The correct answer is: A. The hydrophilic head groups of the lipid molecules are exposed to the outside of the cell and the cytoplasm, which is a water-like environment. The hydrophobic tails form an oily layer inside the membrane that keeps water out of the cell.

Plasma membrane of the cell is arranged in a bilayer of phospholipids. Phospholipids are amphipathic molecules which means that they have both hydrophilic and hydrophobic regions. The hydrophilic heads of phospholipids that are faced outward and hydrophobic layer located in the interior of the bilayer together make a good barrier between the interior and exterior of the cell, so the water and other polar or charged substances cannot easily cross the hydrophobic core of the membrane.

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2 years ago

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A student claims that the Y chromosome contains the sex-determining region gene, known as the SRY gene, which causes male fetuse

suter [353]

Answer: the SRY gene produces a protein that binds to specific regions of DNA in certain tissues, which affects the development of these tissues

Explanation: i got it right on my quiz

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