Structure and Function of Enzymes and Proteins

A phospholipid has a hydrophilic head and a hydrophobic tail, which causes it to form a bilayer structure when added to water, with the hydrophilic heads facing outwards and the hydrophobic tails facing inwards.

Steroids have a carbon skeleton containing four fused rings.

Cholesterol is a common component of animal cell membranes and a precursor from which other steroids are synthesized.

<p>Enzymes, most of which are proteins, are essential for life and enable many dynamic functions of living beings.</p> Signup and view all the answers

<p>Saturated fats and trans fats have negative effects on health by affecting cholesterol levels.</p> Signup and view all the answers

<p>Proteins make up more than 50% of the dry mass of most cells and are instrumental in nearly every dynamic function of living beings.</p> Signup and view all the answers

<p>The phospholipid bilayer forms a boundary between the cell and its external environment.</p> Signup and view all the answers

<p>Cholesterol is a precursor from which other steroids are synthesized.</p> Signup and view all the answers

<p>Phospholipids form a bilayer structure when added to water, with the hydrophilic heads facing outwards and the hydrophobic tails facing inwards.</p> Signup and view all the answers

<p>The phospholipid bilayer forms a boundary between the cell and its external environment, regulating the exchange of materials and maintaining cellular integrity.</p> Signup and view all the answers