Q. No.The cell membranes are mainly composed of:
1. Phospholipids
2. Proteins
3. Fats
4. Carbohydrates
According to the widely accepted "fluid mosaic model", cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect:
| 1. | Proteins can also undergo flip-flop movements in the lipid bilayer |
| 2. | Many proteins remain completely embedded within the lipid bilayer |
| 3. | Proteins in cell membranes can travel within the lipid bilayer |
| 4. | Proteins can remain confined within certain domains of the membrane |
The main organelle involved in the modification and routing of newly synthesized proteins to their destinations is -
1. Endoplasmic Reticulum
2. Lysosome
3. Mitochondria
4. Chloroplast
Role of microtubules is:
1. To help in cell division
2. Cell membrane formation
3. Respiration
4. Pinocytosis
Difference between eukaryotes and prokaryotes is in:
1. Circular ss DNA in prokaryotes
2. Histone with prokaryotic DNA
3. Operon in eukaryotes
4. Membrane bound organelles in eukaryotes
Flagella of prokaryotic and eukaryotic cells differ in:
| 1. | Location in cell and mode of functioning |
| 2. | Microtubular organization and type of movement |
| 3. | Microtubular organization and function |
| 4. | Type of movement & placement in the cell |
In chloroplasts, chlorophyll is present in the:
1. Inner membrane
2. Thylakoids
3. Stroma
4. Outer membrane
In the fluid mosaic model of a plasma membrane:
| 1. | Upper layer is non-polar and hydrophilic |
| 2. | The polar layer is hydrophobic |
| 3. | Phospholipids form a bimolecular layer in the middle part |
| 4. | Proteins form a middle layer |
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