CBSE
Multiple Choice QuestionsPlasmodesmata are
lignified cemented layers between cells
locomotory structures
membranes connecting the nucleus with the plasmalemma
membranes connecting the nucleus with the plasmalemma
The main arean of various types of activities of a cell is
Plasma membrane
mitochondrion
cytoplasm
cytoplasm
The plasma membrane consist mainly of
phospholipids embedded in a protein bilayer
Proteins embedded in a phospholipid bilayer
proteins embedded in a polymer of glucose molecules
proteins embedded in a polymer of glucose molecules
Cytoskeleton is made up of
calcium carbonate granules
callose deposits
cellulosic microfibrils
cellulosic microfibrils
Middle lamella is mainly composed of
hemicellulose
muramic acid
calcium pectate
calcium pectate
An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called
thylakoid
endoplasmic reticulum
plasmalemma
plasmalemma
Given below is a schematic break-up of the phase/stages of cell cycle
Which one of the following is the correct indication of the stage/phase in the cell cycle?
B -Metaphase
C-karyokinesis
D-Synthetic phase
D-Synthetic phase
Identify the components labelled A, B, C and D in the diagram below from the list 1 to 8 given along with
1) Cristae of mitochondria
2) Inner membrane of mitochondria
3) Cytoplasm
4) Smooth endoplasmic reticulum
5) Rough endoplasmic reticulum
6) Mitochondrial matrix
7) cell vacuole
8) Nucleus
|
A |
B |
C |
D |
|
5 |
4 |
8 |
3 |
|
A |
B |
C |
D |
|
1 |
4 |
8 |
6 |
|
A |
B |
C |
D |
|
6 |
5 |
4 |
7 |
|
A |
B |
C |
D |
|
6 |
5 |
4 |
7 |
If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen?
The pancreatic enzymes and specially the trypsin and lipase will not work efficiently
The pH of stomach will fall abruptly
Steapsin will be more effective
Steapsin will be more effective
Select the correct statements out of the four (1-4) given below about lac operon.
Glucose or galactose may bind with the repressor and inactivate it
In the absence of lactose, the repressor binds with the operator region
The z- gene codes for permease
The z- gene codes for permease
