A. Arginine will make the charge of the polypeptide more positive.
From the picture i would say maybe a. but i cant really tell from the low quality of the pic
B. Stalagmites forms directly below a stalactite. If you go inside a cave, you will notice some spikes that points down: these are the stalactites. The rest that forms right below these rocks are the stalagmites - which are also spiked.