Biology AP questions?

Question

Nucleosidases are
a) hormones that stimulate release of pancreatic enzymes
b) enzymes attached to the brush border that hydrolyze nucleosides
c) hydrolytic enzymes manufactured in inactive forms to protect the cells that produce them
d) protein-digesting enzymes that are activated by hydrochloric acid
e) enzymes that hydrolyze DNA.

The purpose of antidiarrhea medicine would most likely be to
a) speed up peristalsis in the small intestine
b) speed up peristalsis in the large intestine
c) kill E. coli in the intestine
d) increase water reabsorption in the large intestine
e) increase salt secretion into the feces

Thanks in advance.

Answer 1

For question #1, anything that ends in "ase" is an enzyme. So a nucleosidase would degrade a nucleoside.

For antidiarrhea, you don't want to increase peristalsis which will speed up feces moving through the intestinal tract which will cause more diarrhea. So, some medicines decrease peristalsis which slows the movement through the intestine and therefore has more water reabsorbed.

Answer 2

in #2 the function of the large intestine is to reabsorb water

choice D

I think #1 is Choice E because the nucleoside is the part of the DNA chain that contains the sugar -- deoxribose and the phosphate...an 'ase' is an enzyme which breaks things apart....hydrolyze DNA sounds reasonable

Answer 3

1) b
2) d