Polylysine and polyglutamate are two examples of synthetic polypeptides that can assume an α‑helical structure under appropriate conditions. identify which two synthetic polypeptides can form an α‑helix at the indicated ph values. polyglutamate at ph 13ph 13 polyglutamate at ph 2ph 2 polylysine at ph 2ph 2 polyglutamate at ph 7ph 7 polylysine at ph 13ph 13 polylysine at ph 7

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.