The lysosome is formed from
a. the cell nucleus.
b. the cell membrane.
c. the golgi apparatus.
d. the endoplasmic reticulum.

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a.passive diffusion b.facilitated diffusion c.active transport d.pinocytosis

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?