Assertion (A): | The nucleus is the control centre of the cell and contains the genetic material (DNA). |
Reason (R): | The nucleus directs protein synthesis through messenger RNA (mRNA) molecules. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
I: | Middle lamella is made up of calcium pectate. |
II: | Primary wall is capable of growth. |
III: | Secondary wall is formed on the inner [towards membrane] side of the cell. |
1. | Mesosomes help in DNA replication and distribution to daughter cells. |
2. | Gram staining is based on the difference in the composition of cell wall of different bacteria. |
3. | The axonemal microtubular arrangement in prokaryotes is characterized as 9 + 2. |
4. | Plasmids are extrachromosomal circular double stranded DNA molecules. |
1. | It synthesizes proteins that regulate cellular functions. |
2. | It selectively allows substances to enter and exit the cell, maintaining the internal environment. |
3. | It provides structural support to maintain the shape and integrity of the cell. |
4. | It stores genetic material and coordinates cell division. |
Column I | Column II | ||
1. | Chloroplast | A. | Protein synthesis |
2. | Peroxisome | B. | Photosynthesis |
3. | Nucleolus | C. | Detoxification |
4. | Centrosome | D. | Cell division |
I. | All living organisms are composed of cells. |
II. | The cell is the basic unit of life. |
III. | All cells come from pre-existing cells through sexual reproduction. |
Column I | Column II | ||
A | Lysosomes | P | Membrane bound organelle formed by growth and division from pre-existing organelles and/or by de novo synthesis and further maturation from the ER. |
B | Peroxisome | Q | Oxidative phosphorylation |
C | Mitochondria | R | membrane bound vesicular structures formed by the process of packaging in the Golgi apparatus |
D | Chloroplasts | S | Photophosphorylation |
A | B | C | D | |
1. | P | R | S | Q |
2. | P | R | Q | S |
3. | R | P | S | Q |
4. | R | P | Q | S |
Statement I: | Larger and more numerous nucleoli are present in cells actively carrying out lipid synthesis. |
Statement II: | RER is frequently observed in the cells actively involved in protein synthesis and secretion. |
I: | All cells have a true nucleus. |
II: | There is a cell membrane around all living cells. |
III: | All cells have a cell wall. |
IV: | The cell membrane controls what the cell will look like and how it behaves. |
V: | The nucleus controls what passes into and out of a cell. |