Essays Tagged: "Molecule"

Language of the cell

lex and delicate system: It can be seen that the cell is the stage where everyday functions such as molecule movement, protein synthesis and tissue repair take place. All organelles within the cell ar ... he ability to detect signals from it's environment. The signals are usually in the form of chemical molecules, that the cell has learned to recognize. The cell decodes these molecules into messages, a ...

(6 pages) 214 1 4.3 May/1996

Subjects: Science Essays > Biology

How nutrients get in, and wastes get out.

to glucose, one of the main nutrients needed for cellular respiration to occour. Starch is a large molecule, a polymer of glucose. Dextrin and maltose are intermediate products in the digestion of st ... ack the intermediate products of proteolytic and amylolytic digestion, as well as some smaller food molecules.The pancreatic amylase converts both the raw starch and the cooked starch that was not dig ...

(7 pages) 267 2 4.4 Dec/1996

Subjects: Science Essays > Biology > Human Biology

Bio engineering

ing them elsewhere or puttingthem back into the original organism in different combinations.Most biomolecules exist in low concentrations and as complex, mixedpopulations which it is not possible to w ... innocuouscommensal occupant of the human gut. By inserting a piece of DNA of interestinto a vector molecule, a molecule with a bacterial origin of replication, whenthe whole recombinant construction ...

(2 pages) 94 0 4.3 Jan/1996

Subjects: Science Essays > Biotechnology

Science: Biology: DNA

----The "thread of life", is deoxyribonucleic acid, otherwise known as DNA. It is the spiral shaped molecule found in the nucleus of cells. Scientists have known since 1952 that DNA is the basic subst ... d is able to repair damage to itself. DNA can be manipulated to change all kinds of things. All DNA molecules consist of a linked series of unites called nucleotides. Each DNA nucleotide is composed o ...

(3 pages) 141 1 4.3 Apr/2002

Subjects: Science Essays > Genetics & Genome Projects

research paper on marijuana

Article 1: "Effects: More than just Munchies" The New York Times, January 29, 20021)A molecule known as endogenous cannabinoids (or endocannabinoids), which is very similar, in shape and ... Doctors are not sure of how the hippocampus uses the endocannabinoids, but they suspect that these molecules strengthen the connections between nerve cells, thus, strengthening memory abilities.5)Whe ... ause it is the only connection to drug-using teens.At certain situations, the human body produces a molecule called endogenous cannabinoids to regulate many processes in the body. This molecule is ver ...

(5 pages) 306 1 3.1 May/2002

Subjects: Humanities Essays > Health & Medicine > Drugs

Biotech

ing them elsewhere or puttingthem back into the original organism in different combinations.Most biomolecules exist in low concentrations and as complex, mixedpopulations which it is not possible to w ... innocuouscommensal occupant of the human gut. By inserting a piece of DNA of interestinto a vector molecule, a molecule with a bacterial origin of replication, whenthe whole recombinant construction ...

(2 pages) 45 0 4.0 Jan/1996

Subjects: Science Essays > Biotechnology

Excretion and Elimination of

plasma is forced through these pores by hydrostatic pressure. The only things that determines if a molecule will pass through the pores of the glomerulus is it's molecular weight. The lower the molec ... olecular weight, the easier it will pass through the pores. Another determining factor will be if a molecule is bound to a large molecule. If this is true then passage through the pores will be hinder ...

(4 pages) 39 0 4.5 Jan/1997

Subjects: Science Essays > Biology

Independent Study Assignment Chemistry (SCHOA1)

y countless ways to make a diversity of products. Carbon atoms form the skeleton of the hydrocarbon molecule, and may be arranged in chains (aliphatic) or rings (cyclic). There are three principal typ ... ns are highly reactive. Acetylenes are also unsaturated and contain at least one triple bond in the molecule.Saturated Hydrocarbons:The number of hydrogen atoms associated with a given skeleton of car ...

(6 pages) 130 0 4.2 Jan/2003

Subjects: Science Essays > Chemistry

The Biochemitry of Human Energy systems

llular levels processes used to produce Adenosine Triphosphate (ATP) figure 1. This is an adenosine molecule linked to three high-energy phosphates that acts as an energy store for the cell. The energ ... reaction in which Creatine Phosphate is degraded to Creatine to provide ATP; net profit of one ATP molecule; can proceed anaerobically.Net reaction:CrP + ADP+H+--->ATP + CreatineDetail:During high ...

(12 pages) 165 0 4.7 Feb/2003

Subjects: Science Essays > Biochemistry

Huntington's Disease

e it and another 60,000 or so will carry the defective gene and that binds itself to the Huntington molecule only in the brain. Both conclude that Huntington Disease is a mutation that causes damage t ...

(2 pages) 58 0 5.0 Mar/2003

Subjects: Humanities Essays > Health & Medicine

Enzymatic Activity.

f fruits and vegetables is the reaction of catecholase when exposed to oxygen (Helms). The reacting molecule in an enzymatic reaction is called a substrate. Another purpose of this experiment is to de ... nd starch is turned into the product by the enzyme, the chances of the enzyme encountering a starch molecule becomes less and so the reaction rate decreases. Most starch is converted at the initial st ...

(6 pages) 172 1 3.0 Apr/2003

Subjects: Science Essays > Biology

Lab report on enzyme activity.

s converted to its product by catalytic action of the enzyme. There is an active site of the enzyme molecule which is a restricted region that actually attaches to the substrate. Usually the active si ... o its product, the product is released and the enzymes active site is ready and waiting for another molecule of substrate.Amylase is an enzyme in human saliva and in other organisms and its substrate ...

(4 pages) 563 0 4.6 Apr/2003

Subjects: Science Essays > Biology

Varying rates of hydrolysis of the different isomers of Carbon, Hydrogen and Bromobutane.

ic theory of gases. The theory implies that in a reaction between two gaseous substances A and B, a molecule of A must collide with a molecule of B before a reaction can occur. It has been shown that ... actions in the gas phase, but it has been found to apply to reactions in solution. Although solvent molecules prevent molecules of reactant coming together as frequently as they would in the gas phase ...

(4 pages) 41 1 3.5 Apr/2003

Subjects: Science Essays > Chemistry

Describing how Hydrogen Bonding is done.

m other uses from the word "bond", since it is a force of attraction between a hydrogen atom in one molecule and a small atom of high electronegativity in another molecule. This means that it is an in ... he less concentration. If the hydrogen is close to another oxygen, fluorine, of nitrogen in another molecule, then there is a force of attraction called a dipole-dipole interaction. This attraction or ...

(1 pages) 31 0 3.0 May/2003

Subjects: Science Essays > Chemistry

Can life exist without enzymes?

ydrogen. Each enzyme has a specific 3-dimensional configuration, and an active site specific to the molecule it binds to. The active site is made up of a unique sequence of R groups, with different sh ... into a polypeptide. In translation, another enzyme called aminoacyl-tRNA synthetase binds the tRNA molecule and its corresponding amino acid together. The complex then reacts with many such subunits ...

(8 pages) 91 0 4.0 Jun/2003

Subjects: Science Essays > Biology

How Amylase Digests Starch.

reactions without being changed themselves. Digestive enzymes speed up the breakdown of large food molecules into smaller ones so that the blood can absorb them. Enzymes turn a large starch molecule ... that the blood can absorb them. Enzymes turn a large starch molecule into thousands of tiny glucose molecules. Enzymes end in 'ase'. There are thousands of enzymes in our body but each enzyme is only ...

(3 pages) 39 0 0.0 Jul/2003

Subjects: Science Essays > Biology

The Ozone Layer.

ntrated in a layer in the stratosphere, about 15-30 kilometers above the Earth's surface.Ozone is a molecule containing three oxygen atoms. It is blue in color and has a strong odor. Normal oxygen, wh ... is colorless and odorless. Ozone is much less common than normal oxygen. Out of each 10 million air molecules, about 2 million are normal oxygen, but only 3 are ozone.However, even the small amount of ...

(4 pages) 56 0 1.0 Jul/2003

Subjects: Science Essays > Environmental Science

What is cholesterol?

ile cholesterol has a bad reputation for clogging up arteries and causing heart disease, this fatty molecule is an essential part of all cell membranes. Scientists have now found to their surprise tha ... sk of heart disease.Both cholesterol and triglycerides are carried through the bloodstream in large molecules called lipoproteins. There are two chief types of cholesterol-carrying lipoproteins, low-d ...

(7 pages) 100 0 3.0 Sep/2003

Subjects: Science Essays > Biology

The Benefits of Yoga.

ses relaxes the muscles, relieves tension, and adds increased flexibility. In addition to releasing molecule-damaging free radicals from the lungs, the deep breathing techniques used in yoga increase ...

(2 pages) 105 1 5.0 Sep/2003

Subjects: Humanities Essays > Health & Medicine > Health & Fitness

The smallpox virus.

ult.Now I will describe the structure and progression of the virus. The virus consisted of a single molecule of a double-stranded DNA. There is a twelve-day incubation period in which the virus reprod ...

(2 pages) 28 0 3.0 Nov/2003

Subjects: Humanities Essays > Health & Medicine > Diseases