Spindle fibres of mitotic cell are made up of from Biology NEET

Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Acromegaly is due to hypersecretion of

  • insulin

  • thyroxine

  • growth hormone

  • None of these


2.

Fifth cranial nerve of frog is called

  • vagus

  • trigeminal

  • optic

  • ophthalmic


3.

Which of the following is made up of a single bone in mammals?

  • Dentary

  • Hyoid

  • Upper jaw

  • All of these


4.

If frog's brain is crushed, even then its leg moves on pinpointing. It is called

  • simple reflex

  • conditional reflex

  • neurotransmitter function

  • autonomic nerve condition


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5.

Gemmule formation in sponges are useful in

  • asexual reproduction

  • sexual reproduction

  • parthenogenesis

  • parthenocarpy


6.

Which of the following is not a mental disorder?

  • Epilepsy

  • Neurosis

  • Psychosis

  • Plague


7.

Brunner's glands are present in

  • duodenum

  • oesophagus

  • ileum

  • stomach


8.

Sella turcica is found

  • near pituitary

  • in bones

  • in joints

  • near thyroid


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9.

Spindle fibres of mitotic cell are made up of

  • tubulin

  • actin

  • myosin

  • collagen


A.

tubulin

Spindle fibres are formed during cell division. These are made up of tubulin. Each tubulin molecule is made up of a. and B sub-units. Tubulin molecules are attached heat to tail and form a strand and 13 strands aggregate to form a microtubule. These microtubules are attached to kinetochores of. metaphase chromosomes and play an important role in the movement of chromosomes during subsequent stages of cell division.


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10.

Systemic heart refers to

  • entire heart in lower vertebrates

  • the two ventricles together in humans

  • the heart that contracts under stimulation from nervous system

  • left auricle and left ventricle in higher vertebrates


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