Question

12) What limits the resolving power of a light microscope?

A) The type of lens used to magnify the object under study.

B) The shortest wavelength of light used to illuminate the specimen.

C) The type of lens that focuses a beam of electrons through the specimen.

D) The type of heavy metal or dye that is used to stain the specimen.

13) The advantage of light microscopy over electron microscopy is that

A) Light microscopy provides for higher magnification than electron microscopy.

B) Light Microscopy Provide for higher resolving power than electron microscopy.

C) Light Microscopy allows one to view dynamic processes in the living cell.

D) Both A and B.

E) Both B and C.

Decimals Metric system and scientific nomenclature

1. Rewrite 0.823489 so that it has 3 significant figures.

2. Write the number 0.000074320 in scientific notation.

3. Write the number 6,230,005 in scientific notation.

4. Convert 227 µg into mg. (your answer must be in scientific notation).

5. What fraction of a meter is an nm? (Your answer must be in scientific notation).

6. Convert 15 cL into µL.

(Your answer must be in scientific notation).

7. Convert 2.7 x10^-7 ng. (Your answer must be in scientific notation).

8. The number 0.0748530 has how many significant figures?

Statistics

Use the data set below to answer questions 9-11 below.

21.2 mg/mL   24.6 mg/mL   15.0 mg/mL   21.2 mg/mL   11.3 mg/mL   10.6 mg/mL

9. What is the median con concentration?

10. What concentration is the mode?

11. Which concentration is the mean?

12. What type of correlation is this: As studying decreases, exam scores decrease. (Explain)

Answer 1

12) What limits the resolving power of a light microscope?

B) The shortest wavelength of light used to illuminate the specimen

13) The advantage of light microscopy over electron microscopy is that:

C) Light microscopy allows one to view dynamic processes in living cells.

1) 8.23 X 10^-1

2) 7.43 X 10^-5

3) 6.23 X 10⁶

4) 227 microgram = .227 milligram (2.27 X 10¹)

5) 1 meter = 1 X 10⁹ nanometre, so it is 0.000000001 nm.

6) 15 cL = 150000 µL (1.5 X 10⁵)

7) 2.7 x10^-7 ng = 2.7 X 10^-16

8) The number 0.0748530 has 1 significant figure that is 7.

10.6 mg/mL 11.3 mg/mL 15.0 mg/mL 21.2 mg/mL 21.2 mg/mL 24.6 mg/mL

9) The median con concentration is 15 + 21.2 / 2 = 18.1

10) The mode concentration is 21.2 mg/mL

11) The mean concentration is 10.6 mg/mL + 11.3 mg/mL + 15.0 mg/mL + 21.2 mg/mL + 21.2 mg/mL + 24.6 mg/mL / 6 = 17.31 mg/mL

As studying decreases, exam scores decrease: positive correlation. This is the positive correlation. When one variable decreases as the other decreases the correlation is positive.