Multiple Choice QuestionsDuring DNA replication in prokaryotes DNA is anchored to
chromosome
mesosome
nucleolus
ribosome
The mineral present in cell wall is
Na
Ca
K
Mg
B.
Ca
The main components of cell wall are:-
1. Matrix- It consists of water (60%), hemicellulose (5-15%), pectic substances (2-8%), lipids (0.5- 3.0%) and proteins (1-2%).
2. Microfibrils- Cellulose or fungus cellulose (10-15%).
3. Other ingredients- Lignin, cutin, suberin, silica, minerals (Fe, Ca, Carbonate), waxes, tannins etc.
Calcium (Ca2+) ions are used as cations to balance anions in the plant vacuole. It helps in maintaining the chemical balance in the soil that reduces soil salinity and improves water penetration.
Cell 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
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
Switch
