"Potato mosaic" disease is caused by :-
Potatoes may be infected with many different viruses that can reduce tuber quality and yield. Mosaic virus of potatoes is one such disease that actually has multiple strains. Potato mosaic virus is divided into three categories. Symptoms of the different mosaic virus of potatoes may be similar, so the actual type usually can’t be identified by symptoms alone and is often just referred to as mosaic virus in potatoes.
TMV contains :-
Tobacco mosaic virus (TMV) is a positive-sense single stranded RNA virus in genus Tobamovirus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae. The infection causes characteristic patterns, such as "mosaic"-like mottling and discoloration on the leaves (hence the name). TMV was the first virus ever to be discovered. Although it was known from the late 19th century that an infectious disease was damaging tobacco crops, it was not until 1930 that the infectious agent was determined to be a virus. It is the first pathogen identified as a virus.
Mumps are caused by :-
Causes of mumps. Mumps is due to an infection by themumps virus. It can be transmitted by respiratory secretions (e.g. saliva) from a person already affected with the condition. When contracting mumps, the virus travels from the respiratory tract to the salivary glands and reproduces,causing the glands to swell.
AIDS is due to :-
CD4 lymphocytes (T4 cells). Since the progressive elimination of T4 cells is caused by HIV, it appears that the active replication and levels of viremia determine the phases of HIV infection.
PSTV have :-
A virus is a small parasite that cannot reproduce by itself. Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded. The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein.
Viruses largely lack metabolic machinery of their own to generate energy or to synthesize
Viruses do not, however, carry out metabolic processes. Most notably, viruses differ from living organisms in that they cannot generate ATP. Viruses also do not possess the necessary machinery for translation, as mentioned above. They do not possess ribosomes and cannot independently form proteins from molecules of messenger RNA. Because of these limitations, viruses can replicate only within a living host cell. Therefore, viruses are obligate intracellular parasites. According to a stringent definition of life, they are nonliving.
The rabies virus contain :-
Rabies lyssavirus, formerly Rabies virus, is a neurotropic virus that causes rabies in humans and animals. Rabies transmission can occur through the saliva of animals and less commonly through contact with human saliva. These viruses are enveloped and have a single stranded RNA genome with negative-sense.
The protein coat of the virus is called :-
A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. Some viruses are enveloped, meaning that the capsid is coated with a lipid membrane known as the viral envelope.
The virus without nucleic acid is called :-
Prions, so-called because they are proteinaceous, are infectious particles, smaller than viruses, that contain no nucleic acids (neither DNA nor RNA).
Which resistant proteins are formed in an eukaryotic cell due to virus infection :-
Interferon act as cell medeated immunity when one pathogen attacks the immune system it get treated and it get set as memory and when the same pathogen attacks again interferon act against it.
Which part of plant is not infected by virus :-
Apical meristem is a region of rapidly-dividing cells found at a plant's root and shoot tips. Division of these cells always results in primary (vertical) growth, both at the root and shoot. This type of tissue is undifferentiated.
Infective unit of virus is called :-
A complete virus particle, known as a virion, consists of nucleic acid surrounded by a protective coat of protein called a capsid. These are formed from identical protein subunits called capsomeres. Viruses can have a lipid "envelope" derived from the host cell membrane.
Tungro disease of rice is caused by
Rice tungro disease is caused by the combination of two viruses, which are transmitted by leafhoppers. It causes leaf discoloration, stunted growth, reduced tiller numbers and sterile or partly filled grains.
Match the column-I with column–II and choose the correct option :-
"Antibiotic" name proposed by :-
Waksman is credited with coining the term antibiotics, to describe antibacterials derived from other living organisms, for example penicillin, though the term was used by the French dermatologist François Henri Hallopeau, in 1871 to describe a substance opposed to the development of life.
Match the type of protozoans given in column-I with their examples given in column-II and choose the correct option.
Protozoans are single celled microscopic eukaryotic organisms that are noted for their ability to move independently. Protozoans are classified on the basis of their locomotion - amoeboid (Amoeba), ciliated (Paramoecium), flagellated (Trypanosoma) and sporozoans (Plasmodium).
Caulimovirus have :-
Cauliflower mosaic virus (CaMV) is a member of the genus Caulimovirus, one of the six genera in the Caulimoviridae family, which are pararetroviruses that infect plants. Pararetroviruses replicate through reverse transcription just like retroviruses, but the viral particles contain DNA instead of RNA.
Viroids have :-
Viroids are the smallest infectious pathogens known. They are composed solely of a short strand of circular, single-stranded RNA that has no protein coating. All known viroids are inhabitants of higher plants, in which most cause diseases, some of which are of slight to catastrophic economic importance.
Influenza is caused by :-
Myxovirus, any of a group of viruses of the families Orthomyxoviridae (agents of influenza) and Paramyxoviridae, members of which can cause the common cold, mumps, and measles in humans, canine distemper, rinderpest in cattle, and Newcastle disease in fowl.
The literal meaning of virus is a :-
Any of various submicroscopic agents that infect living organisms, often causing disease, and that consist of a single or double strand of RNA or DNA surrounded by a protein coat. Unable to replicate without a host cell, viruses are typically not considered living organisms.
Mycophage have :-
The majority of mycoviruses have double-stranded RNA genomes and isometric particles, but approximately 30% have positive-sense, single-stranded RNA genomes.
Virus are placed in :-
Virus is a microscopic particle that can infect the cells of a biological organism. Akaryota Viruses can only replicate themselves by infecting a host cell and therefore cannot reproduce on their own.
Which character favours nonliving nature of virus :-
A virus is a unit of infectious genetic material, generally smaller than bacteria. Viruses are considered to be both living and non-living as they possess the characteristics of living organisms and non-living substances. They are considered to be living as they possess a protein coat as a protective covering, DNA as the genetic material etc. They are said to be non-living as they can be crystallised and they survive for billions of years.
A phage that invades (attacks) in a host cell but does not destroy it, is know as :-
In virology, temperate refers to the ability of some bacteriophages (notably coliphage λ) to display a lysogenic life cycle. Many (but not all) temperate phages can integrate their genomes into their host bacterium's chromosome, together becoming a lysogen as the phage genome becomes a prophage.
Enzyme synthesis does not occur in :-
Which of the following characters justify the living nature of viruses :-
Viruses are small infectious agent that replicate only inside the living cell of other organisms. And capsid is a protein shell of viruses. Most mutable viruses are chicken pox, HIV, influenza.
Virus diseases are not generally spread through :-
Which of the following process is absent in virus :-
Production is carried out in power stations (also called "power plants"). Electricity is most often generated at a power plant by electromechanical generators, primarily driven by heat engines fueled by combustion or nuclear fission but also by other means such as the kinetic energy of flowing water and wind.
Which of the following is devoid of protein coat and entirely composed of RNA only :-
Viroids are the smallest infectious pathogens known. They are composed solely of a short strand of circular, single- stranded RNA that has no protein coating. This viroid is called as Potato Spindle Tuber Viroid (PSTV).
CJD caused by
Creutzfeldt-Jakob disease (CJD) is caused by an abnormal infectious protein in the brain called a prion. Proteins are molecules made up of amino acids that help the cells in our body function. They begin as a string of amino acids that then fold themselves into a 3-dimensional shape.