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Fossil protists often associated with pe...

Fossil protists often associated with petroleum bearing rocks are

A

radiolarians

B

ciliates

C

foraminiferan shells

D

cellular slime moulds

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The correct Answer is:
C
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It is not always easy to predict the position of attack on multiply substituted benzene. If the benzene ring bears different ortho//para directing group at the 1 and 4 positions, the position of further substitution is not immediately clear. Sometimes steric effects determine the outcome. In other cases, electronic factors determine the outcome, and further reaction will be at the position activated by the more strongly activating group. Some substituens are so strongly activating that no catalyst is needed, and it is often diffcult to stop substitution after mono substituion. Mild condition are needed to restrict the reaction to mono-substitution. It is possible to reduce the activity such groups by side chain reaction so that the reaction can be stopped use can sometimes be made of removable blocking groups on the ring. Which of the following synthesis could be done in the ring step ?

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TRUEMEN BIOLOGY ENGLISH-KINGDOM PROTISTA (UNICELLULAR EUKARYOTES)-MULTIPLE CHOICE QUESTIONS
  1. G-6-P dehydrogenase deficiency is associated with heamolysis of :

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  2. The outer covering of which organism is used as abrasive for metal pol...

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  3. Fossil protists often associated with petroleum bearing rocks are

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  4. Mosquito Day is celebrated on

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  5. In bioluminescence, chemical energy is changed into

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  6. Phagotrophic nutrition is present in

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  7. Slime moulds in the division Myxomycota (true slime moulds) have

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  8. The mass of streaming protoplasm (wallless mass of multinucleate proto...

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  9. Most phases of the life cycles of plasmodial slime moulds are

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  10. Example of Multinucleate decomposer organism is

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  11. Branched veins with flowing protoplasm occur in

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  12. The slug-like phase of the cellular slime mould life cycle is called a

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  13. Slime moulds resemble fungi in

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  14. Erection of kingdom protista is justified by the organisms like

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  15. In the life cycle of cellular slime moulds, there is complete absence ...

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  16. Which is found in slime moulds but not in fungi ?

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  17. Cellulose digestion in termites is carried out by

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  18. Contractile vacuoles present in protozoa serves the purpose of

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  19. Trichomonas is found in the

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  20. Parasite of Kala-azar (dumdum fever) is transmitted by Sand fly (Phleb...

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