When light energy hits the retina, the retinal changes from a to a configuration?

When light energy hits the retina, the retinal changes from a cis to a trans configuration.

Explanation:

The retina contains an essential chromoprotein, rhodopsin, that is very crucial in turning a light signal to an electric signal. The rhodopsin comprises of 11-cis-retinaldehyde that gets transferred into all-trans-retinaldehyde as soon as light hits the retina. This change in configuration generates electrical signals that are further travelled by the optic nerve of the eye.

Also, this change in configuration of rhodopsin, causes bleaching due to which vision is created.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.