The enzyme used to release DNA from bacterial cell is :

Methanogens do not produce:

The region where the body of the ovule fuses with funicle is known as:

Read the given passage carefully and answer the questions
Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. Sustained high fever (39° to 40°C), weakness, stomach pain, constipation, headache and loss of appetite are some of the common symptoms of this disease. Typhoid fever could be confirmed by Widal test. Plasmodium enters the human body as sporozoites. The parasites initially multiply within the liver cells and then attack the red blood cells (RBCs) resulting in their rupture. The rupture of RBCs is associated with release of a toxic substance, haemozoin, which is responsible for the chill and high fever recurring every three to four days. There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa-associated lymphoid tissue (MALT). In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant. Cannabinoids are a group of chemicals, which interact with cannabinoid receptors present principally in the brain. Generally taken by inhalation and oral ingestion, these are known for their effects on cardiovascular system of the body.
Which one of the following structures constitute about 50 percent of the lymphoid tissue in the human body?

Microbes in human welfare Microbes are a very important component of life on earth. we use microbes and microbially derived products almost every day, like LAB to make curd, yeast to make bread, adding flavor and texture to cheese, producing antibiotics etc. The addition of LAB, improves the milk quality by increasing vit. B12. Cheese is one of the oldest food items in which microbes are used. For example, large holes in Swiss cheese are due to CO2 produced by the bacterium Propionibacterium sharmanii. The BOD test measures the rate of uptake of oxygen by microorganisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water. The greater the BOD of waste water, the more is its polluting potential. In anaerobic sludge digesters, bacteria produce a mixture of gases like methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as a source of energy. Biofertilisers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilisers are bacteria, fungi and cyanobacteria. You have studied about the nodules on the roots of leguminous plants formed by the symbiotic association of Rhizobium. These bacteria fix atmospheric nitrogen into organic forms, which is used by the plant as a nutrient. Other bacteria can fix atmospheric nitrogen while free-living in the soil (examples Azospirillum and Azotobacter).
The large holes in Swiss cheese are generated by-

Which one of the following expressions is used for comparing productivity of different ecosystems?

Which of the following is NOT a cause of biodiversity loss due to human activities?

The speed of the electron in \(n = 3\) orbit of \(He^+\) ion would be: (Given \(k = 9 × 10^9 \text{ N}⋅­m^2C^{-2}, e = 1.6 × 10^{-19} \text{ C}, h = 6.63 × 10^{-34} \text{ Js}\))

The magnetic field strength in silicon is 1000 A/m. If its magnetic susceptibility is \( -0.3 \times 10^{-5} \), then the intensity of magnetization will be:

For the given 5 values \(24,18,33,42,24\); the \(3\) -year moving averages are:

When a positive charge (+ q) is brought near one face of a metal cube, the

Identify the correct statements about the internal resistance of a cell:
(A) It depends on the nature of the electrolyte
(B) It increases with the increase in temperature of the electrolyte
(C) It increases with the decrease in temperature of the electrolyte
(D) It increases with the distance between the two electrodes
Choose the correct answer from the options given below:

For a chemical reaction with a rise in temperature by \(10^{\circ} C\), the rate constant becomes nearly