Biology MCQs

Page No. 31

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


aIt permits gaseous exchange


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


cIt provides muscle attachment


dLike all the other types of exoskeleton, they lack sensation



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


aAccunulation of rigid proteins molecules in sarcoplam.


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


cDecrease in body temperature after death.


dDeath of tissue due to unavailability of O2.



Exoskeleton of a marine snail is composed of________________?


aCaPO4


bCaCO3


cCaSO4


dSiO2


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.


bTroponin uncovers the actin binding sites.


cTropomyosin gets removed from the binding sites of actin filaments.


dCa2+ goes back inside sarcoplasmic reticulum.



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


aZ- lines get closer


bA band becomes short


c1 band elongates


dThere is no change in sarcomere


View Answer Z- lines get closer

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


aEpicuticle


bProcuticle


cEctocuticle


dNone of these


View Answer Procuticle

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


a9


b5


c6


d7


View Answer 6

Which of the following statement is incorrect about Molluscans?


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


bTheir shell grows as the animal grows.


cThey have hydrostatic skeleton.


dThey move by tube feet



The most important function of troponin is___________?


aTo bind with actin


bTo bind with tropomyosin.


cTo bind with Ca2+ ions.


dAll of these


View Answer All of these

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


aLengthening of the body.


bShortening of the body.


cWidening of body


dThinning of body


View Answer Thinning of body

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