### Biotechnology - II Microbiology and Biostatistics Question Paper - 2010

**II Semester B.Sc. Examination, May/June 2010**

**(Semester Scheme)**

**BIOTECHNOLOGY- II Microbiology and Biostatistics**

Time:
3 Hours Max. Marks : 60

SECTION - A

**Instruction:**

*Part - I and Part - II must be answered in separate answer booklets*

__PART – I (Microbiology)__SECTION - A

Answer

**any 4**sub-questions.**Each**sub-question carries**2**marks.**(4x2=8****)**

1. Contributions of Leewenhock

2. Phenols

2. Phenols

3. Lambdaphage

4. Acid fast stain

4. Acid fast stain

5. Capsule

SECTION - B

Answer

**any 2**of the following questions.**Each**question carries**6**marks.**(2x6=12)**
6. Radiation methods of sterilization.

7. Construction and principles of SEM.

7. Construction and principles of SEM.

8. Photosynthetic apparatus in bacteria.

SECTION - C

Answer

**any****2**of the following questions.**Each**question carries**10**marks.**(2x10=20)**
9. Explain the characteristic features and reproduction of algae.

10. Describe the structure of gram positive and gram negative bacterial cell wall.12.

10. Describe the structure of gram positive and gram negative bacterial cell wall.12.

11. Explain TCA cycle.

12. Write short notes on:

a) Treatment of cholera

b) Transmission of HIV

c) Prevention of TB

d) Tetanus

12. Write short notes on:

a) Treatment of cholera

b) Transmission of HIV

c) Prevention of TB

d) Tetanus

**PART-II (Biostatistics)**
Answer

**any 4**sub-questions.**Each**sub-question carries**5**marks.**(4x5=20****)**

1. Find median and mode for the following data:

Income 100 150 180 200 230 250

No.of persons 24 26 16 20 6 30

2. A bag contains 3 red, 6 white and 7 blue coloured flowers. What is the probability that two flowers drawn are ?

a) white and blue

b) red

c) red and white or blue

Income 100 150 180 200 230 250

No.of persons 24 26 16 20 6 30

2. A bag contains 3 red, 6 white and 7 blue coloured flowers. What is the probability that two flowers drawn are ?

a) white and blue

b) red

c) red and white or blue

3. Calculate the mean and standard deviation for the following data:

Marks 0-5 5-10 10-15 15-20 20-25

No.of students 6 10 12 10 08

4. Find the missing frequency from the following data given that their A.M. is 7.3

x 2 6 7 8 9

f 4 6 12 9 8

Marks 0-5 5-10 10-15 15-20 20-25

No.of students 6 10 12 10 08

4. Find the missing frequency from the following data given that their A.M. is 7.3

x 2 6 7 8 9

f 4 6 12 9 8

5. Explain the following:

i) Type I and Type II errors.

ii) Power of a test and level of significance.

6. Six guinea pigs injected with 0.5 mg of a medication took on the average 15.4 seconds to fall asleep with an unbiased standard deviation 2.2 seconds with six other guinea pigs injected with 1.5 mg of the medication took on the average 11.2 seconds to fall asleep with an unbiased standard deviation of 2.6 seconds. Use the 5% level of significance to test the null hypothesis that the difference in dosage has no effect.

i) Type I and Type II errors.

ii) Power of a test and level of significance.

6. Six guinea pigs injected with 0.5 mg of a medication took on the average 15.4 seconds to fall asleep with an unbiased standard deviation 2.2 seconds with six other guinea pigs injected with 1.5 mg of the medication took on the average 11.2 seconds to fall asleep with an unbiased standard deviation of 2.6 seconds. Use the 5% level of significance to test the null hypothesis that the difference in dosage has no effect.

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