Answer:
Pupillary light reflex refers to the contraction that the pupils present when they light up. In cases of injury to the optic nerve, when the eye where the injured optic nerve is illuminated, since it cannot conduct the stimulus to the brain, neither pupil closes.
Explanation:
Pupillary light reflex refers to the reaction that causes the pupil to close with light thanks to the contraction of the sphincter of the pupil and to open in the dark thanks to the relaxation of that muscle by not receiving any stimulus. A light stimulus reaches the eye and in the retina it is transformed, through a chemical reaction, into an electrical stimulus that will be transmitted through the optic nerve and the visual pathways to the brain. The visual cells of the retina, rods and cones, also act as light receptors that control the pupil's motor activity. Thus, pupil-motor thresholds to light follow the same spectral sensitivity deviations as visual thresholds, which are a function of the state of light adaptation of the retina.
DNA contains equal amounts of adenine/thymine and guanine/cytosine.
DNA sequencing technique runs through database so it can compares all the sequenced information and finds similarities.
The answer is B) mutation
A mutation is the alteration of a nucleotide
sequence in DNA. <span>Changed DNA sequence is transcribed into
RNA. This changed RNA sequence is
translated into misformed protein.
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Replication is a process in which DNA molecule is copied, and thereby two identical DNA molecules are produced. Transformation is a process of incorporation of the foreign genetic material into cell's genetic material.
