Explanation
Correct Option: A
Explanation:
Some cells are found without nuclei.
They are called enucleates.
Vessel elements and sieve tube elements, both are enucleated.
The presence of P- protein is a characteristic feature of the sieve tubes.
They appear to be granular or crystalline submicroscopic structures.
In the innermost layer of the cell wall of vessels have a thick secondary cell wall.
Hence, A common structural feature of vessel elements and sieve tubes elements is Enucleated condition.
A. Synaptic vesicle store various neurotransmitters that are released at the synapse.
B. Synaptic knob are the bulbous structures present at the terminal end of an axon.
C. Dendrites, also called dendrons, are branched protoplasmic extensions of a nerve cell that propagate the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project.
D. Schwann cells, also called neurilemma cells are any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons.
So, the correct option is 'B'.
Correct answer: A
The gaps approx. 1 mm wide formed between the two adjacent myelin sheath cells, along the axons are called as the nodes of Ranvier.
Nodes of Ranvier are the uncovered part of axons.
Also they are the periodic gaps in axon that propagate the action potential down an axon.
Hence, the proper answer is 'Axon'.
Eosin is the most common dye to stain the cytoplasm in histology. It is an acidic dye that binds to basic components of a cell, mainly proteins located in the cytoplasm. It gives a bright pink color that contrasts the dark blue nuclear hematoxylin staining Arginine, histidine, and lysine (at both acidic and neutral pH) and tryptophan (at acidic pH) residues of a protein bind electrostatically to carboxylic and phenolic groups of the dye to produce a stable water-soluble protein-dye complex. As Histamine is protein, Eosin and Histamine bind due to electrostatic interaction and gives red color.
So, the correct answer is “Electrostatic interaction”.
So, the statement is false.
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