Lactobacillus

Q.

Which one of the following population interactions is widely used in medical science for the production of antibiotics?

1. Mutualism

2. Amensalism

3. Commensalism

4. Parasitism

Q.

Which fruit has lactic acid?

Q.

___ bacteria is responsible for converting milk into curd.

Q. The breakdown of sugars of milk, lactose to lactic acid is called coagulation.

1. True
2. False

Q.

What is the difference between eubacteria and bacteria....is it just a difference of spelling or a difference in characters too?

Q. Which microorganism is used in the wine industry to produce ethanol from glucose. What type of conditions are required for the process?

1. Saccharomyces cerevisiae; Process: Anaerobic conditions
2. Penicillium notatum; Process: Aerobic conditions
3. Saccharomyces cerevisiae; Process: Aerobic conditions
4. Penicillium notatum; Process: Anaerobic condition

Q. What is meant by gram stain

Q. With the help of a flowchart, distinguish the types of bacteria on the basis of nutrition.

Q. Gram staining technique is based on the fact that Gram-positive bacteria retain _______ stain that Gram-negative bacteria do not.

1. Acetone
2. Phenol
3. Safranin
4. Crystal violet

Q. The process of fermentation of milk starts when small amount of curd is added to it.

1. True
2. False

Q. Why is it difficult to classify bacteria? Give two reasons

Q. Lactic acid destroys harmful microbes in the milk.

1. True
2. False

Q.

How does the Kjeldahl Method Work?

Q.

State the role of bacteria in tea production.

Q. The bacteria which helps in the convertion of milk into curd is

1. Lactobacillus
2. Clostridium
3. Rhizobium
4. All of the above

Q. What is gram stain?

Q. Identify the following microbe with the characteristics given.
1. It is an anaerobe.
2. It is found in dairy products.

1. Saccharomyces
2. Lactobacillus
3. Rhizobium
4. Penicillium

Q. The process of seperation of milk protiens from other constituents of milk is termed as:

1. Centrifugation
2. Fixation
3. Fermentation
4. Coagulation

Q. Choose the correct answers from the alternatives given.
When bacteria are rod-shaped, they are called

1. cocci
2. bacilli
3. vibrio
4. spirilla

Q. Curd or yoghurt is prepared by the milk.

1. boiling
2. cooling
3. fermenting
4. drying

Q. Sulphonamides were used to treat microbial infection because they inhibit microbial growth by

1. Inhibiting wall formation
2. Competing with PABA required for synthesis of folic acid
3. Breaking naked DNA of microbes
4. Inhibiting union of ribosome subunits and preventing protein synthesis

Q.

Where Can Microbes Live?

Q. Which of the following are the uses of Lactobacillus?

1. Production of curd, cheese, cocoa
2. To treat abdominal discomfort
3. Production of leavened fodder
4. Provides rigidity to jute bags

Q. Rita observed slide of buttermilk. Which of the following shape shaped bacteria is observed?

1. None of the above
2. Comma shaped
3. Rod shaped
4. Spiral shaped

Q. With the help of a flowchart, distinguish the types of bacteria on the basis of nutrition.

Q. Pair the most appropriate terms.

1. Probiotic
2. S. erythraea
3. Erythromycin
4. Lentil
5. L. Casei
6. Legume

Q. All microbes are dangerous to humans and can cause serious illnesses.

1. True
2. False

Q. Ria was suffering from stomach pain, bloating and excessive gas. Her mother suggested her to have yoghurt. Why?

1. Yoghurt helps in digestion.
2. Yoghurt contains Lactobacillus, that kills harmful bacteria.
3. Yoghurt contains Clostridium, that kills harmful bacteria.
4. Yoghurt helps to improve our immunity.

Q. Which one of the following is an anaerobic bacterium?

1. Yeast
2. Penicillium
3. Lactobacillus
4. Paramecium

Q. Which among the following bacteria helps in killing harmful bacteria in the human body?

1. Streptococcus
2. Lactobacillus
3. Rhizobium
4. Staphylococcus