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[A] : Mitochondria and chloroplasts are ...

[A] : Mitochondria and chloroplasts are semiautonomous organelles .
[R] : They are formed by division of preexisting organellesas well as contain DNA but lack protein synthesizing machinery .

A

Both (a) and (b) are false

B

Both (a) and (b) are correct

C

(b) is true but (a) is false

D

(a) is true but (b) is false

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Assertion : Mitochondria and chloroplasts are semiautonomous organelles. Reason : They are formed by division of pre-existing organelles as well as contain DNA but lack protein synthesizing machinery

Other than nucleus organelles like mitochnodria and chloroplast also contain DNA

[A] : Histone proteins are synthesized during S phase . [R] : Histone proteins are found associated with DNA to form beed like nucleosomes .

[A] : The mechanism of ATP formation in mitochondria is almost similar to that of chloroplast. [R]: In mitochondria there is proton gradient formation inside intermembrane space whereas in chloroplast proton gradient is formed in thylakoid lumen.

[A] : Chloroplasts contain circular DNA , rRNA , mRNA and are also able to conduct protein synthesis . [R] : Origin of chloroplasts is from the proplastids.

Which one contains DNA (i) Mitochondria (ii) Chloroplasts (iii) Golgi bodies (iv) Ribosomes

[A] : Proteins and RNA are synthesized in G_(2) phase of cell division . [R] : PSI is located on outer surface of thylakoid .

Go through the following statements: (i) a typical nucleosome contains 400 bp of DNA helix. (ii) The positively charged DNA is wrapped around the negatively charged histoned octamer to form a structure called nucleosome. (iii) Histones are rich in the basic amino acid residues asparagine ad valine (iv) The packaging of chromatin at higher level requires additional set of proteins that collectively are referred to as nonhistone chromosomal proteins. Find out the wrong statements:-

[A] : In mammals, ends of presynaptic fibres are enlarged to form synaptic Knobs which are separated by a synaptic cleft from postsynaptic neurons. Each synaptic knob contains many mitochondria and small gran- ule-Iike synaptic vesicles filled with minute packets of the chemical that transmits im- pulses to postsynaptic neurons. [R]: The chemical transmitters are called neurohumors which proportionate to K^+ in- flux.

TRUEMAN BIOLOGY-(AIPMT(NEET Phase-1)-2016)(Conducted by CBSE on 01-05-2016)(Solved Paper)-MCQs
  1. Water soluble pigment present in cell vascuole is

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  2. Which of the following pairs of hormones are not antagonistic (having ...

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  3. [A] : Mitochondria and chloroplasts are semiautonomous organelles . ...

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  4. Which of the following is not a feature of the plasmids?

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  5. A plant in your garden avoids photorespiratory losses, has improved wa...

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  6. Emerson's enhancement effect and red drop have been instrumental in th...

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  7. Which type of tissue correctly matches with its location

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  8. When does the growth rate of a population following the logistic model...

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  9. Which one of the following statements is not true?

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  10. Which one of the following statements is wrong?

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  11. The Avena curvature is used for bioassay of

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  12. Which of the following structures is homologous to the wing of a bird?...

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  13. Blood pressure in the pulmonary artery is

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  14. Fertilization in humans is practically feasible only if

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  15. In meiosis crossing over is initiated at

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  16. Chrysophytes, Euglenoids, Dinoflaegellates and Slime moulds are includ...

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  17. Lack of relaxation between successive stimuli in striated muscle contr...

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  18. Identify the correct statement on 'inhibin'.

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  19. Name the chronic respiratory disroder caused maninly by cigarette smok...

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  20. Which of the following most appropriately describes haemophilia?

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