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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? 
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A. A

B. B

C. C sheath

D. D tail fibres

Correct Answer :

A. A


The structure marked as A, B, C and D are respectively head, collar, sheath and tail fibres. In head (structure marked as A), the protein coat (called the capsid) made of small subunits called capsomeres, protect the nucleic acid.

Related Questions

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4

The bacteria which oxidize various inorganic substances and use the released energy for their ATP production are called _______________.

A. Archaebacteria

B. Heterotrophic bacteria

C. Photosynthetic autotrophic bacteria

D. Chemosynthetic autotrophic bacteria

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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

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

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

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as

A. cyanobacteria

B. archaebacteria

C. chemosynthetic autotrophs

D. heterotrophic bacteria

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4

Protozons are not included in kingdom animalia because they are

A. mostly asymmetrical.

B. unicellular eukaryotes.

C. heterotrophic in nature.

D. multicellular prokaryotes.

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4

Match column-I (Characters/feature) with column-II (examples) and choose the correct option.
Column-IColumn-II
(Characters/features)(Examples)
A. Red dinoflagellatesI. Rhizopus
B. Unicellular fungi used toII. Gonyaulax make bread and beer
C. Source of antibioticsIII. Yeast
D. Bread mouldIV. Penicillium

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

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

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

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

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4

Which of the following statement is correct for dinoflagellates flagella ?

A. A single flagellum lies in the transverse groove between the cell plates.

B. A single flagellum lies in the longitudinal groove between the cell plates.

C. Two flagella, one lies longitudinally and the other transversely in a furrow between the wall plates.

D. Flagella are absent.

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4

Bacteria and yeast are similar in all the following features except that

A. both are unicellular.

B. both are prokaryotes.

C. both are capable of causing fermentation.

D. both produce spores.

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4

Which of the following pair is correctly matched ?

A. Fungi Saprophytic parasitic mode of nutrition.

B. Monera Nuclear membrane is present.

C. Plantae Cell wall is made up of cellulose.

D. Animalia Cell wall is absent.

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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

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

Bacteria lack alternation of generation because there is

A. neither syngamy nor reduction division.

B. no distinct chromosomes.

C. no conjugation.

D. no exchange of genetic material.

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4

Which one of the following is a characteristic feature of chrysophytes?

A. They are parasitic forms which cause diseases in animals.

B. They have a protein rich layer called pellicle.

C. They have indestructible wall layer deposited with silica.

D. They are commonly called dinoflagellates.

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4

Read the following statements and answer the question given below
(i) They are saprophytic protists.
(ii) Under suitable conditions, they form an aggregation (called plasmodium) which may grow and spread over several feet.
(iii) During unfavourable conditions, the plasmodium differentiates and forms fruiting bodies bearing spores at their tips.
Which of the following class of protists is being described by the above statements ?

A. Euglenoids

B. Dinoflagellates

C. Slime moulds

D. Protozoans

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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.

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4

Which of the following groups of protozoan is not correctly matched with its feature?

A. Amoeboid - Marine forms have silica shells on their surface.

B. Flagellated - Either free living or parasitic.

C. Ciliated - Actively moving organisms due to presence of cilia.

D. Sporozoans - Move and capture their prey with the help of false feet.

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4

Which scientist classify plants into trees, shrubs and herbs & animals into two groups having red blood cells and without red blood cells?

A. Aristotle

B. R. H. Whittaker

C. D. J. Ivanowsky

D. W. M. Stanley

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Which of the following characteristic(s) is used by Whittaker for the classification of organisms ?

A. Mode of nutrition

B. Thallus organisation

C. Phylogenetic relationships

D. All of the above

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4

Match the class of fungi given in column-I with their common name given in column-II and select the correct option.
Column-IColumn-II
(Class of fungi)(Common name)
A. PhycomycetesI. Sac fungi
B. AscomycetesII. Algal fungi
C. BasidiomycetesIII. Fungi imperfecti
D. DeuteromycetesIV. Club fungi

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

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

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

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

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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

Which class of fungi lacks sex organs but the process of plasmogamy is brought about by fusion of two vegetative or somatic cells of different strains or genotypes?

A. Sac fungi

B. Bracket fungi

C. Imperfect fungi

D. Phycomycetes

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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

Which of the following statement(s) is/are correct about ascomycetes ?
(i) Neurospora, which is used in biochemical and genetic work is a member of this class.
(ii) They are mostly multicellular, e.g., Yeast, or rarely unicellular, e.g., Penicillium.
(iii) They are saprophytic, decomposers, parasitic or coprophilous.
(iv) Some examples are Aspergillus, Claviceps and Neurospora.

A. Both (i) and (ii)

B. Only (ii)

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

D. All of these

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4

Mycorrhizae are useful for plants because they

A. fix atmospheric nitrogen.

B. enhance absorption of nutrients from the soil.

C. kill insects and pathogen.

D. provide resistance against abiotic stresses.

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4

Identify the basis of classification of fungi into phycomycetes, ascomycetes, basidiomycetes and deuteromycetes.
i. Fruiting bodies
ii. Nature of habitat
iii. Morphology of mycelium
iv. Mode of spore formation

A. i & ii only

B. ii & iii only

C. i, ii, & iv only

D. All of these

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4

Which of the following is the correct sequence of three steps in the sexual cycle of fungi?

A. Mitosis -> Meiosis -> Fertilization

B. Plasmogamy -> Karyogamy -> Meiosis

C. Mitosis -> Plasmogamy -> Karyogamy

D. Karyogamy -> Plasmogamy -> Meiosis

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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

Match column I with column II and choose the correct option.
Column IColumn II
A. Mycoplasma(i) Nitrogen fixing cells
B. Decomposers(ii) Blue green algae
C. Methanogens(iii) Production of methane
D. Heterocysts(iv) Most abundant heterotrophs
E. Cyanobacteria(v) Pathogenic in plants and animals

A. A-(i) B-(ii) C-(iii) D-(iv) E-(v)

B. A-(iii) B-(v) C-(ii) D-(iv) E-(i)

C. A-(iii) B-(i) C-(v) D-(ii) E-(iv)

D. A-(v) B-(iv) C-(iii) D-(i) E-(ii)

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4

Match the type of protozoans given in column-I with their examples given in column-II and choose the correct option.
Column-IColumn-II
(Type of Protozoans)(Examples)
A. Amoeboid protozoansI. Paramecium
B. Ciliated protozoansII. Plasmodium
C. Flagellated protozoansIII. Amoeba
D. SporozoansIV. Trypanosoma

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

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

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

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