Enzimasenzimas

1. What are the three fundamental statements of cell theory?
i.
ii.
iii.

2. The diagram below shows the characteristic rod-shaped structure of E. coli bacteria.

a. What isthe magnification of the image?

b. By which method (shown here) do bacteria
reproduce?

3. Complete this table of SI units of length:
 Unit | Abbreviation | Metric Equivalent |
 kilometer| km | 1 000 m | 103 m |
| m | 1 m | - |
centimeter | cm | | 10-2 m |
| mm | 0.001 m | 10-3 m |
micrometer | μm | 0.000 001 m | |
nanometer | nm | | 10-9 m |

4. What is themagnification of these images?

a. Scale bar 10µm measures 40mm on the image.

b. Scale bar 5µm measures 25mm on the image.

5. A micrograph has a scale bar of 2µm, which measures 40mm on the image.Measuring the
maximum length of the cell in the image, the ruler reads 180mm. How long is the cell?

6. What are the advantages of maximizing the surface area: volume ratio in a cell?

7. As thevolume of a cell increases, what happens to…? (increase/ decrease)

a. Production of waste products.

b. Usage of nutrients and oxygen.

c. The surface area: volume ratio.

8. “Unicellularorganisms carry out all the functions of life.”

a. Give one example of a unicellular organism.

b. What are 6 ‘functions of life’?

9. What is a stem cell?

10. Give three examples of specializedcells in multicellular organisms.

i.

ii.

iii.

11. Explain briefly how cell differentiation occurs. Refer to ‘genes’ in your answer.

12. This is an electronmicrograph of the bacteriumSalmonella typhi.

a. What is the maximum length of the main body of the cell?

b. What are the name and function of this structure?



13. In the space below, draw and label (with namesand functions), the structure of a
generalized prokaryote cell. Include cell wall, plasma membrane, pili, flagella, nucleoid
(naked DNA) and ribosomes.

14. In the table below,...