General Science Info: 2011

DNA

Deoxyribo nucleic acid or DNA is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms (with the exception of RNA viruses). The main role of DNA molecules is the long-term storage of information. DNA is often compared to a set of...

What is Mutation

Mutations are changes in a genomic sequence : The DNA sequence of a cell's genome or the DNA or RNA sequence of a virus. Mutations are caused by radiation, viruses, transposons and mutagenic chemicals, as well as errors that occur during meiosis or DNA replication. They can also be induced by the...

Carcinoma

A carcinoma is any malignant cancer that arises from epithelial cells. Carcinomas invade surrounding tissues and organs and may metastasize, or spread, to lymph nodes and other sites. ”Carcinoma in situ” (CIS) is a pre-malignant condition, in which...

Thymine

Thymine is one of the four nucleobases in the nucleic acid of DNA that are represented by the letters G–C–A–T. The others are adenine, guanine, and cytosine. Thymine (T) almost always pairs with adenine, although thymine dimers also occur due to UV light exposure. This mutation is responsible for melanoma...

Worms

Worms are invertebrate species that are not footed. There are worms that live in the land and water while others are parasites that live inside the animal’s body. There are over 55,000 species of worms. Four main groups are tapeworms, flatworms, gilik worms and roundworms. Worms are simple structures...

Gene Therapy

Gene therapy is a technique that introduces an altered gene into a person’s body to carry out the work of a mulfunctioning gene. The procedure aims to treat or cure diseases that have been caused by faulty genes. There are more than 4000 genetic disorders, and that number is likely to increase as we...

Lymph System

Lymph system is a system of transport lymph fluid from tissues into the blood. The system also contains cells that make the body able to ward off disease. When blood flow throughout the circulatory system, a liquid substance called lymph seeps through...

Chromatin

Chromatin is that portion of the cell nucleus which contains all of the DNA of the nucleus in animal or plant cells. (A small amount of special DNA is also found in the mitochondria of the cell cytoplasm outside of the cell nucleus.) DNA is never found as a naked molecule in animal or plant cell nuclei....

Flowering Plant

Flowering plant or Angiospermae is most successful plant. Angiospermae reproduce by seed that grows inside the flower ovary. Angiospermae derived from the Greek word which means seed enclosed. Growth angiospermae embryo enclosed in a special structure called a seed inside the flower. After the fertilization...

Ovulation Sign

To determine when you are likely to ovulate – you determine when your next period is due and count back 12 to 16 days. This gives you a the number of days when a woman most likely begins ovulating. Using an ovulation calendar or ovulation predictor...

Ovulation Spotting

Some women who are trying to get pregnant are lucky, in some ways. They have a regular cycle of exactly 28 (or maybe 25, or maybe 30) days, and so they can easily enough predict when they’re ovulating. Other women never really know when they’re going to be fertile because their cycle is irregular, and...

Bacteria

Bacteria are single-celled microorganisms which their structure is simpler than the cells making up the bodies of animals and plants. Bacteria can be found in every place. The bacteria breed in soil, air, even in our digestive system. Most of the types of bacteria that are not classified as dangerous...

Gene Expression

In genetics gene expression is the most fundamental level at which genotype gives rise to the phenotype. The genetic code is “interpreted” by gene expression, and the properties of the expression products give rise to the organism’s phenotype. Gene expression is the process by which information from...

Causes of Dehydration

The immediate causes of dehydration include not enough water, too much water loss, or some combination of the two. Sometimes it is not possible to consume enough fluids because we are too busy, lack the facilities or strength to drink, or are in an area without potable water (while hiking or camping,...

What is Chromosomes

A chromosome is an organized structure of DNA and protein that is found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions. The word...

What is a Gene?

A gene is a unit of heredity in a living organism. It normally resides on a stretch of DNA that codes for a type of protein or for an RNA chain that has a function in the organism. All living things depend on genes, as they specify all proteins and functional RNA chains. Genes hold the information...

What is Human Genetics?

Human genetics is defined as the study of how genetic inheritance takes place in the human species, or how inheritance of various characteristics from parents to kids takes place. The process of genetic inheritance in human beings and the study of human heredity now hold a central position in the field...

What is Genetics

Genetics is the study of heredity, the process in which a parent passes certain genes onto their children. A person's appearance -- height, hair color, skin color, and eye color -- are determined by genes. Other characteristics affected by heredity. alternative name of genetics is Homozygous, Inheritance,...

Genetics Definition

Genetics is the study of heredity, the process in which a parent passes certain genes onto their children. A person's appearance -- height, hair color, skin color, and eye color -- are determined by genes. Other characteristics affected by heredity: - Likelihood of getting certain diseases - Mental...

What is RNA?

RNA is transcribed from DNA by enzymes called RNA polymerases and is generally further processed by other enzymes. RNA is central to protein synthesis. Here, a type of RNA called messenger RNA carries information from DNA to structures called ribosomes. These ribosomes are made from proteins and ribosomal...

General Science Info

DNA