Which statement is true about the proteins found in different organisms?

the proteins of different organisms are different, but they are all made of the same set of 20 different parts.

the same proteins are found in all different organisms.

all animals have the same proteins and all plants have the same proteins, but animal proteins are different from plant proteins.

proteins are made of 20 different parts, but only 10 parts are found in animals while the other 10 are found in plants.

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid

How do you know when a chemical reaction has occurred