Multiple Choice QuestionsWhich of the following statements regarding cilia is not correct?
The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane
Cilia are hair-like cellular appendages
Microtubules of cilia are composed of tubulin
Microtubules of cilia are composed of tubulin
C.
Microtubules of cilia are composed of tubulin
Cilia are minute, harilike processes on the surface of protozoans or of metazoans cells ehich by their motion accomplish locomotion or produce a current. Each cilium contains a peripheral circle of nine doublet microtubules arranged around two single microtubules. Each microtubule is composed of tubulin proteins.
Although the mechanism of ciliary movement is not completely under stood. It is known that the microtubules behave as sliding filament that move past one another much like the sliding filaments of vertebrate skeletal muscle.
The fluxes of Ca2+ across the membrance is not responsible for controlling the organized beating or cilia.
Cri-du-chat syndrome in humans is caused by the
fertilization of an XX egg by a normal Y-bearing sperm
loss of half of the short arm of chromosome 5
loss of half of the long arm of chromosome 5
loss of half of the long arm of chromosome 5
Which of the following RNAs should be most abundant in animal cell?
r-RNA
t-RNA
m-RNA
m-RNA
Which of the following components provides sticky character to the bacterial cell?
Cell wall
Nuclear membrane
Plasma membrane
Plasma membrane
Statement I Microtubules are formed only in animal cells.
Statement II Microtubules are made up of a protein called myosin.
Choose the correct option
Statement I is correct and statement II is incorrect.
Statement II is correct and statement I is incorrect.
Both statement are correct
Both statements are incorrect
The chromosome in which centromere is situated close to one end are
Metacentric
Acrocentric
Telocentric
Sub-metacentric
Which of the following organelles does not contain RNA?
Plasmalemma
Ribosome
Chromosome
Nucleolus
Which of the following is an epidermal cell containing chloroplast?
Stomata
Hydathode
Guard cell
None of these
Switch
