Section 3.1-3.2 Biology 1 Notes :: essays research papers

SECTION 3.1WHERE LIFE HAPPENS1. Living things can be each uni-cellular (one cell) or multi cellular. A bacteria is one type of unicellular.2. Ab turn out 8000 of the smallest bacteria could fit inside one of your red blood cells.3. The longest cells atomic number 18 the thin nerve cells found in large sentient beings and they can be more than a meter long.4. The cell with the greatest volume is an infertile ostrich egg5. A cells shape is cerebrate to its function. For example, a long nerve cell is long and it carries messages from your spine to your toes.The muscular contraction and relaxation of muscle tissue is responsible for the movement in animals.A SMALL NEW WORLD1. In the 1600s people only if knew about organisms they could see with the unaided eye.2. A trio of Dutch eyeglass makers invented the microscope in the late 1500s. It consisted of a tube with lenses ground from rock crystal, and it overstated objects up to 9 times their actual size. 3. In 1665 the British sc ientist Robert Hooke publish a set of drawings illustrating what he had observed with a microscope.4. In the primaeval 1670s Anton van Leeuwenhook, a Dutch fabric-store owner, began to grind lenses as a hobby. He use handheld microscopes to examine materials such as pond water and blood. BIOLOGISTS BUILD A THEORY1. By the 1830s umteen an(prenominal) biologists were using the microscope as their chief investigative tool2. Mathias Schleiden was a botanist, a scientist that studies embeds. He found that plant parts he examined were make out of cells. In 1838 Schleiden made the generalization that all plants are made of cells. 3. Theodor Schwann was analyze and animals. His microscopic investigations of animal parts led him to generalize that all animals were made of cells. 4. In 1858, a German doctor named Rudolf Virchow disputed the idea of willing generation. Virchow reasoned that new plant cells vacate only from existing plant cells, and new plant animal cells arise only fr om existing animal cells.5. The cell theory consists of three principles&61623 Cells are the basic units of all life.&61623 entirely organisms are made of one or more cells.&61623 All cells arise from the existing cells.SEEING SMALLER1. One of the most important tools used by biologists is the microscope.2. Until the 1950s microscopes were light microscopesinstruments that use either sunlight or artificial light to view objects. With the advantage of this it can magnify many microscopic objects while they are alive.