Biology MCQs

Page No. 31

Which of the following statement about an arthropod exoskeleton is incorrect?


aIt permits gaseous exchange

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bIt contains joints, for the same purpose as present in human skeletal system

✓


cIt provides muscle attachment

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dLike all the other types of exoskeleton, they lack sensation

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Rigor mortis i.e, stiffening of body after death results from__________?


aAccunulation of rigid proteins molecules in sarcoplam.

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bUnavailability of ATP, which is necessary to break the link between actin and myosin.

✓


cDecrease in body temperature after death.

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dDeath of tissue due to unavailability of O2.

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Exoskeleton of a marine snail is composed of________________?


aCaPO4

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bCaCO3

✓


cCaSO4

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dSiO2

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View Answer CaCO3

Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.


aBinding sites of actin get attached to the myosin head.

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bTroponin uncovers the actin binding sites.

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cTropomyosin gets removed from the binding sites of actin filaments.

✓


dCa2+ goes back inside sarcoplasmic reticulum.

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What happens during muscle contraction to the length of each myosin and action filament?


aZ- lines get closer

✓


bA band becomes short

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c1 band elongates

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dThere is no change in sarcomere

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View Answer Z- lines get closer

Which one of the following forms the blk of exoskeleton of an arthropod?


aEpicuticle

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bProcuticle

✓


cEctocuticle

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dNone of these

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View Answer Procuticle

If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules:


a9

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b5

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c6

✓


d7

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View Answer 6

Which of the following statement is incorrect about Molluscans?


aThey are surrounded by single or double pieces of hard skeleton.

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bTheir shell grows as the animal grows.

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cThey have hydrostatic skeleton.

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dThey move by tube feet

✓



The most important function of troponin is___________?


aTo bind with actin

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bTo bind with tropomyosin.

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cTo bind with Ca2+ ions.

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dAll of these

✓


View Answer All of these

In an annelids, the contraction of circular muscle results in___________?


aLengthening of the body.

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bShortening of the body.

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cWidening of body

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dThinning of body

✓


View Answer Thinning of body

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