Vitamin E (Tocopherol) is a fat-soluble vitamin that acts primarily as a powerful antioxidant. It protects cell membranes from oxidative damage by neutralizing free radicals, which are unstable molecules that can damage cells. It also supports immune function and has anti-inflammatory properties. Deficiency is rare but can cause neurological problems and hemolytic anemia.
Explanation:
Cones are photoreceptor cells in the retina responsible for photopic (daylight) vision and color perception. There are three types of cones sensitive to blue, green, and red wavelengths. Rods are responsible for scotopic (dim light) vision and do not detect color. The cornea and lens focus light onto the retina.
Explanation:
Restriction enzymes (restriction endonucleases) are molecular 'scissors' that cut DNA at specific, highly specific recognition sequences (palindromic sequences). They are essential tools in genetic engineering for cutting both the source DNA (gene of interest) and the vector DNA at specific sites, creating compatible ends for ligation. DNA ligase is used to join the fragments.
Explanation:
Amphioxus (Branchiostoma) is a cephalochordate that retains the notochord, dorsal nerve cord, and pharyngeal slits throughout its life. In vertebrates, the notochord is largely replaced by the vertebral column during development. Amphioxus is a key model for studying vertebrate origins.
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