Problem 43 - Objective Biology for NEET

Question

How much is the size of viruses? (a) \(0.02-0.2 \mu \mathrm{m}\) (b) \(0.2-0.4 \mu \mathrm{m}\) (c) \(0.02-0.04 \mu \mathrm{m}\) (d) None

Step-by-Step Solution

Answer

The size of viruses is typically within the range \(0.02-0.2 \mu m\), so the correct answer is (a).

Step 1: Identify the Range

The first step in approach is to identify the common size range of viruses. The common range for the size of a virus is between \(0.02-0.2 \mu m\).

Step 2: Compare the Options

Now, check the options provided in the task and look for the option that falls within this range.

Step 3: Identify the Correct Range

Among the options given, option a) \(0.02-0.2 \mu m\) falls within the identified range. So, the correct answer is option a).

Key Concepts

Virology

Virology is the branch of science that deals with the study of viruses and viral diseases. Viruses are microscopic agents that can infect living organisms, including humans, animals, plants, and even bacteria. They are fascinating for several reasons:
- **Unique Structure**: Unlike cells, viruses do not have a cellular structure. They are composed of genetic material (DNA or RNA) surrounded by a protein coat, and sometimes an envelope of lipids. - **Replication**: Viruses must invade a host cell to replicate, as they lack the necessary cellular machinery. This makes them obligate intracellular parasites. - **Diversity**: There is a vast diversity of viruses, ranging from simple, tiny ones that infect single bacterial cells to complex viruses that can change the genetic makeup of higher organisms such as humans. Studying virology helps us understand how viruses function, how they spread, and how diseases can be prevented or treated. Vaccines, antiviral drugs, and effective diagnosis methods have all been developed because of advances in virology.

Microbiology

Microbiology is the study of microorganisms, which are organisms too small to be seen with the naked eye. These include bacteria, fungi, algae, protozoa, and viruses, although viruses are often considered separately because they are non-living outside a host. Understanding microbiology is crucial for several reasons: - **Ecosystem Significance**: Microorganisms play essential roles in ecosystems, such as decomposing organic matter and recycling nutrients. They also help in nitrogen fixation and carbon cycling. - **Health Impact**: While some microorganisms are beneficial (like gut bacteria), others are pathogenic and cause diseases. Studying these microorganisms assists in developing antibiotics and understanding disease mechanisms. - **Biotechnology Applications**: Microorganisms are used in biotechnology for brewing, genetic engineering, and producing antibiotics. They are vital in the development of new medical treatments and environmental conservation methods. Microbiology bridges biology and technology, providing tools and knowledge that enhance our understanding of life and improve human health. For example, knowing how viruses and bacteria interact is essential in tackling infectious diseases.

Virus Measurement

Measuring viruses is crucial to virology and microbiology. The size of viruses is typically measured in micrometers (µm) and varies across different types. Here’s how virus measurement is typically understood: - **Micrometers for Scale**: Most viruses range in size from 0.02 µm to 0.2 µm. These measurements are essential for understanding how viruses can spread and invade hosts. - **Electron Microscopy**: Due to their small size, viruses cannot be seen with regular light microscopes. Instead, electron microscopy is used to visualize viruses and measure their dimensions precisely. - **Size and Pathogenicity**: A virus's size can influence its ability to infect host cells. Smaller viruses might pass through the filters that capture larger particles and can affect virus transmission rates and mechanisms. Understanding virus size helps researchers in developing technologies to contain or destroy them and plays a significant role in creating filters and protective gear to prevent the spread of viral infections.