Johnny, a Living Environment student, has a homework assignment where he must come up with an real-world analogy for the cell wall. Johnny decides that he will compare the cell wall to a doorman because a doorman only allows certain people into a building, just like a cell wall only lets certain materials into the cell. What error did Johnny make in his analogy? A. Instead of cell wall, he should have said cell membrane because it is selectively permeable.
B. Instead of cell wall, he should have said the nucleus because the nucleus decides what enters and exits the cell.
C. His analogy between the doorman and the cell wall was correct, but the cell wall doesn't allow any materials pass through into the cell.
D. Johnny did not make an error.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.