Home
Class 12
BIOLOGY
Which of the given statements is not tru...

Which of the given statements is not true for viruses?
(a) They are nucleoproteins where protein is infectious in nature
(b) They can be crystallized and crystals consists largely of proteins
(c) Virus means venom or poisonous fluid
(d) A virus can never have both DNA and RNA as its genetic material

A

They are nucleoproteins where protein is infectious in nature

B

They can be crystallized and crystals consists largely of proteins

C

Virus means venom or poisonous fluid

D

A virus can never have both DNA and RNA as its genetic material

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • TEST 5

    AAKASH INSTITUTE ENGLISH|Exercise EXAMPLE|625 Videos
  • TEST 4

    AAKASH INSTITUTE ENGLISH|Exercise TYPE |1 Videos
  • TEST 6

    AAKASH INSTITUTE ENGLISH|Exercise EXAMPLE|712 Videos

Similar Questions

Explore conceptually related problems

Which of the following statements is not applicable to viruses? (a) The virus replicates in a bacterial host. (b) The protein coat of a virus does not enter the host cell. (c) The genetic material is DNA or RNA. (d) The virus replicates autonomously in the absence of a host.

Which of the following statements regarding viruses are correct? (i) These are cellular, infectious, nucleoprotein particles. (ii) They can be grown in culture medium. (iii) Genetic material is either DNA or RNA, but never both. (iv) They can be crystallised.

Read the given statements that describe certain infectious particle. (i) It was discovered T.O. Diener and was found to be smaller than viruses. (ii) It causes potato spindle tuber disease. (iii) It is a free RNA particle which lacks the protein coat. (iv) It has low molecular weight RNA as genetic material. Which of the following is referred to here?

Considering the inheritence of a disorder like colourblindness,state the given statements as True(T) or False(F) and choose the correct option (A)Both affected mother and father can never have an unaffected children, (B) Both affected parents(mother and father) can have affected male child but unaffected female child, (C) If a child has disorder,then his or her grandparents must have the trait if not the disorder, (D) A marriage between an affected female and an unaffected male can produce all unaffected children.

Consider the given statements and select the true ones. (a) health could be designed as a state of complete - physical, mental and social well being (b) pathogens can enter our body by various means, multiply and not interfere with normal vital activities (c) Salmonella typhi is a paihogenic virus which causes typhoid fever (d) Plague and diphtheria are bacterial disease in man

Which is not true statement ? (a) alpha carbon of alpha amino acid is asymmetric (b)All proteins are found in L-form (c)Human body can synthesis all proteins they need (d)At pH=7 both amino and carboxylic groups exist in ionised form

When an atom or an ion is missing from its normal lattice site, a lattice vacancy (Schottky defect) is created. In stoichimetric ionic crystals, a vacancy of one ion has to be accompanied by the vacancy of the oppositely charged ion in order to maintain electrical neutrality. In a Frenkel defect an ion leaves its position in the lattice and occupies an interstitial void. This is the Frenkel defect commonly found along with the Schottky defects and interstitials. In pure alkali halides, Frenkel defects are not found since the ions cannot get into the interstitial sites. Frenkel defects are found in silver halides because of the small size of the Ag^(+) ion. Unlike Schottky defects, Frenkel defects do not change the denstiy of the solids. In certain ionic solids (e.q. AgBr) both Schottky and Frenkel defects occur. The defects discussed above do not disturb the stoichiometry of the crystalline material. There is large variety of non-stoichiomertic inorganic solids which contain an excess or deficiency of one of the elements. Such solids showing deviations from the ideal stoichiometric composition from an inmportant group of solids. For example in the vanadium oxide, VO_(x) , x can be anywhere between 0.6 and 1.3. There are solids which are difficult to prepare in the stoichiometric composition. Thus, the ideal composition in compounds such as FeO is difficult to obtain (normally we get a composition of Fe_(0.95)O but it may range from Fe_(0.93)O " to " Fe_(0.96)O ). Non-stoichiometric behaviour is most commonly found for transition metal compounds though is also known for some lanthanoids and actinoids. Zinc oxide loses oxygen reversibly at high temperature and turns yellow in colour. The excess metal is accommodated interstitially, giving rise to electrons trapped in the neighbourhood. The enhanced electrical conductivity of the non-stoichiometric ZnO arises from these electrons.ltrbgt Anion vacancies in alkali halides are produced by heating the alkali halide crystals in an atmosphere of the alkali metal vapur. When the metal atoms deposit on the surface they diffuse into the crystal and after ionisation the alkali metal ion occupies cationic vacancy whereas electron occupies anionic vacancy. Electrons trapped in anion vacancies are referred to as F-centers (from Farbe the German word for colour) that given rise to interesting colour in alkali halides. Thus, the excess of potassium in KCl makes the crytal appear violet and the excess of lithium in LiCl makes it pink. Stongly heated ZnO crystal can conduct electricity. This is due to

When an atom or an ion is missing from its normal lattice site, a lattice vacancy (Schottky defect) is created. In stoichimetric ionic crystals, a vacancy of one ion has to be accompanied by the vacancy of the oppositely charged ion in order to maintain electrical neutrality. In a Frenkel defect an ion leaves its position in the lattice and occupies an interstitial void. This is the Frenkel defect commonly found along with the Schottky defects and interstitials. In pure alkali halides, Frenkel defects are not found since the ions cannot get into the interstitial sites. Frenkel defects are found in silver halides because of the small size of the Ag^(+) ion. Unlike Schottky defects, Frenkel defects do not change the denstiy of the solids. In certain ionic solids (e.q. AgBr) both Schottky and Frenkel defects occur. The defects discussed above do not disturb the stoichiometry of the crystalline material. There is large variety of non-stoichiomertic inorganic solids which contain an excess or deficiency of one of the elements. Such solids showing deviations from the ideal stoichiometric composition from an inmportant group of solids. For example in the vanadium oxide, VO_(x) , x can be anywhere between 0.6 and 1.3. There are solids which are difficult to prepare in the stoichiometric composition. Thus, the ideal composition in compounds such as FeO is difficult to obtain (normally we get a composition of Fe_(0.95)O but it may range from Fe_(0.93)O " to " Fe_(0.96)O ). Non-stoichiometric behaviour is most commonly found for transition metal compounds though is also known for some lanthanoids and actinoids. Zinc oxide loses oxygen reversibly at high temperature and turns yellow in colour. The excess metal is accommodated interstitially, giving rise to electrons trapped in the neighbourhood. The enhanced electrical conductivity of the non-stoichiometric ZnO arises from these electrons.ltrbgt Anion vacancies in alkali halides are produced by heating the alkali halide crystals in an atmosphere of the alkali metal vapur. When the metal atoms deposit on the surface they diffuse into the crystal and after ionisation the alkali metal ion occupies cationic vacancy whereas electron occupies anionic vacancy. Electrons trapped in anion vacancies are referred to as F-centers (from Farbe the German word for colour) that given rise to interesting colour in alkali halides. Thus, the excess of potassium in KCl makes the crytal appear violet and the excess of lithium in LiCl makes it pink. When LiCl is heated into the vapour of lithium, the crystal acquires pink colour. This is due to

read the following statements w.r.t tobacco mosaic virus. (a) it is rod like elongated virus which is 3000 A long and 180 A in diameter. (b) it consists of 2130 capsomeres, arranged helically to form the capsid. (c) its genetic material is ds RNA (d) its RNA consists of 6400 nucleotides (e) Nucleotide Capsomeres ratio is 3: 1. select the correct option

Read the following five statements in context of a plasmid. (a) Its DNA is always double stranded. (b) Its DNA is naked and without histone proteins. (c) Its DNA can replicate independent of genomic DNA. (d) Both exons and introns are present in plasmid DNA. (e) Plasmid DNA can be either linear or circular. Which of the above given statements are incorrect?

AAKASH INSTITUTE ENGLISH-TEST 5-EXAMPLE
  1. Members regarded as "fungi imperfecti" are related to all the followin...

    Text Solution

    |

  2. Viruses which are involved in transduction usually have their genetic ...

    Text Solution

    |

  3. Which of the given statements is not true for viruses? (a) They are nu...

    Text Solution

    |

  4. Viruses and viroids are similar in (a) Having capsid (b) Having only...

    Text Solution

    |

  5. Viruses were first Crystallised by

    Text Solution

    |

  6. A common feature between TMV and HIV is

    Text Solution

    |

  7. Read the following statement and state them as True (T) or False (F) (...

    Text Solution

    |

  8. On the basis of sequences of 16s ribosomal RNA genes, Carl Woese place...

    Text Solution

    |

  9. Primitive bacteria which are found in guts of ruminant animals,do not ...

    Text Solution

    |

  10. Stilt roots differ from prop roots in

    Text Solution

    |

  11. Identify the odd one w.r.t. the type of modified root

    Text Solution

    |

  12. Chlorophyll containing fleshy cylindrical structure found in Euphrobi...

    Text Solution

    |

  13. Which of the following statements is not true for runner?

    Text Solution

    |

  14. Adaptation of water plants.

    Text Solution

    |

  15. In Venus-fly-trap,the leaf is modified into special structures to

    Text Solution

    |

  16. Read the following charecters and mark the correct ones for family Fab...

    Text Solution

    |

  17. Cymose inflorescence differs from racemose inflorescence in

    Text Solution

    |

  18. Margins of petals or sepals overlap each other but not in a definite m...

    Text Solution

    |

  19. China rose,tomato and lemon all are common in having

    Text Solution

    |

  20. Pigment present in green plants is

    Text Solution

    |