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4

The genetic material of virus includes

A. only RNA.

B. only DNA.

C. RNA and DNA both

D. RNA or DNA i.e. one nucleic acid in a virus.

Correct Answer :

D. RNA or DNA i.e. one nucleic acid in a virus.


Viruses are obligate intracellular parasite which can reproduce only by invading and taking over other cells as they lack the cellular machinary for self reproduction. Viruses have either DNA or RNA as the genetic material. Viruses having RNA as the genetic material are known as Retroviruses.

Related Questions

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4

Fungi are filamentous with the exception of X which is unicellular. Identify X.

A. Yeast

B. Algae

C. Bacteria

D. Lichen

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4

Which of the following is smallest living cell and can live without oxygen ?

A. Mycoplasma

B. Mycorrhiza

C. Euglena

D. Trypanosoma

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4

Which of the following pair is not correctly matched ?

A. Anabaena Cyanobacteria

B. Amoeba Protozoa

C. Gonyaulax Dinoflagellates

D. Albugo Chrysophytes

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4

Which of the following statement(s) is/are correct ?
(i) Reproduction in fungi can take place by vegetative means fragmentation, fission and budding.
(ii) Fusion of two nuclei is called plasmogamy.
(iii) Fusion of protoplasms between two motile or nonmotile gametes is called karyogamy.
(iv) Meiosis in zygote results in diploid spores.

A. Only (i)

B. Both (ii) and (iii)

C. (ii), (iii) and (iv)

D. All of these

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4

Which of the following statements regarding cyanobacteria is incorrect?

A. It is also called blue green algae.

B. They are chemosynthetic autotrophs.

C. It forms blooms in polluted water bodies.

D. It is unicellular, colonial or filamentous, marine or terrestrial bacteria.

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4

Yeast is not included in protozoans but in fungi because

A. it has no chlorophyll.

B. some fungal hyphae grow in such a way that they give the appearance of pseudomycelium.

C. it has eukaryotic organization.

D. cell wall is made up of cellulose and reserve food material is starch.

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4

Read the following statements and answer the question.
(i) Some members are saprophytes or parasites while a large number of them are decomposers of litter and help in mineral cycling.
(ii) They reproduce only by asexual spores known as conidia.
(iii) Mycelium is septate and branched.
(iv) Alternaria, Colletotrichum and Trichoderma are examples of this class.
Which of the following class of fungi is being described by the above statements ?

A. Phycomycetes

B. Deuteromycetes

C. Basidiomycetes

D. Ascomycetes

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4

A fungus contains cells with two nuclei from different genomes. The nuclei do not fuse but divide independently and simultaneously as new cells are formed. This fungus belongs to

A. phycomycetes

B. zygomycetes

C. deuteromycetes

D. basidiomycetes

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4

Which of the following is a parasitic fungi on the mustard plant ?

A. Albugo

B. Puccinia

C. Yeast

D. Ustilago

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4

Protista includes

A. unicellular eukaryotes with well-defined nucleus only.

B. unicellular prokaryotes with membrane bound organelles.

C. unicellular eukaryotes with well-defined nucleus and membrane bound organelles.

D. both unicellular and multicellular eukaryotes with welldefined nucleus and membrane bound organelles.

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4

Ustilago causes plant diseases (called smuts) because

A. they parasitize on cereals.

B. they lack mycelium.

C. they develop sooty masses of spores.

D. their affected parts becomes completely black.

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4

Match the scientists given in column I with their discovery given in column II and choose the correct option.
Column-IColumn-II
(Scientists)(Discovery)
A. Ernst MayrI. Discovered Viroids
B. WhittakerII. Gave the name virus
C. PasteurIII. Proposed five kingdom classification
D. DienerIV. Darwin of the 20th century

A. A IV, B III, C II, D I

B. A III, B IV, C II, D I

C. A II, B III, C IV, D I

D. A I, B II, C III, D IV

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4

Which one of the following statement is correct for archaea?

A. Archaea resemble eukaryotes in all respects.

B. Archaea have some novel features that are absent in other prokaryotes and eukaryotes.

C. Archaea completely differ from both prokaryotes and eukaryotes.

D. Archaea completely differ from prokaryotes.

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4

Which of the following group of kingdom protista is being described by the statements given below ?
(i) This group includes diatoms and golden algae.
(ii) They are microscopic and float passively in water currents (plankton).
(iii) Most of them are photosynthetic.
(iv) They have deposits in their habitat; this accumulation over billion of years is referred to as diatomaceous earth.

A. Dinoflagellates

B. Chrysophytes

C. Euglenoids

D. Slime moulds

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4

Chemosynthetic autotrophic bacteria are named so because

A. they oxidize various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for their ATP production.

B. they oxidize various organic substances and use the released energy for their ATP production.

C. both (a) and (b)

D. none of these

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4

Bladderwort and Venus fly trap are examples of

A. insectivorous plants

B. parasitic plants

C. N2 rich plants

D. aquatic plants

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4

How many bacteria are produced in four hours if a bacterium divides once in half an hour ?

A. 8

B. 64

C. 16

D. 256

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4

Which of the following statement(s) is/are correct about class basidiomycetes ?
(i) They are commonly known as imperfect fungi because only the asexual or vegetative phases of these fungi are known.
(ii) They grow in soil, on logs and tree stumps and in living plant bodies as parasites, e.g., rusts and smuts.
(iii) The mycelium is branched and septate.
(iv) Some common members are Agaricus, Ustilago and Puccinia.

A. Only (i)

B. Both (ii) and (iii)

C. (ii), (iii) and (iv)

D. All of these

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4

The given figure shows the structure of filamentous blue green algae, Nostoc with a structure marked as X. Select the option which shows the correct identification of the X with its feature.
img5

A. Spores - Reproduction

B. Heterocysts - Nitrogen fixation

C. Pellicle - Recycling of nutrition

D. Mucilaginous sheath - Photosynthesis

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4

Match column I (Kingdom) with column II (Class) and select the correct options
Column-IColumn-II
(Kingdom)(Class)
A. PlantaeI. Archaebacteria
B. FungiII. Euglenoids
C. ProtistaIII. Phycomycetes
D. MoneraIV. Algae

A. A IV, B III, C II, D I

B. A I, B II, C III, D IV

C. A III, B IV, C II, D I

D. A IV, B II, C III, D I

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4

Bacteria are found to be primitive organisms because they

A. are small, microscopic which are not seen with naked eye.

B. cause serious diseases to human being, domesticated animals and crop plants.

C. produce endospores which are very resistant to adverse conditions.

D. possess incipient nucleus and show amitotic division.

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4

Protists are

A. single-celled eukaryotes.

B. multicellular eukaryotes.

C. single-celled prokaryotes.

D. single-celled akaryote.

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4

The given figure shows some labelled structure as A, B, C and D. In which structure the protein coat that encloses the nucleic acid is present? 
img6

A. A

B. B

C. C sheath

D. D tail fibres

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4

The genetic material of virus includes

A. only RNA.

B. only DNA.

C. RNA and DNA both

D. RNA or DNA i.e. one nucleic acid in a virus.

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4

Why food can be kept for a longer time in cold house than in normal conditions ? Because,

A. insect cannot enter.

B. bacterial multiplication stops.

C. bacterial multiplication is reduced.

D. there is plasmolysis at low temperature.

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4

Which of the following statement is not correct for methanogens?

A. They are archaebacteria.

B. They live in marshy areas.

C. Methane is their preferred carbon source.

D. They are present in guts of several ruminant animals (cow, buffaloes) and produce biogas (CH4) from the dung of these animals.

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4

Which of the following pairs comes under the group chrysophytes ?

A. Diatoms and Euglena

B. Euglena and Trypanosoma

C. Diatoms and Desmids

D. Gonyaulax and Desmids

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4

Which of the following is used extensively in biochemical and genetic work ?

A. Agaricus

B. Alternaria

C. Neurospora

D. Mucor

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4

The figure given below shows the structure of a bacteriophage. Identify its parts labelled as A, B, C and D. 
img4

A. A - Tail fibres B - Head C - Sheath D - Collar

B. A - Sheath B - Collar C - Head D - Tail fibres

C. A - Head B - Sheath C - Collar D - Tail fibres

D. A - Collar B - Tail fibres C - Head D - Sheath

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4

Select the correct match from the given option.

A. Occurrence of dikaryotic stage - ascomycetes and basidiomycetes.

B. Saprophytes - They are autotrophic and absorb soluble organic matter from dead substrates.

C. Vegetative mean of reproduction in fungi - fragmentation, budding and sporangiophores.

D. Steps involved in asexual cycle of fungi - plasmogamy, karyogamy and meiosis in zygote resulting in haploid spores.