Biology :: essays research papers

Biology   Ã‚  Ã‚  Ã‚  Ã‚  1. The virus is made up of five parts and is in the size range of 10 nm-300 nm in diameter. The first is the coat made up of protein that protects the virus to a point. Next is the head that contains the genetic material for the virus. The genetic material for a virus is DNA. The two other parts are the tail sheath and the tail fibers that are used for odd jobs. I believe that a virus is not considered to be a living creature due to the fact it is a parasitic reproducer. To me it is just like ripping up a piece of paper because it is still the same thing and it isn't carrying out any other function besides reproduction. Since the virus cannot continue to do its functions without taking from a host and being a parasite it is considered an obligated parasite.   Ã‚  Ã‚  Ã‚  Ã‚  2. The adult fern plant in its dominate generation (sporophyte) develops sporangium on one side of its leaf. When meiosis is finished inside the sporangia and the spores are completed the annulus dries out releasing the spores. The spore germinates and grows into a prothallus which is the gametophyte generation. The antheridia and the archegonia are developed on the bottom of the prothallus. The archegonia are at the notch of the prothallus and the antheridia are located near the tip. Fertilization occurs when outside moisture is present and the sperm from the antheridia swim to the eggs of the archegonia. A zygote is formed on the prothallus and a new sporophyte grows.   Ã‚  Ã‚  Ã‚  Ã‚  4. Flowering plants have unique characteristics that help them survive. One is the flower itself that contains the reproductive structures. The color of the flower helps because it may attract birds and insects that spread the plants pollen which diversify the later generation of plants. Flowers also produce fruits that protect their seeds and disperses them with the help of fruit eating animals.   Ã‚  Ã‚  Ã‚  Ã‚  5. Fungi, Animalia, and, Plantae are all believed to be evolved from Protista. All 3 of these kingdoms are eukaryotic and their cells have a nucleus and all the other organelles. Fungi live on organic material they digest, Plants produce their own organic material, and Animals go out and find their food. Animalia are heterotrophic whereas Plantae are photosynthetic. Fungi who digest their own food on the outside are different from animals who digest their food on the inside. Plants and animals both have organs systems but animals have organized muscle fibers and plants do not.   Ã‚  Ã‚  Ã‚  Ã‚  8. The Gasreopoda , Pelecypoda, and the Cephalapoda all have three of