#TRANSCRIBE AND TRANSLATE DNA HOW TO#
#TRANSCRIBE AND TRANSLATE DNA CODE#

Note also that the two strands of DNA are held together by hydrogen bonds between complementary bases on the two strands. Consequently, one can think of DNA as an extremely long double-stranded polymer of nucleotides. The backbone of each molecule is composed of alternating sugars (the pentagon with the 'S') and phosphate groups (shown with 'P), and each sugar is also covalently bonded to one of the following nucleotide bases:Ī nucleotide 'unit' (outlined by the red box in the illustration] consists of a sugar molecule, a phosphate, and one of the five. The illustration below shows the structure of both DNA and RNA (ribonucleic acid.) Structure of DNAĭNA is an abbreviation for deoxyribonucleic acid, which is an extremely long polymer made from units called nucleotides. coli has a single circular chromosome (DNA molecule) which is also coiled, supercoiled, and packaged with proteins, but in prokaryotes the chromosome is located in the cytoplasm instead of being contained in a membrane- bound nucleus.

#TRANSCRIBE AND TRANSLATE DNA CODE#

The chromosomes of eukaryotes are contained within the membrane-bound nucleus.īut DNA provides the essential genetic code for all living organisms, including bacteria. Our cells have all 46 chromosomes, but they are coiled around proteins and highly coiled into the form of the chromosomes that are seen to the right. In fact, if we were to take a single human chromosome and stretch it out, it would be about 5 centimeters long (about 2 inches), and all 46 chromosomes would be about 2 meters long if they were stretched out and laid end to end. The illustration below illustrates this by imagining that we have grabbed one end of a chromosome and pulled it out to reveal that it is an extremely long polymer consisting of a double helix. Each chromosome is a single molecule of DNA. One chromosome in each pair is inherited from one's mother and one from one's father.

There are 22 homologous pairs and two sex chromosomes (the X and Y chromosomes). The illustration below shows the 46 chromosomes that contain the human genome. Molecules are generally so small that they can't be seen even with a microscope, but chromosomes can be seen with a microscope under certain circumstance, particularly when a cell is about to divide. In bacteria proteins can be structural and they can be enzymes that perform metabolic functions that can breakdown nutrients that provide energy and provide structural building blocks for growth and replication.Įach chromosome is, if fact, an enormous DNA molecule.

Explain and give examples of natural selection.Īll living organisms have one or more chromosomes that contain the code that directs the synthesis of proteins that are essential for its structure and function.

Explain the contribution of mutations to evolution.

Explain what a mutation is and give examples of how it might occur.

#TRANSCRIBE AND TRANSLATE DNA HOW TO#

Demonstrate how to predict the possible genotypes that could occur in an offspring, provided one knows the genotype of the two parents.Explain the biological basis of Down's Syndrome.Explain how the number of chromosomes changes during male and female gametogenesis and fertilization.Define and explain the significance of 'crossing over' and 'random assortment' during meiosis.Explain how DNA directs protein synthesis and the roles of DNA and proteins in regulating cell function.Explain how DNA encodes genetic information and the role of messenger RNA and transfer RNA.After successfully completing this section, the student will be able to:

Transcribe and translate dna