11. the highest level in the organizational hierarchy of the human body is the
a. atom.
b. organ system.
c. organism.
d. tissue.
12. the brain of the cell is called the
a. endoplasmic reticulum.
b. nucleus.
c. lysosome.
d. cytoplasm.
13. within the cell, the clean-up crew is the
a. endoplasmic reticulum.
b. nucleus.
c. lysosomes.
d. cytoplasm.
14. within the cell, a tubular network that is involved in protein synthesis and transport is the
a. endoplasmic reticulum.
b. nucleus.
c. lysosomes.
d. cytoplasm.

11. The correct answer is option C, that is, organism. The joining of atoms forms molecules, the molecules further form organelles, and the organelles are the component of the cells that combine to produce tissue, the tissues further forms a system of organs, and the eventually all of these in combination produce an organism.  

12. The correct answer is option B, that is, nucleus. The genetic information is aligned within the cell in the nucleus. It is considered as the brain of the cell as it is accountable for the majority of the functions of the cell.  

13. The correct answer is option C, that is, lysosomes. Lysosomes refer to the organelles within the cell that comprises hydrolytic enzymes. These enzymes possess the tendencies to dissociate biomolecules like lipids, proteins, nucleic acid, and carbohydrates.  

14. The correct answer is option A, that is, endoplasmic reticulum. It is the network of tubes, which takes part in the synthesis of proteins and their transportation.