"Potato mosaic" disease is caused by:
Mumps is caused by:
Mumps is caused due to an infection by the mumps virus.
AIDS is caused due to:
The Potato Spindle Tuber Viroid ("PSTVd"), the first viroid to be identified, is a small, circular RNA molecule closely related to the Chrysanthemum stunt viroid.
Since it is a viroid and contains single-stranded RNA, option A is correct and other options are wrong.
Viruses largely lack metabolic machinery of their own to generate energy or to synthesize :
The rabies virus contains:
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.
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 a eukaryotic cell due to virus infection?
Interferon act as cell mediated immunity when one pathogen attacks the immune system it gets treated and set as memory. So when the same pathogen attacks again interferon act against it.
Which part of plant is NOT infected by virus ?
Apical meristem is not infected by the virus because the rate of division of meristematic cell is higher than the rate of multiplication of virus and viruses are unable to invade newly formed meristematic cells.
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.
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 was proposed by:
Waksman is credited with coining the term antibiotics, to describe antibacterials derived from other living organisms.
All eukaryotic unicellular organisms belong to:
All single-celled eukaryotes are placed in Kingdom Protista.
Phylogenetically the Kingdom Protista acts as a connecting link between the prokaryotic Kingdom - Monera on one hand and the complex multicellular kingdoms - Fungi, Plantae and Animalia on the other hand.
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.
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:
Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. The name is from a Latin word meaning “slimy liquid” or “poison.”
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:
Hence, option C is correct.
Which character favours the 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.
A phage that invades (attacks) in a host cell but does not destroy it, is known as :
Enzyme synthesis does NOT occur in :
Uncoating happens inside the cell when the viral capsid is removed and destroyed by viral enzymes or host enzymes, thereby exposing the viral nucleic acid
Which of the following characters justify the living nature of viruses :
Virus diseases are NOT generally spread through :
Which of the following process is absent in virus:
A virus is a small infectious agent, that replicates only inside the living cells of other organisms.
Option A: Viruses can undergo replication by lytic and lysogenic cycles.
Option B: The feature of viruses to perform viral genetic change in their own genome is a process of virus mutation.
Option C: The energy production and liberation process are absent in viruses, as this process is not required by viruses.
Hence, option C is correct.
Which of the following is devoid of protein coat and entirely composed of RNA only :
CJD caused by: