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 :

Select the correct option :

Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:

In a mitotic cycle, the correct sequence of phases is

1. S, ${\mathrm{G}}_1$, ${\mathrm{G}}_2$, M
2. ${\mathrm{G}}_1$, S, ${\mathrm{G}}_2$, M
3. M, ${\mathrm{G}}_1$, ${\mathrm{G}}_2$, S
4. ${\mathrm{G}}_1$, ${\mathrm{G}}_2$, S, M

During Meiosis I, 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

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 element helps in maintaining the structure of ribosomes?

During non-cyclic photophosphorylation, when electrons are lost from the reaction center at PS II, what is the source which replaces these electrons?