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umka21 [38]
3 years ago
13

. When biomedical researchers design drugs that must enter cells to be effective, they sometimes add different groups to make th

e drug molecules more likely to pass through plasma membranes. What kind of chemical group would you choose to add to your drug? 2. Responding to their environment, plants alter the permeability of their phospholipid bilayer by incorporating different percentage of different components. Cold temperatures would decrease the permeability of the plant’s membrane. How should it respond?
Biology
1 answer:
MrRa [10]3 years ago
3 0

Answer:

1. Non-polar group

2. Increase cholesterol in the phospholipid bilayer

Explanation:

1. The plasma membrane of cells is made up of two layers of phospholipids, this is to insure that there is a distinct separation in the contents of the inside of the cell, from the outside. Water (a polar molecule) cannot easily pass through the membrane, hence a non-polar molecule would pass through easier.

2. Cholesterol in the plasma membrane increases fluidity, hence if the plasma membrane's permeability is decreasing due to the cold temperature, increasing fluidity and permeability would then allow the membrane to retain its function.

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Answer: The fossil is 11459 years old.

Explanation:

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First we have to calculate the rate constant, we use the formula :

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Now we have to calculate the age of the sample:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

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k = rate constant  = 1.21\times 10^{-4}\text{years}^{-1}
t = age of sample  = ?
a = let initial amount of the reactant  = 100 g
x = amount decayed = 75 g
a - x = amount left after decay process  = 100 - 75 = 25 g  Now put all the given values in above equation, we get
[tex]t==\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}

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The fossil is 11459 years old.

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<u>ANSWER:</u>

The muscles and joints allow the hands to perform their function of holding and grasping a wide variety of things.

<u>EXPLANATION:</u>

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