Acommon structure feature of membrane lipids is their amphipathic nature. for example, in phosphotidylcholine, the two fatty acid chains are hydrophobic and the phosphocholine head group is hydrophilic. draw the structure of the following membrane lipids and show their hydrophobic and hydrophilic groups: a. phosphotidylethanolamine with fatty acids at c1 being stearic acid and c2 linoleic acid b. sphingomyelin with the fatty acid oleic acid c. glucosylcerebroside with the fatty acid being myristic acid d. cholesterol

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Find the kinematic pressure of 160kpa. for air, r-287 j/ kg k. and hair al viscosity of air at a temperature of 50°c and an absolute (10 points) (b) find the dynamic viscosity of air at 110 °c. sutherland constant for air is 111k