Page 31 - 84 human physiolofy part-1

Cell Physiology

• Quaternary The quaternary structure refers to the spatial relationship among the
polypeptide in the protein.

Enzymes

Enzymes are essential for life because most chemical reactions in living cells would occur too
slowly or would lead to different products without enzymes. A biological molecule that catalyzes a
chemical reaction. Most enzymes are proteins and the word "enzyme" is often used to mean a protein
enzyme. Some RNA molecules also have a catalytic activity, and to differentiate them from protein
enzymes, they are referred to as RNA enzymes or ribozymes.

Review Questions

1. List 2 functions of the cell membrane.

Questions 2 - 6 Match the following organelles with their function: 2. Mitochondria 3. Vacuoles 4.
Cilia 5. Smooth ER 6. Golgi Apparatus

A. Movement of the cell
B. Lipid synthesis and transport
C. "Powerhouse" of the cell, makes ATP
D. Storage areas, mainly found in plant cells
E. Packages and distributes cellular products

7. The diffusion of H2O across a semi permeable or selectively permeable membrane is termed

A. Active transport
B. Diffusion
C. Osmosis
D. Endocytosis

8. Oxygen enters a cell via?

a. Diffusion
b. Filtration
c. Osmosis
d. Active transport

9. The term used to describe, "cell eating" is?

a. Exocytosis
b. Phagocytosis
c. Pinocytosis
d. Diffusion

10. Which of the following requires energy?

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