Biology Essays Examples For College & High School Students in PDF

10822 total results

An Overview of the Process of DNA Transcription and DNA Replication (215 words, 1 pages)

State where cells arise from All cells arise from the division of other cells Describe the cell cycle The cell cycle is an alternation between interphase and mitosis Define interphase Interphase is an active period in the life of a cell, where many biochemicalreactions, DNA transcription, and DNA replication occur. ... Read More

Understanding the Concept Behind the Equation y = mx + c (431 words, 3 pages)

When you are asked to sketch a curve, you need be able to draw a quick sketch of the curve, showing the main details (such as where the curve crosses the axes). You should be able to quickly sketch straight-line graphs, from your knowledge that in the equation y mx ... Read More

A Look at the Varying Proportions of Biological Material in Most Beaches (454 words, 2 pages)

Most beaches of composed of rock breakdown with varying proportions ofbiological material usually shell fragments. However if its an accumulation ofmaterial at the high tide mark the following may be included 1) Canada-timber beach 2) USA-tin can beach A beach may be a store in a bayor a mobile stream ... Read More

The Change in Internal Energy of a Gas Through the Equation U = Q + W (292 words, 2 pages)

The change in internal energy of a gas is equal to the energy transferred toit plus the owrk done on it. U Q Wchange in internal energy change in heat transferred to it work done onitThe internal energy of a gas only depends on its temperature. To change thetemperature of ... Read More

Alpha Particles, Beta Particles, Gamma Rays (221 words, 2 pages)

Alpha particles consists of 2 protons and 2 neutrons (Helium nucleus)highly ionizing therefore they strongly attract electronshave a charge of 2bent by electric and magnetic fields but not as much as beta due to largermassrelatively heavy and slow movingabsorbed by skin 5cm air card therefore it has poor penetrating power ... Read More

Conductive Materials (366 words, 2 pages)

Conduction In metals, the dominant method of conduction is through the movement ofelectrons. This method of conduction does not operate in non-metals becausethere are no free electrons (other than graphite). When a metal is heated, theelectrons closest to the heat source vibrate more rapidly. Electrons thencollide with these atoms and ... Read More

An Overview of the Melting Points of Materials in Chemistry (386 words, 3 pages)

Thanks to Doc Brown of ChemHelp.Net for these great chemistry revision notes. Check out his site for more! (a) High Melting Point and Boiling Point The bonding between the atoms in transition metals is very strong. The strongattractive force between the atoms is only weakened at high temperatures, hencethe high ... Read More

An Overview of the Definitions in Behavior of What and When we Seek Something (401 words, 2 pages)

Definitions used in behaviour Causation When we seekto explain a patter of behaviour in terms of events that immediately precede it.eg. A driver stops after seeing a red light. The man stopping is animmediate response to the red light (the stimulus). Ontogeny When we seekto explain behaviour in terms of ... Read More

An Overview of the Circulation in Plants’ Properties (360 words, 2 pages)

Circulation inplants There are two types of vessels in plants- Xylem -- These vesselstake water and mineral ions from the roots to the stem and theleaves.Phloem -- takes iorganic substances and sugars fromthe leaves to the parts of the leaves that require them eg. the flowers, fruitsand roots. Xylem travels ... Read More

An Analysis of the Two Types of Circulatory Systems in Animal Species (857 words, 4 pages)

There are two types of circulatory systemsin animals 1. Open systems and 2. Closed systems 1. Open systems --- Theorganscells are bathed in the blood. (eg. in insects such aslocusts)2. Closed systems --- The organscells are providedwith blood via vessels. (eg. in mammals such as kangaroos ) Closed Systems- Single ... Read More

The Description of the Subsistence Method of Growing Crops, Horticulture (322 words, 3 pages)

Horticulture- a method of subsistence based on growing cropswith simple tools and technologies Slash burn- a form of horticulture in which a plot ofland is cultivated for some years and then is cut, left to dryand then burned, providing a little fertilisation and clears theplot of weeds. It is returned ... Read More

The Various Fieldwork Processes in Quantitative Research (237 words, 2 pages)

Fieldwork- Working on gathering information, data, researchetc. on a certain people. Research methods Quantitative (give number andor yes andno answers) Surveys- a broad overview of particular subjects Sampling- investigating a small part of a largerwhole Advantages Disadvantages Easier to analyse Analysis of a lot ofdata General Too general Covers a ... Read More

An Analysis of the Transcription in Prokaryote and an Analysis of the Blood Patterns (713 words, 4 pages)

Transcription in Prokaryotes A transcription unit comprises the DNA between a promoter, wheretranscription initiates, and a terminator, where it ends. One strand of the DNA in the region servesas a template for the synthesis of a complementary strand of RNA. The RNA-DNA hybrid is very short (2-3 bp)and transient, as ... Read More

An Introduction to the Analysis of the Waves (744 words, 4 pages)

Total internalreflection Wavesgoing from a slower to a faster medium speed up and bend at theboundary, e.g. light going from glass to air. Beyond a certain angle (the criticalangle) all the waves bounce back into the glass - they are totallyinternally reflected. All waves that hit the surface beyond this ... Read More

An Introduction to Wavelength: The Bombardment of Targets of Heavy Atoms by Fast Moving Electrons (340 words, 2 pages)

Wavelength 10-11m to 10-9m Sources The bombardment of targets of heavy atoms (typically tungsten) by fastmoving electrons causes energy levels in the target to change. When the targetatoms' excited electrons drop back to their original level, they release fixedquanta of electromagnetic energy. (This is called the photoelectric effect).Basically, X-rays are ... Read More

An Overview of the Wavelength Concept of Gamma Rays (334 words, 2 pages)

Wavelength 10-11m Sources Gamma rays are emitted from the nuclei of radioactive atoms during decay.Radioactive decay is spontaneous. This can occur when a neutron splits into anelectron and a proton. K-capture also releases gamma radiation. K-captureis the capture of the inner most electron, combined with one of the nucleus'protons, to ... Read More

An Analysis of the Kinetic Theory Concept and the Solids (352 words, 2 pages)

Kinetic Theory All matter is made up of particles which are in constant motion. Solids Fixed shape and volume Particles are held together by relatively strongforces, and are incompressible Particles do not have free movement, but canvibrate about fixed positions An increase in temperature will give the particlesmore energy, the ... Read More

An Introduction to the Ways the Sun Creates Energy (669 words, 5 pages)

How the sun creates energy Solar energy from the sun is created as a result ofnuclear fision in the form of heat and light. This energy is transferred to coal through photosynthesisand compression of biomass over time. The suns energy is transferred to wind because ofthe earths rotation on its ... Read More

An Analysis of the Metal Bonding in Metalurgy (443 words, 3 pages)

Element a substance which cannot be broken downinto two or more substances by any means. Only contains one type of atom. Compound a substance in which atoms of two ormore elements have been chemically combined. IonicBonding Metals bonding with non-metals Involves transfer of electrons from metal tonon-metal, so that both ... Read More

An Introduction to the B-Cells Produced in the Bone Marrow That Are Distributed through the Body in the Lymph Nodes (927 words, 5 pages)

B-cells are produced in the bonemarrow and are distributed through the body in the lymph nodes. B-cells respond to the foreign antigens ofa pathogen by producing specific antibodies.Antibodies are complex proteins that are released into the blood andcarried to the site of infection.B-cells do not fight pathogens directly. An antibody, ... Read More

An Introduction to the Analysis of the Structure of the Atom (909 words, 6 pages)

An atom is the smallest possibleparticle of an element that can exist Structure of the Atom The atom consists of a tiny, massive centralnucleus surrounded by electrons. Particle Relative Charge Relative Mass Proton 1 1 Neutron 0 1 Electron 1 0 (11840) The Nucleus Contains the protons and neutrons. It ... Read More

An Introduction to the Substance That Dissolves in Water and Forms an Aqueous Solution Which May Be Acidic, Alkaline or Neutral: Metal Oxides (627 words, 4 pages)

When a substance dissolves in water, it forms anaqueous solution, which may be acidic, alkaline or neutral. Metal oxidesdissolve to form alkaline solutions. Non-metal oxidesdissolve to form acidic solutions. The pH scale is used to show how acidic oralkaline a substance is. It runs from 0 (being highly acidic) to ... Read More

An Introduction to the Analysis of the Period of the Ice Age (643 words, 3 pages)

Many thanks to Peter Every 200-250 million years, climatic activity leads to falls in temperature of over 5 degrees centigrade. These periods of great ice activity are known as Ice Ages.The most recent is the Pleistocene period of the Quaternary era, which began 2 million years ago. The earth only ... Read More

An Introduction to the Issue of Chemical Weathering (287 words, 2 pages)

Many thanks to PeterLIWeathering is the breaking and decomposition of rocks atnear the earth's surface by physical chemical processes.There are two main types of weathering Chemical Weathering This involves the decomposition of rocks due to chemical reactions between rock minerals, water and some atmospheric gases such as oxygen and carbon ... Read More

An Introduction to the Vulcanicity the Process through Which Gases and Molten Rock Are Extruded on the Earth’s Surface (381 words, 2 pages)

Many thanks to PeterVulcanicity is the process through which gases and molten rock are either extruded on the earth's surface or intruded into the earth's crust.Magma is the molten rock originating from the upper plastic layer of the mantle. When it gets to the surface and loses its gases, it ... Read More

An Introduction to the Different Ways to Measure Radiation (684 words, 1 pages)

Measuring radiation F.5.1 The longer the period of light variation of a Cepheid, the greater is the luminosity. Observing the luminosity and the period the absolute magnitude can be determined. Comparing the absolute luminosity to the apparent luminosity we can calculate the distance to the Cepheid and surrounding stars. They ... Read More

Amazing Facts About Heavenly Bodies (1952 words, 3 pages)

Measuring stellar radiation F.1.1 Galaxies -- giant assemblies of stars, gas, and dust held together by the gravitational forces they have on each other. Our Galaxy is called the Milky Way. Clusters -- gravitationally bound system of galaxiesstars. Constellations -- group of galaxiesstars given a specific name. The 12 zodiacs ... Read More

An Introduction to the Entropy Concept (949 words, 4 pages)

E.5 The entropy concept E.5.1 Carnot first developed the concept of entropy in his work on heat engines...by building a theoretical model of an engine which achieved 100 efficiency, he was, in fact, assuming that entropy could be made constant, as everything in this model was being done reversibly. Clausius ... Read More

An Introduction to the Various Models of the Universe: Aristotle (1898 words, 9 pages)

E.1 Models of the universe E.1.1 Aristotle's model of the universe -- The universe was finite, spherical and above it was heaven or whatever. Everything was divided into 4 elements...earth, water, air and fire (the fire being the sun). Everything below the orbit of the moon was the earth, everything ... Read More

An Introduction to the Analysis of the Ray Optics (2080 words, 9 pages)

H.6 Ray Optics H.6.1 Circular mirrors do not focus all their light to a single point (that's what parabolas do). Close to the center, the shape of a circle and a parabola (on it's side) are very similar, and so paraxial rays (close to the center) will be focused to ... Read More

Biology Essay Examples