which of the following is not a type of virus course

How are viruses classified based on the type of host?

Which of the following is not a type of computer virus? Polymorphic virus; Space filler virus; Multipartite virus; Trojan; Boot sector virus; Answer: (4) Trojan. Q 2. Which of these was the first computer virus? Creeper; Brain; Worm; Crypto Locker; Morris Worm; Answer: (1) Creeper

What are the different types of computer viruses?

Sep 21, 2021 · Influenza (Flu) Viruses. There are two main types of human flu viruses: types A and B. The flu A and B viruses that routinely spread in people are responsible for seasonal flu epidemics each year. Flu A viruses can be broken down into sub-types depending on the genes that make up the surface proteins. Over the course of a flu season, different ...

What are viruses?

Which of the following processes can viruses carry out? A) They can manufacture their own ATP, proteins, and nucleic acids. B) They can use the host cell to copy themselves and make viral proteins. C) They can use the host cell to copy themselves and then synthesize their own proteins inside the viral capsid.

Why do some viruses require a type of replication that humans don't?

Mar 02, 2021 · Sol: (a) Megavirus chilensis. 6. Which of the following statements are true about the capsomeres? (a) It is an individual unit of the capsid. (b) It is a viral protein for replication. (c) It is a unit of nucleic acid in viruses. (d) All of the above.

Which of the following is not a type of virus *?

What are 5 classes of viruses?

What are the four classes of virus?

How many virus classes are there?

What are the 6 classes of viruses?

What are the 3 types of viruses?

What are the classes of viruses?

What are the types of virus?

What are viruses Class 9?

Which feature is not found in viruses?

What are the types of viruses microbiology?

Q 1. What is the definition of a computer virus?

Ans. A computer virus is a kind of malicious computer program, which when executed, replicates itself and inserts its own code, which spreads a har...

Q 2. What are the main computer viruses?

Ans. The main types of computer virus are as follows: Boot Sector Virus Direct Action Virus Multipartite Virus Polymorphic Virus Resident Virus Fil...

Q 3. What is the Creeper Virus?

Ans. Creeper virus was the first-ever computer virus that was released in the year 1971. Its creator was Bob Thomas.

Q 4. What are the examples of a computer virus?

Ans. Given below are a few examples of a computer virus: Storm Worm CryptoLocker Slammer Creeper Netsky

Q 5. How to secure a computer system from a virus attack?

Ans. A computer device can be secured from a virus attack by installing an anti-virus in the system.

What are the different types of viruses?

Various types of viruses: 1 File Virus:#N#This type of virus infects the system by appending itself to the end of a file. It changes the start of a program so that the control jumps to its code. After the execution of its code, the control returns back to the main program. Its execution is not even noticed. It is also called a Parasitic virus because it leaves no file intact but also leaves the host functional. 2 Boot sector Virus:#N#It infects the boot sector of the system, executing every time system is booted and before the operating system is loaded. It infects other bootable media like floppy disks. These are also known as memory viruses as they do not infect the file systems.

What type of virus infects the system by appending itself to the end of a file?

Various types of viruses: File Virus: This type of virus infects the system by appending itself to the end of a file. It changes the start of a program so that the control jumps to its code. After the execution of its code, the control returns back to the main program. Its execution is not even noticed.

What is a polymorphic virus?

Polymorphic Virus: A virus signature is a pattern that can identify a virus (a series of bytes that make up virus code). So in order to avoid detection by antivirus a polymorphic virus changes each time it is installed. The functionality of the virus remains the same but its signature is changed. Encrypted Virus:

What is a virus signature?

A virus signature is a pattern that can identify a virus (a series of bytes that make up virus code). So in order to avoid detection by antivirus a polymorphic virus changes each time it is installed. The functionality of the virus remains the same but its signature is changed. Encrypted Virus:

Why is it so hard to detect a virus?

It is a very tricky virus as it changes the code that can be used to detect it. Hence, the detection of viruses becomes very difficult. For example, it can change the read system call such that whenever the user asks to read a code modified by a virus, the original form of code is shown rather than infected code.

What is a memory virus?

It infects other bootable media like floppy disks. These are also known as memory viruses as they do not infect the file systems. Macro Virus: Unlike most viruses which are written in a low-level language (like C or assembly language), these are written in a high-level language like Visual Basic.

What are the two main types of influenza?

There are two main types of influenza (flu) virus: Types A and B . The influenza A and B viruses that routinely spread in people (human influenza viruses) are responsible for seasonal flu epidemics each year. Influenza A viruses can be broken down into sub-types depending on the genes that make up the surface proteins.

Where are influenza A viruses found?

Influenza A viruses also are found in many different animals, including ducks, chickens, pigs, whales, horses and seals. “Antigens” are molecular structures on the surface of viruses that are recognized by the immune system and are capable of triggering an immune response (antibody production).

What animals have influenza A?

Influenza A viruses also are found in many different animals, including ducks, chickens, pigs, whales, horses and seals. Antigenic Characterization of Influenza Viruses. “Antigens” are molecular structures on the surface of viruses that are recognized by the immune system and are capable of triggering an immune response (antibody production).

Do viruses make copies of themselves?

Viruses use the host cell's machinery to make copies of themselves. However, some human viruses require a type of replication that humans do not normally have. For example, humans normally do not have the ability to convert RNA into DNA.

What is the herpes virus?

D. The herpesviruses are important enveloped DNA viruses that cause disease in vertebrates and in some invertebrates such as oysters. Some of the human forms are herpes simplex virus (HSV) types I and II, causing facial and genital lesions, and the varicella zoster virus (VSV), causing chicken pox and shingles.

What is the yellow mottle virus?

Some viruses can be crystallized and their structures analyzed. One such virus is yellow mottle virus, which infects beans. This virus has a single-stranded RNA genome containing about 6,300 nucleotides. Its capsid is 25-30 nm in diameter and contains 180 identical capsomeres.

What is the virus that causes shingles?

Some of the human forms are herpes simplex virus (HSV) types I and II, causing facial and genital lesions, and the varicella zoster virus (VSV), causing chicken pox and shingles.

Can HSV reactivate?

The virus can later reactivate, replica te again, and infect others. In electron micrographs of HSV infection, it can be seen that the intact virus initially reacts with cell-surface proteoglycans, then with specific receptors. This is later followed by viral capsids docking with nuclear pores.

What is the RNA of poliovirus?

Poliovirus is an RNA virus of the picornavirus group, which uses its RNA as mRNA. At its 5′ end, the RNA genome has a viral protein (VPg) instead of a 5′ cap. This is followed by a non-translated leader sequence, and then a single long protein-coding region (~7,000 nucleotides), followed by a poly-A tail.

Do antibiotics kill viruses?

A) No; antibiotics work by inhibiting enzymes specific to bacteria. Antibiotics have no effect on eukaryotic or virally encoded enzymes. B) No; antibiotics do not kill viruses because viruses do not have DNA or RNA. C) Yes; antibiotics activate the immune system, and this decreases the severity of the infection.

What are the three types of viruses?

The Three Categories of Viruses. There are three different virus types that are made distinct by their shape. The cylindrical helical virus type is associated with the tobacco mosaic virus. Envelope viruses, such as influenza and HIV come covered in a protective lipid envelope.

How many different types of viruses are there?

There are five different types of viruses: Conjugate vaccines, inactivated vaccines, live, attenuated vaccines, subunit vaccines and toxoid vaccines. There are several ways people can slow the spread of a virus in lieu of drugs or vaccination.

What is the latest virus to threaten public health globally?

The latest virus to threaten public health globally is the coronavirus (COVID-19), which originated in Wuhan, China. Governments, global health organizations and the medical community have been working to raise awareness of the global outbreak and continue to warn individuals against traveling. As the death toll continues to rise, advanced practice nurses are working tirelessly to treat an increasing number of patients with COVID-19 and to assist scientists and researchers in learning more about the virus.

What are the characteristics of animal viruses?

The viruses within these categories share similar characteristics. They’re composed of RNA or DNA, and are coated with either a protein, lipid or glycoprotein. They’re also parasitic, meaning they can’t replicate without a host.

What are viruses made of?

The viruses within these categories share similar characteristics. They’re composed of RNA or DNA, and are coated with either a protein, lipid or glycoprotein. They’re also parasitic, meaning they can’t replicate without a host. Viruses are also the most abundant biological form of life on the planet.

Can viruses be cured?

They’re also parasitic, meaning they can’t replicate without a host. Viruses are also the most abundant biological form of life on the planet. While they can’t be cured, a vaccination can prevent their spread.

How does a virus spread?

How a Virus Spreads. The first thing a virion does is enter a cell and becomes a virus. Then it inserts genetic material into the host and takes over the cell’s operations. Next, it reproduces, creating viral protein and genetic material instead of the usual cellular products.

How long does it take for a virus to develop?

The incubation stage occurs right after exposure and before symptoms develop. This stage can range from hours for some infections to days, weeks, or even years for other infections. The next stage is prodromal, which involves mild, nonspecific symptoms.

How many stages of infection are there?

There are five stages of infection: incubation. prodromal. illness. decline. convalescence. This article will explain each of the five stages of infection in detail, describing how long they can last and giving examples of infections. It will also highlight what the stages of infection are, specifically in people with HIV. 1.

What is the definition of infection?

Decline. Convalescence. In HIV. Summary. Infection occurs when an organism, such as a virus or bacterium, invades the body. The infectious agent rapidly multiplies in the body’s tissues. Although not all infections result in disease, some can trigger the immune system, causing symptoms of illness.

What is the process of infection?

Infection occurs when an organism, such as a virus or bacterium, invades the body. The infectious agent rapidly multiplies in the body’s tissues. Although not all infections result in disease, some can trigger the immune system, causing symptoms of illness. There are five stages of infection: incubation. prodromal.

What is the incubation stage?

The incubation stage includes the time from exposure to an infectious agent until the onset of symptoms. Viral or bacterial particles replicate during the incubation stage.

What is the prodromal stage?

The prodromal stage refers to the period after incubation and before the characteristic symptoms of infection occur. People can also transmit infections during the prodromal stage. During this stage, the infectious agent continues replicating, which triggers the body’s immune response and mild, nonspecific symptoms.

How long does hepatitis B last?

Certain infections can last several weeks or even years. Symptoms of hepatitis B can last several weeks#N#Trusted Source#N#. It can also develop into a chronic disease if the infection continues for more than 6 months.

Do viruses need a host cell?

Unlike bacteria, many of which can be grown on an artificial nutrient medium, viruses require a living host cell for replication. Infected host cells (eukaryotic or prokaryotic) can be cultured and grown, and then the growth medium can be harvested as a source of virus.

Can viruses be grown in vivo?

Viruses can be grown in vivo (within a whole living organism, plant, or animal) or in vitro (outside a living organism in cells in an artificial environment. Flat horizontal cell culture flasks (see Figure 6.17 (a)) are a common vessel used for in vitro work.

What filters are used to detect TMV?

At the beginning of this chapter, we described how porcelain Chamberland filters with pores small enough to allow viruses to pass through were used to discover TMV. Today, porcelain filters have been replaced with membrane filters and other devices used to isolate and identify viruses.

What is contact inhibition?

This is called contact inhibition and it prevents the density of the cells from becoming too high. To prevent contact inhibition, cells from the primary cell culture must be transferred to another vessel with fresh growth medium. This is called a secondary cell culture.

What is HeLa cell?

HeLa cells were the first continuous tissue-culture cell line and were used to establish tissue culture as an important technology for research in cell biology, virology, and medicine. Prior to the discovery of HeLa cells, scientists were not able to establish tissue cultures with any reliability or stability.

What was Henrietta Lacks' cancer?

In January 1951, Henrietta Lacks, a 30-year-old African American woman from Baltimore, was diagnosed with cervical cancer at Johns Hopkins Hospital. We now know her cancer was caused by the human papillomavirus (HPV).

What is serological assay?

A serological assay is used to detect the presence of certain types of viruses in patient serum. Serum is the straw-colored liquid fraction of blood plasma from which clotting factors have been removed. Serum can be used in a direct assay called a hemagglutination assay to detect specific types of viruses in the patient’s sample. Hemagglutination is the agglutination (clumping) together of erythrocytes (red blood cells). Many viruses produce surface proteins or spikes called hemagglutinins that can bind to receptors on the membranes of erythrocytes and cause the cells to agglutinate. Hemagglutination is observable without using the microscope, but this method does not always differentiate between infectious and noninfectious viral particles, since both can agglutinate erythrocytes.

Why are viruses dependent on their host?

Ans. D. Explanation: Viruses do not contain ribosomes, so they cannot make proteins. That is why they are dependent on their host. Viruses have different shapes, sizes and can be categorised by their shapes. Coronavirus: Origin, Symptoms, Types and Infected countries.

What is a virus made of?

A. Explanation: A virus that is made up of a DNA or RNA genome inside a protein shell is known as a capsid. Some viruses have an external membrane envelope. These are a few questions related to viruses, types, structure, classification, etc. 15 Unknown facts about Viruses.

Can viruses be fatal?

Viruses can infect animals, plants, fungi, and bacteria. The virus sometimes can cause a disease that may be fatal. Some virus may also have one effect on one type of organism, but a different effect on another. Viruses cannot replicate without a host so they are classified as parasitic.

What is a GK quiz?

GK Quiz on Viruses, types, treatments. Viruses can infect animals, plants, fungi, and bacteria. The virus sometimes can cause a disease that may be fatal. Some virus may also have one effect on one type of organism, but a different effect on another.