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Test: Virus - 1


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30 Questions MCQ Test Biology Class 11 | Test: Virus - 1

Test: Virus - 1 for NEET 2022 is part of Biology Class 11 preparation. The Test: Virus - 1 questions and answers have been prepared according to the NEET exam syllabus.The Test: Virus - 1 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Virus - 1 below.
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Test: Virus - 1 - Question 1

"Potato mosaic" disease is caused by:

Detailed Solution for Test: Virus - 1 - Question 1
  • 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 viruses 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.
Test: Virus - 1 - Question 2

TMV contains:

Detailed Solution for Test: Virus - 1 - Question 2
  • Tobacco mosaic virus (TMV) is a positive-sense single stranded RNA virus 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.
Test: Virus - 1 - Question 3

Mumps is caused by:

Detailed Solution for Test: Virus - 1 - Question 3

Mumps is a viral infection caused by the mumps virus.

  • Mumps is extremely infectious and spreads quickly to people living nearby.
  • The virus is spread through respiratory droplets or through direct contact with an infected human.
  • It mainly affects salivary glands in the region of our ears and can cause inflammation in one or both of these glands. Mumps affect the parotid glands, the salivary glands behind and in front of the ears.
  • When contracting mumps, the virus travels from the respiratory tract to the salivary glands and reproduces, causing the glands to swell.
Test: Virus - 1 - Question 4

AIDS is caused due to:

Detailed Solution for Test: Virus - 1 - Question 4
  • AIDS(acquired immunodeficiency syndrome) is caused by the HIV virus. It breaks down the body immune system, leaving the patient vulnerable to a host of life-threatening opportunistic infections.
  • T-helper cells play an important role in adaptive immunity. They not only help activate B cells to secrete antibodies and macrophages to destroy ingested microbes, but they also help activate cytotoxic T cells to kill infected target cells.
  • HIV destroys(CD4+ cells) T-helper lymphocytes cells.They're responsible for keeping you healthy from common diseases and infections. As HIV gradually weakens your natural defences, signs and symptoms will occur.
  • Hence HIV attacks T-helper cells. Hence AIDS is caused by HIV that principally infects T-4 helper lymphocytes.
Test: Virus - 1 - Question 5

PSTV have:

Detailed Solution for Test: Virus - 1 - Question 5

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.

Test: Virus - 1 - Question 6

Viruses largely lack metabolic machinery of their own to generate energy or to synthesize :

Detailed Solution for Test: Virus - 1 - Question 6
  • Viruses do not carry out metabolic processes. Most notably, viruses differ from living organisms in that they cannot generate ATP.
  • They do not possess ribosomes and cannot independently form proteins from molecules of messenger RNA
Test: Virus - 1 - Question 7

The rabies virus contains:

Detailed Solution for Test: Virus - 1 - Question 7
  • Rabies lyssavirus, formerly Rabies virus, is a neurotropic virus that causes rabies in humans and animals. These viruses are enveloped and have a single-stranded RNA genome with negative sense.
  • Rabies transmission can occur through the saliva of animals and less commonly through contact with human saliva.

 

Test: Virus - 1 - Question 8

The protein coat of the virus is called:

Detailed Solution for Test: Virus - 1 - Question 8
  • The outer protein coat of a virus is known as the capsid. 
  • It consists of several oligomeric structural subunits made of a protein called protomers, which cover the nucleic acid which is present in the virus and protects it when virus inserts itself into the host.
  • The capsid proteins also help the virus attach and penetrate the host cells thereby infecting the host. 
Test: Virus - 1 - Question 9

The virus without nucleic acid is called:

Detailed Solution for Test: Virus - 1 - Question 9

Prions, so-called because they are proteinaceous, are infectious particles, smaller than viruses, that contain no nucleic acids (neither DNA nor RNA).

Test: Virus - 1 - Question 10

Which resistant proteins are formed in a eukaryotic cell due to virus infection?

Detailed Solution for Test: Virus - 1 - Question 10

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.

Test: Virus - 1 - Question 11

Which part of plant is NOT infected by virus ?

Detailed Solution for Test: Virus - 1 - Question 11

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.

Test: Virus - 1 - Question 12

Infective unit of virus is called:

Detailed Solution for Test: Virus - 1 - Question 12

A complete virus particle, known as a virion, consists of nucleic acid surrounded by a protective coat of protein called a capsid.

Test: Virus - 1 - Question 13

Tungro disease of rice is caused by :

Detailed Solution for Test: Virus - 1 - Question 13

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.

Test: Virus - 1 - Question 14

Match the column-I with column–II and choose the correct option:

Detailed Solution for Test: Virus - 1 - Question 14
  • φ x 174 bacteriophage - ss DNA
  • Mycophage - ds RNA
  • pox virus - ds DNA
  • Poliovirus - ss RNA
Test: Virus - 1 - Question 15

"Antibiotic" name was proposed by:

Detailed Solution for Test: Virus - 1 - Question 15

Waksman is credited with coining the term antibiotics, to describe antibacterials derived from other living organisms.

Test: Virus - 1 - Question 16

Which among the following are incorrect about Viruses?

Detailed Solution for Test: Virus - 1 - Question 16
  • Viruses can’t perform any of the metabolic activities when outside a living host. So, they are non-living organisms.
  • Viruses don’t even consist of a cell and so acellular.
  • They are in fact smaller than that of a bacterium and can even infect them.
Test: Virus - 1 - Question 17

Caulimovirus have:

Detailed Solution for Test: Virus - 1 - Question 17
  • 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  (double Strand) instead of RNA.
Test: Virus - 1 - Question 18

Viroids have:

Detailed Solution for Test: Virus - 1 - Question 18

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.

Test: Virus - 1 - Question 19

Influenza is caused by:

Detailed Solution for Test: Virus - 1 - Question 19

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.

Test: Virus - 1 - Question 20

The literal meaning of virus is a:

Detailed Solution for Test: Virus - 1 - Question 20

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.”

Test: Virus - 1 - Question 21

Mycovirus have:

Detailed Solution for Test: Virus - 1 - Question 21

The majority of mycoviruses have double-stranded RNA  genomes and isometric particles, but approximately 30% have positive-sense, single-stranded RNA  genomes.

Test: Virus - 1 - Question 22

Virus are placed in:

Detailed Solution for Test: Virus - 1 - Question 22
  • Viruses are considered neither prokaryotes nor eukaryotes because they lack the characteristics of living things, except the ability to replicate which they accomplish only in living cells.
  • Akaryota includes organisms having no cells. All viruses are placed under akaryota.

Hence, option C is correct.

Test: Virus - 1 - Question 23

Which character favours the nonliving nature of virus:

Detailed Solution for Test: Virus - 1 - Question 23

A virus is a unit of infectious genetic material, generally smaller than bacteria. Viruses are considered to be both living and non-living.

  • 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 crystallized and they survive for billions of years.
Test: Virus - 1 - Question 24

A phage that invades (attacks) in a host cell but does not destroy it, is known as :

Detailed Solution for Test: Virus - 1 - Question 24
  • 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.
Test: Virus - 1 - Question 25

Enzymes are not found in:

Detailed Solution for Test: Virus - 1 - Question 25
  • Viruses are made up of nucleic acid, which is DNA/RNA with protein. Cell membrane, protoplasm, ribosomes, etc., are absent. Since it lacks metabolism, it lacks enzymes.
  • Fungi, algae, and cyanobacteria, on the other hand, have a variety of enzymes as it is made up of the cell.
Test: Virus - 1 - Question 26

Which of the following characters justify the living nature of viruses :

Detailed Solution for Test: Virus - 1 - Question 26
  • Characters of living nature of viruses are: Viruses have genetic material (DNA or RNA). They can mutate.
  • They can grow, once inside the host cell. They can be transmitted from one host to another. They are capable of multiplication within a host.
  • They react to heat, radiation and chemicals. They show irritability.
  • They bring about enzymatic changes in vitro. They are able to infect and cause the disease to living beings.
  • The DNA and proteins of viruses are similar in composition and structure to those of higher organisms.
Test: Virus - 1 - Question 27

Virus diseases are NOT generally spread through :

Detailed Solution for Test: Virus - 1 - Question 27
  • The viral disease is caused due to infection of pathogenic virus that attacks the cells.
  • Transmission of plant viruses is through the transfer of sap, insects, nematodes, plasmodiophorids, seed and pollen and direct plant to human transmission. 
  • However, the spread of the virus does not take place through vegetative propagation.
Test: Virus - 1 - Question 28

Which of the following process is absent in virus:

Detailed Solution for Test: Virus - 1 - Question 28

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.

Test: Virus - 1 - Question 29

Which of the following is devoid of protein coat and entirely composed of RNA only :

Detailed Solution for Test: Virus - 1 - Question 29
  • Viroids are the smallest infectious pathogens known.
  • They are composed solely of a short strand of circular, single- stranded RNA that does not encode a protein. This viroid is called as Potato Spindle Tuber Viroid (PSTV).
Test: Virus - 1 - Question 30

CJD caused by:

Detailed Solution for Test: Virus - 1 - Question 30
  • 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.

Creutzfeldt-Jakob disease:

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