell membrane?

Biology
1 answer:
miskamm [114]3 years ago
4 0

Answer:

The correct answer is:

The two layers of the plasma membrane are identical.

Explanation:

The plasma membrane is called a lipid bilayer because it is composed of two layers of cells and it makes the boundary of cell.

The other three statements are false because

Plasma membrane is semipermeable i.e it allows the transport of materials inside and outside the cell.

The proteins in the plasma membrane are integral proteins

The proteins in the plasma membrane are extensively folded and protruding from the membrane are in contact with inside and outside the cell.

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Which statement describes earthquakes?
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An earthquake is the result of a sudden release of stored energy in the earths crust that creates seismic waves.
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3 years ago
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
Can someone help me with my Flatworms and Roundwroms review sheet thank you
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8 0
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Answer:

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