Which of the following statements regarding antibody molecules is correct? an antibody molecule is composed of four polypeptide chains and is shaped somewhat like a fork. the "tines of the fork" (fab ends of the molecule) combine with the antigen. the "handle of the fork" (fc end of the molecule) determines the properties of the molecule, such as the ability to activate complement. all antibodies are secreted as groups (clusters) of five individual antibody molecules that are joined together to form large molecules called macroglobulins.

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]