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Leya [2.2K]
2 years ago
15

Molecules that are too large to flow across the membrane need help from what structures?

Chemistry
2 answers:
Pachacha [2.7K]2 years ago
6 0
Some molecules, such as carbon dioxide and oxygen, can diffuse across the plasma membrane directly, but others need help to cross its hydrophobic core. In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.
Troyanec [42]2 years ago
5 0

Answer:

Some molecules, such as carbon dioxide and oxygen, can diffuse across the plasma membrane directly, but others need help to cross its hydrophobic core. In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as <u>channels</u> and <u>carriers</u>.

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An acid with a p K a of 8.0 is present in a solution with a pH of 6.0. What is the ratio of the protonated to the deprotonated f
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Explanation:

According to the Henderson-Hasselbalch equation,

                  pH = pK_{a} + \frac{log[A^{-}]}{[HA]}

Given values are pH = 6, pK_{a} = 8

Putting given values into the above equation as follows.

                   6 = 8 + \frac{log [A^{-}]}{[HA]}

                   \frac{log[A^{-}]}{[HA]} = -2

                   \frac{[A^{-}]}{[HA]} = antilog -2

                                         = 0.01

But according to the question, we need protonated to deprotonated ratio of \frac{[HA]}{[A^{-}]}

            \frac{[HA]}{[A^{-}]} = \frac{1}{0.01}

                     \frac{[HA]}{[A^{-}]} = 100

Thus, we can conclude that ratio of the protonated to the deprotonated form of the acid is \frac{100}{1}.

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