What is true: In a phospholipid bilayer, the:?

Question

1) phosphate groups are hydrophobic
2) fatty acid tails are ionized
3) fatty acid tails are hydophilic
4) proteins are located only between the two layers
5) phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm

Thanks!

Answer 1

5) phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm

The heads are hydrophilic, having a strong affinity for water, so they face the exterior.

Answer 2

The answer is No. 5 I'm sure.you know why?as
for No.1 it's wrong as the PO4-3 groups are hydrophilic due to the -ve charge on them.
for No. 2&3 the fatty acids are very hydrophobic & they are not ionized.
for No. 4 proteins are not only located bet. the 2 layers as they are also located in each layer of the 2 to make openings in the membrane to allow exchange of certain substances.that's what is called the protein channels.
for No. 5 & because of the polarity of the phosphate groups , the are directed towards the exterior & the interior of the cell as both inside & outside the cell is hydrophilic so the cell membreane can interact with the surrounding of the cell.

Answer 3

The answer is 5.

Answer 4

5.

Answer 5

5 is true