Identify the statement which is incorrect.
1. | Sulphur is an integral part of cysteine. |
2. | Glycine is an example of lipids. |
3. | Lecithin contains a phosphorus atom in its structure. |
4. | Tyrosine possesses an aromatic ring in its structure. |
Match the following:
Column I | Column II | ||
(a) | Aquaporin | (i) | Amide |
(b) | Asparagine | (ii) | Polysaccharide |
(c) | Abscisic acid | (iii) | Polypeptide |
(d) | Chitin | (iv) | Carotenoids |
Options: | (a) | (b) | (c) | (d) |
1. | (iii) | (i) | (iv) | (ii) |
2. | (ii) | (iii) | (iv) | (i) |
3. | (ii) | (i) | (iv) | (iii) |
4. | (iii) | (i) | (ii) | (iv) |
Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:
1. | Anaphase | 2. | Telophase |
3. | Prophase | 4. | Metaphase |
In a mitotic cycle, the correct sequence of phases is
1. S, , , M
2. , S, , M
3. M, , , S
4. , , S, M
During Meiosis 1, in which stage synapsis takes place?
1. | Pachytene | 2. | Zygotene |
3. | Diplotene | 4. | Leptotene |
Match the following events that occur in their respective phases of cell cycle and select the correct option:
Column I | Column II | ||
(a) | G1 phase | (i) | Cell grows and organelle duplication |
(b) | S phase | (ii) | DNA replication and chromosome duplication |
(c) | G2 phase | (iii) | Cytoplasmic growth |
(d) | Metaphase in M-phase | (iv) | Alignment of chromosomes |
Options: | (a) | (b) | (c) | (d) |
1. | (ii) | (iii) | (iv) | (i) |
2. | (iii) | (iv) | (i) | (ii) |
3. | (iv) | (i) | (ii) | (iii) |
4. | (iii) | (ii) | (i) | (iv) |
What happens to the mass number and the atomic number of an element when it emits \(\gamma\text{-}\)radiation?
1. | mass number decreases by four and atomic number decreases by two. |
2. | mass number and atomic number remain unchanged. |
3. | mass number remains unchanged while the atomic number decreases by one. |
4. | mass number increases by four and the atomic number increases by two. |
Select the incorrect statement.
1. | Transport of molecules in phloem can be bidirectional. |
2. | The movement of minerals in the xylem is unidirectional. |
3. | Unloading of sucrose at the sink does not involve the utilization of ATP. |
4. | Elements most easily mobilized in plants from one region to another are phosphorus, sulfur, nitrogen, and potassium. |
In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:
1. Ammonia
2. Glutamate
3. Nitrates
4. Ureides
Which of the following elements helps in maintaining the structure of ribosomes?
1. Magnesium
2. Zinc
3. Copper
4. Molybdenum