Multiple Choice QuestionsCell membrane in animals is composed mainly of the molecule of
lipids
proteins
lipids and proteins
carbohydrates
A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution?
Yellow
Green
Blue
Red
C.
Blue
Resolving Power or resolution is the ability of the lens to distinguish fine details and structure. It is the ability of a lens to differentiate between two points at a specified distance apart.
Resolving Power =
It depends upon 2 factors:
(i) Wavelength of light used for illumination
(ii) Power of objective lenses
Among Yellow, green, red and blue light; Blue colour has the shortest wavelength so, it will give best resolution.
Which one is single membrane cell organelle
Endoplasmic reticulam
Mitochondria
Lysosomes
Chloroplast
Centromere is required for
transcription
crossing over
cytoplasmic cleavage
movement of chromosomes towards poles
Protein synthesis in an animal cell occurs
only on the ribosomes present in cytosol
on ribosomes present in cytoplasm as well as in mitochondria
only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
on ribosomes present in the nucleolus as well as in cytoplasm
The main organelle involved in modification and routing of newly synthesized proteins to their destinations is
mitochondria
endoplasmic reticulum
lysosome
chloroplast
Arachidonic acid is
non-essential fatty acid
essential fatty acid
poly unsaturated fatty acid
both 'b' and 'c'
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