Essays Tagged: "DNA replication"

HYPERCELL / CELL DIVISION

the reproduction of a pair of two daughter cells that are genetically identical. For this to occur, DNA must be duplicated and its products segregated into the nuclear spaces of the two daughter cells ... and the environment conditions are favorable in the G1 checkpoint (START or Restriction point), the DNA replication machinery is triggered and the control system moves forward. Similarly for the G2 ch ...

(5 pages) 76 0 4.0 Jan/1997

Subjects: Science Essays > Biology

HYPERCELL / CELL DIVISION

the reproduction of a pair of two daughter cells that are genetically identical. For this to occur, DNA must be duplicated and its products segregated into the nuclear spaces of the two daughter cells ... and the environment conditions are favorable in the G1 checkpoint (START or Restriction point), the DNA replication machinery is triggered and the control system moves forward. Similarly for the G2 ch ...

(5 pages) 88 0 4.6 Jan/1997

Subjects: Science Essays > Biology

DNA

DNA are nucleic acids that are made up of long units of called nucleotides. A nucleotide consists of ... f nitrogenous base that particular nucleotide contains. The nitrogenous bases that are contained in DNA are adenine, thymine, guanine, and cytosine. The sugar group that is attached to the sugar-phosp ... hate backbone is deoxyribose. Each nucleotides will link to another corresponding nucleotide in the DNA molecule, A with G, T with C, etc. These linkages form what seem to resemble the rungs of a ladd ...

(5 pages) 204 3 4.8 Feb/2003

Subjects: Science Essays > Genetics & Genome Projects

Mitosis.

ly formed cell synthesizes materials needed for cell growth. In the S stage, deoxyribonucleic acid (DNA), the genetic material of the cell, is replicated. At this stage, DNA consists of long, thin str ... ers a brief stage known as G2, when specialized enzymes correct any errors in the newly synthesized DNA, and proteins involved with the next phase, mitosis, are synthesized.Mitosis occurs in four step ...

(4 pages) 60 0 3.7 Nov/2003

Subjects: Science Essays > Biology

Essay on Replication

cell cycle. Initiator proteins begin the process. The strands are separated by the enzyme helicase. DNA polymerase begins replicating the leading strand in the 5' to 3' direction since DNA is antipara ... re used to help the polymerases code for the right nucleotides and keep the process going smoothly. DNA polymerase later proofs its work afterwards and repair enzymes replace wrongly placed nucleotide ...

(1 pages) 26 0 3.7 Apr/2004

Subjects: Science Essays > Biology

Notes explaining the structure of DNA, replication process of DNA, how mutations work in DNA, and the Polymerase chain reaction process

-DNA is a polymer of nucleotides-Each nucleotide consists of a nitrogenous base, a sugar, and a phosp ... eotides-Each nucleotide consists of a nitrogenous base, a sugar, and a phosphate group-The sugar in DNA is a pentose sugar called deoxyribose-The different kinds of bases are adenine, thymine, guanine ... ugar called deoxyribose-The different kinds of bases are adenine, thymine, guanine, and cytosine-In DNA, there is a 1:1 ratio of nucleotide bases: number of adenine = number of thymine and number of g ...

(3 pages) 63 0 2.0 Feb/2005

Subjects: Science Essays > Genetics & Genome Projects

Study notes for the main scientists that participated in the early discovery of DNA and the early studies about DNA

-Hershey and Chase showed that DNA is the hereditary material of phages-Hershey and Chase labeled protein in a T2 phage with a radi ... es-Hershey and Chase labeled protein in a T2 phage with a radioactive tag -Then they labeled DNA in a separate batch of phage with a radioactive isotope -Both batches of tagged phages we ... -Protein of the phage didn't enter the bacteria -Bacteria infected with tagged DNA contained radioactivity -Showed that DNA of the virus is injected into host cell ...

(2 pages) 52 2 3.8 Feb/2005

Subjects: Science Essays > Biology

To investigate the effect of phosphate on cell division in root tips.

has to occur. Phosphate is needed for production of ATP which provides energy for mitosis to occur.DNA replication occurs during interphase of the cell cycle. DNA is made up of nitrogen containing ba ... entose sugar and phosphate group. The phosphate group forms part of the sugar phosphate backbone of DNA. Phosphate is therefore necessary in DNA replication.During root growth, membranes also grow and ...

(4 pages) 52 0 4.2 May/2005

Subjects: Science Essays > Biology > Plant Biology

DNA STRUCTURE AND REPLICATION

DNA is usually a double-helix and has two strands running in opposite directions. Each chain is made ... re larger molecules (called purines) and C and T are smaller molecules (called pyrimidines). In the DNA, the two strands run in opposite directions and the bases pair up so that A always pairs with T ... he G-C pair has 3 hydrogen bonds. The G-C interaction is therefore stronger (by about 30%) than A-T.DNA REPLICATIONDNA replicates, following the process of semiconservative replication. Each strand of ...

(1 pages) 56 0 1.0 May/2005

Subjects: Science Essays > Biology

Werner syndrome Research project.

loss of up to 1256 amino acids. In other words, WS is caused by a helicase defect, and as a result, DNA replication is impaired. WS syndrome is mainly characterized by rapid aging beginning at adolesc ... ined that poly(ADP-ribose) polymerase 1 (a nuclear enzyme which protects the genome by facilitating DNA repair) was absent in WS cells (von Kobbe, et al., 2003). This enzyme responds to DNA damage by ...

(3 pages) 818 0 3.0 Dec/2005

Subjects: Humanities Essays > Health & Medicine > Diseases

Natural Selection and Darwin's Theory of Evolution (As proven in a Variation Lab)

pling technique. Genetically based reasons for variation come from the very source of life itself, DNA.Changes in DNA (genetic mutations) in a species derive variations within a certain species. ... s derive variations within a certain species. For example, possibly a small change in an anchovies DNA sequence occurred as a result of an error in DNA replication and this change affected the length ...

(6 pages) 67 0 0.0 Apr/2006

Subjects: Science Essays > Biology

Mitosis in cancerous cells

the cells replicate so rapidly (every 5-30 minutes). This allows the exposure of the bacterial cell DNA (genes) to the suspected carcinogen during DNA replication. The use of bacteria also allows rese ... affected by these therapies. This is because dividing cells are very active metabolically and their DNA (genes) are more sensitive to chemicals or radiation that might damage the DNA as it is being re ...

(6 pages) 15 0 0.0 Feb/2008

Subjects: Science Essays > Biology

Detailed description of DNA replication and RNA transcription

Detailed description of DNA replication and RNA transcription, AP level.DNA ReplicationThe purpose of DNA replication is to ... rpose of DNA replication is to make sure the daughter cell in cell division has its complete set of DNA, which occurs during the S phase of the cell cycle. To for a cell to function, it must have DNA ... se of the cell cycle. To for a cell to function, it must have DNA (exact DNA from parent cell), for DNA determines the sequence of nucleotides in mRNA, which in turn determines the sequence of amino a ...

(6 pages) 31 0 5.0 Feb/2008

Subjects: Science Essays > Biology

Cancer

ous agents. Other cancer-promoting genetic abnormalities may be randomly acquired through errors in DNA replication, or are inherited, and thus present in all cells from birth. Complex interactions be ... r after exposure to a known carcinogen. New aspects of the genetics of cancer pathogenesis, such as DNA methylation, and microRNAs are increasingly being recognized as important.Genetic abnormalities ...

(3 pages) 24 0 4.6 Mar/2008

Subjects: Science Essays > Biology > Human Biology

Structure of DNA

oteins form things such as skin, hair, and muscle. These chromosomes are very long compact coils of DNA (DeoxyriboNuclic Acid) that store all the information that the body needs such as how one looks ... a phosphate group. The sides of the ladder or the nucleotides from the two separate strands of the DNA are attached by an appendage made up of one of four separate bases. These appendages represent t ...

(4 pages) 184 1 5.0 Jun/2008

Subjects: Science Essays

the mongol empire

apoptosis, the structures in the organism can be carved out and constantly recycled.8.21. Why does DNA replicate?DNA replicates before a cell divides to give a complete set of genetic instructions to ... . What is semiconservative replication?Semiconservative replication means that only one strand of a DNA molecule is newly formed. The other strand is original DNA from the parent cell.3. What are the ...

(18 pages) 1 0 0.0 Nov/2014

Subjects: History Term Papers