Multiple Choice QuestionsVacuole in a plant cell
is membrane-bound and contains storage
is membrane-bound and contains water and excretory substances
lacks membrane and contains air
lacks membrane and contains air
The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?
Deletion of non-essential genes
Super-coiling in nucelosomes
DNAse digestion
DNAse digestion
Which one of the following is not a constituent of cell membrane?
Cholesterol
Glycolipids
Proline
Proline
During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change?
First negative, then positive and again back to negative.
First positive, then negative and continue to be negative
First negative, then positive and continue to be positive
First negative, then positive and continue to be positive
Select the wrong statement from the following:
Both chloroplasts and mitochondria contain an inner and an outer membrane
Both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by teh thylakoid membrane
Both chloroplasts and mitochondria contain DNA
Both chloroplasts and mitochondria contain DNA
If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?
types of pigments present in the cell
nature of stored food materials in the cell
structural organization of thallus
structural organization of thallus
A major breakthrough in the studies of cells came with the development of electron microscope. This is because
the resolution power of the electron microscope is much higher than that of the light microscope
the resolving power of the electron microscope is 200 – 350 nm as compared to 0.1 – 0.2 nm for the light microscope
electron beam can pass through thick materials, whereas light microscopy requires thin sections
electron beam can pass through thick materials, whereas light microscopy requires thin sections
Which 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
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