Assignment One Completed and MARKED - Biology 204...

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Biology 204 Principles of Biology I Alexandra Spina Assignment 1A Definition/Comparison Questions eye / eyespot- The eyespot differs from the eye in some very clear complex ways. The eyespot is used as a sensory mechanism to sense the light direction and light intensity to harvest energy and not for seeing images like the eye. The eyespot triggers a change in flagellar movement through a simple signal transduction response. Eyespots can be found in simple organisms such as the green agla Chlamydomonas reinhardtii, where the eyespots serves to sense the light direction and the light intensity for the alga. The eye on the other hand, is a very complex organism that is used by many organisms ( multicellular animals ) to sense light, create imagines, and see the world around them. Darwin’s theory of evolution predicted that it would have taken 2000 small improvements to yield the camera- type eye over time. The eye contains photoreceptors but also requires a brain or simple nervous system to interpret and respond to the information. The eye is composed of: optic nerve, retina, vitreous humour, iris cornea, aqueous humour, lens. What identifies the eye from the eyespot is vision, the eye is capable of vision, whereas the eyespot can only sense light. eyes are sensory organs of multicellular animals eyes are multicellular, more complex, to a degree that requires a brain to process the information from the eyes ocelli as the simplest types e.g. in Planaria
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compound eyes, composed of ommatidia in insects complex camera eyes with retina and cornea 3 / 4 UV radiation / light - Light referrers to the electromagnetic spectrum, light can also be referred to as visible light. What distinctly makes light stand out from the rest of the spectrum is that this small portion of the spectrum humans and vertebra animals can see with the eye. Light is found after ultra-violet light and before infrared light on the electromagnetic spectrum; the wavelength of visible light on the spectrum is 400nm which is blue light to about 700 nm which is the red light. Light also can be found acting like a stream of particles even though it is described as a wave. Ultra- violet light opposed to visible light is a form of radiation which is not visible to the human eye. The ultra- violet light can be located after x-rays and before light. The ultra- violet light is within the invisible part of the electromagnetic spectrum which spans 10 nm to 400nm, which is shorter than visible light. Unlike light which is absorbed by biological organisms for different processes like creating energy, gathering information and vision, Uv is damaging to molecules and can destroy chemical bonds therefore it is absorbed by the ozone layer. 4 / 4 NADH/ ATP - ATP known as adenosine triphosphate, which is the main agent in reactions such as exogenic endergonic. ATP is the "currency" of the cell. This is a molecule that stores energy. It can be metabolized to ADP in an exothermic reaction, which releases energy. This is how all cells produce energy to perform life functions. The ATP molecule is made up of 5 carbon sugar,
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