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A: Bacteria, cyanobacteria and mycoplasm...

A: Bacteria, cyanobacteria and mycoplasma are prokaryotes
R : Prokaryotes possess true nuclei having definite nuclear membrane.

A

A and R both are correct and R is correct explanation of A.

B

A and R are correct but R is not explanation of A.

C

A is correct and R is false.

D

A and R are false

Text Solution

Verified by Experts

The correct Answer is:
C
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Which of the following statements are true if about microbes ? (P) Both bacteria and fungi are prokaryotes. (Q) Except some microbes many microbes are useful to mankind (R) Some food materials which we take in our daily diet are obtained by microbial process. (S) Many products useful to mankind are synthesized at commercial level through microbes. (A) (P) and (S) (B) (Q), (R) and (S) (C) (P), (Q) and (R) (D) (P), (Q), (R) and (S)

Read the given statements and select the correct option Statement 1: In recombinant DNA technology, human genes are often transferred into bacteria (prokaryotes) or yeasts (eukaryotes). Statement 2: Both bacteria and yeast multiply very fast to form huge populations which express the desired gene.

Which of the following is correct: (a) Cells of all living organisms have a nucleus. (b) Both animal and plant cells have a well defined cell wall. (c) In prokaryotes, there are no membrane bound organelles. (d) Cells are formed de novo from abiotic materials.

The unit of length conventent on the nuclear scale is a fermi : 1f = 10^(-15) m. Nuclear sized obey roughly the following empirical relation: r = r_(0)A^(1//3) Where r is the radius of the nucleus, A its mass number, and r_(0) is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise . 2.27.

An electromagnetic wave can be represented by E = A sin (kx- omega t + phi) , where E is electric field associated with wave, According this equation, for any value of x, E remains sinusoidal for -oolt t lt oo . Obviously this corresponds to an idealised situation because radiation from ordinary sources consists of finite size wavetrains. In general, electric field remains sinusoidal only for times of order tau_(c) ' which is called coherence time. In simpler language it means that for times of order tau_(c)' a wave will have a definite phase. The finite value of coherence time could be due to many factors, for example if radiating atom undergoes collision with another atom then wave train undergoes an abrupt phase change or due to the fact that an atom responsible for emitting radiation has a finite life time in the energy level from which it drops to lower energy level, while radiating. Concept of coherence time can be easily understood using young's double slit experiment. Let interference patten is observed around point P at time t , due to superposition of waves emanting from S_(1) and S_(2) at times t =(r_(1))/(c) and (r_(2))/(c) respectively, where r_(1) and r_(2) are the distances S_(1) P & S_(2)P . Obviously if (r_(2)-r_(1))/(c) lt lt tau_(e),{"where" " "c = 3xx10^(8)m//s} then, wavetrain arriving at point P from S_(1) & S_(2) will have a definite phase relationship and an interference pattern of good contranst will be obtained. If coherence time is of order 10^(-10) second and screen is placed at a very large distance from slits in the given figure, then:-

An electromagnetic wave can be represented by E = A sin (kx- omega t + phi) , where E is electric field associated with wave, According this equation, for any value of x, E remains sinusoidal for -oolt t lt oo . Obviously this corresponds to an idealised situation because radiation from ordinary sources consists of finite size wavetrains. In general, electric field remains sinusoidal only for times of order tau_(c) ' which is called coherence time. In simpler language it means that for times of order tau_(c)' a wave will have a definite phase. The finite value of coherence time could be due to many factors, for example if radiating atom undergoes collision with another atom then wave train undergoes an abrupt phase change or due to the fact that an atom responsible for emitting radiation has a finite life time in the energy level from which it drops to lower energy level, while radiating. Concept of coherence time can be easily understood using young's double slit experiment. Let interference patten is observed around point P at time t , due to superposition of waves emanting from S_(1) and S_(2) at times t =(r_(1))/(c) and (r_(2))/(c) respectively, where r_(1) and r_(2) are the distances S_(1) P & S_(2)P . Obviously if (r_(2)-r_(1))/(c) lt lt tau_(e),{"where" " "c = 3xx10^(8)m//s} then, wavetrain arriving at point P from S_(1) & S_(2) will have a definite phase relationship and an interference pattern of good contranst will be obtained. If coherence time is of order 10^(-10) second and screen is placed at a very large distance from slits in the given figure, then:-

Cyanobacteria and heterotrophic bacteria have been clubbed together in eubacteria of kingdom-Monera as per the "five kingdom classification" even though the two are vastly different from each other. Is this grouping of the two types of taxa in the same kingdom justified ? If so, why ? Discuss the cellular composition of cyanobacteria and heterotrophic bacteria that make them introduced in eubacteria.

KUMAR PRAKASHAN-BIOLOGICAL CLASSIFICATION-OBJECTIVE SECTION (MULTIPLE CHOICE QUESTIONS : (MCQs))
  1. Which bacteria are the most abundant in nature ? (A) Heterotrophic ...

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  2. All single-celled eukaryotes are placed under  (A) Fungi (B) Proti...

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  3. The spores of slime moulds possess  (A) False walls (B) True wall...

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  4. The sea appears red due to rapid multiplication of  (A) Euglenoids ...

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  5. What is true for all protozoans ? (A) are heterotrophs (B) they a...

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  6. Chrysophytes which are the chief producers in the ocean?

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  7. Sleeping sickness is caused by  (A) Wuchereria (B) Amoeba (C) ...

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  8. Which is the parasitic fungi on mustard ? (A) Rhizopus (B) Mucor ...

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  9. Amoeboid protozoans are found in

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  10. Fungus used extensively in biochemical and genetic work  (A) Neurosp...

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  11. Which fungi is commonly known as imperfect fungi? (A) Basidiomycetes...

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  12. Viroids are  (A) parasitic DNA (B) free RNA (C) free DNA (D...

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  13. Which of the following is indicator of pollution ?  (A) Viroids (...

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  14. Colletotrichum belongs to  (A) Deuteromycetes (B) Ascomycetes ...

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  15. Rusts and smuts belongs to  (A) Deuteromycetes (B) Basidiomycetes...

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  16. A: Rhizopus does not form zygospores R: It shows heterothallism

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  17. A: A virus attacking a bacterium is called bacteriophage. R: A virus...

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  18. A: Bacteria, cyanobacteria and mycoplasma are prokaryotes R : Prokar...

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  19. A : Phycomycetes are generally called algal fungi. R: It is believed...

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  20. A : Mushrooms are not regarded plants. R : Unlike plants mushrooms a...

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