Select all of the following that are characteristics of the plasma membrane. a. All living cells have an intact plasma membrane that separates the internal cellular components of the cell from its external environment.
b. The membrane is composed of phospholipids, large organic molecules with hydrophilic, fatty acid tails connected to a hydrophobic, phosphate head that serves a barrier blocking the movement of most molecules.
c. The selective permeability of a phospholipid bilayer membrane is also altered based on the presence of proteins embedded in the membrane.
d. The plasma membrane is able to regulate the movement of materials in and out of the cell because of its composition.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

[ answer ]

foliated

[ explanation ]

foliation forms in a rock when pressure squeezes the rock together. the rock then has a design of many different color little lines. there are three types of foliated rock. the types are slate, schist, and gneiss. each type of foliated rock is different based on grain size and foliation characteristics. the lines appear when the rock has been under pressure.

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