Microbiology

Explanation

Viruses that infect bacteria are called bacteriophages, which disprove the statement that no virus can infect bacteria. Some viruses, like bacteriophages, can indeed change the cellular transcriptional activity in host cells, contradicting the statement that no virus can do so. Additionally, certain viruses known as marine viruses can survive in ocean waters, refuting the claim that no virus can survive in ocean waters.

Explanation

Some microorganisms, known as extremophiles, have adapted to survive and grow in extreme environments. They can thrive in conditions such as high temperatures above the boiling point of water, low temperatures below the freezing point of water, and highly acidic environments with a pH below 3. Therefore, statements 1 and 3 are correct, making option (b) Only two the correct choice.

Explanation

Biofilms are communities of microorganisms that can form on various surfaces, including medical implants within human tissues and food processing surfaces. These biofilms can exhibit antibiotic resistance, making them challenging to eradicate. Therefore, all three statements are correct as biofilms can form in these different environments and display antibiotic resistance.

Explanation

Adenoviruses possess double-stranded DNA genomes, while retroviruses contain single-stranded RNA genomes. Adenoviruses can lead to the common cold, while retroviruses such as HIV cause AIDS. Therefore, the correct statement is that only statement 2 is accurate.

Explanation

Bacteria and fungi can be cultured in artificial or synthetic mediums for laboratory studies and research purposes. This is because they are living organisms that can grow and multiply in controlled environments outside their natural habitats. Viruses, on the other hand, require a host cell to replicate and cannot be cultured in artificial mediums alone.

Explanation

In the context of artificial medium culture, bacteria and fungi are capable of being cultured. In contrast, viruses necessitate living cells for their replication. This means that only options 1 and 2, or (a), can be cultured in artificial/synthetic medium.

Explanation

In the field of Biology, the correct statement is that viruses do not have the enzymes required to produce energy. They cannot be grown in synthetic mediums as they rely on living cells for replication. Furthermore, viruses can be transmitted through various methods, not just by biological vectors.

Explanation

Certain microorganisms known as extremophiles have the capability to thrive in extreme environments such as freezing temperatures, highly acidic conditions, and high salt concentrations. This means that some microorganisms can indeed grow in 0°C temperature, highly acidic environments, and salt concentrations of 30%. Therefore, all three statements given in the question are correct, making option (d) - 1, 2, and 3 - the correct answer.

Explanation

All three kinds of organisms - bacteria, fungi, and flowering plants - are used as biopesticides.

Explanation

Bird flu, also known as Avian influenza, is caused by the H5N1 virus strain.

Explanation

Mad Cow Disease, also known as BSE, is caused by prions, which are infectious protein particles.

Explanation

Mad cow disease is triggered by prions, which are infectious proteins that do not contain nucleic acids.

Explanation

Viroids are composed of single-stranded RNA molecules and do not have a protein coat.

Explanation

Microorganisms such as bacteria, microalgae, and fungi play a significant role in various industries for processes like fermentation and the production of antibiotics and enzymes. They are extensively utilized in these sectors due to their versatility and effectiveness.