Admin Table of Contents
- 1 What can change the chemical nature of DNA?
- 2 What are radioactive substances that can change the chemical nature of DNA classified as?
- 3 Can anything change A person’s DNA?
- 4 How does insertion mutation affect DNA?
- 5 What is the effect of UV radiation on DNA?
- 6 What kind of mutations are caused by UV radiation?
What can change the chemical nature of DNA?
Environmental exposure to certain chemicals, ultraviolet radiation, or other external factors can also cause DNA to change. These external agents of genetic change are called mutagens.
What are radioactive substances that can change the chemical nature of DNA classified as?
15 Cards in this Set
| what nucleotide pair bonds would be found in a DNA molecule | Guanine and cytosine |
|---|---|
| What is formed in the process of replication | Messenger RNA |
| What can change chemical nature of DNA that are included in the mutagen classification | X rays ,ultraviolet light ,and radioactive substances |
What is it called when a DNA segment is changed from Aattag to Aaatag?
Definition. transcription. Term. A DNA segment is changed from -AATTAG to-AAATAG.
What is chemical nature of DNA?
1). In ribonucleotides, the pentose sugar is ribose which is similar to deoxyribose except that there is an -OH group instead of -H at 2′ carbon atom. The absence of -OH group in DNA makes it chemically more stable than the RNA….Chemical Nature of DNA.
| Source | Escherichia coli |
|---|---|
| Guanine | 24.9 |
| Thy mine | 23.9 |
| Cytosine | 25.2 |
| A+T G+C | 1.00 |
Can anything change A person’s DNA?
The study uses CRISPR technology, which can alter DNA. Researchers from the OHSU Casey Eye Institute in Portland, Oregon, have broken new ground in science, medicine, and surgery — the first gene editing procedure in a living person. For the first time, scientists are altering DNA in a living human.
How does insertion mutation affect DNA?
An insertion changes the DNA sequence by adding one or more nucleotides to the gene. As a result, the protein made from the gene may not function properly. A deletion changes the DNA sequence by removing at least one nucleotide in a gene.
What is the primary enzyme used in DNA replication?
DNA polymerase
The central enzyme involved is DNA polymerase, which catalyzes the joining of deoxyribonucleoside 5′-triphosphates (dNTPs) to form the growing DNA chain.
How common are mutations during DNA replication?
Scientists have reported mutation rates as low as 1 mistake per 100 million (10-8) to 1 billion (10-9) nucleotides, mostly in bacteria, and as high as 1 mistake per 100 (10-2) to 1,000 (10-3) nucleotides, the latter in a group of error-prone polymerase genes in humans (Johnson et al., 2000).
What is the effect of UV radiation on DNA?
Graphical illustration of the effect of UV- radiation on DNA. The formation of pyrimidine dimerization cause distortion in the structure of DNA and prevents the formation of replication fork during replication.
What kind of mutations are caused by UV radiation?
UV-B and UV-C rays are two types of high-energy radiation that are capable of ionizing (removing electrons from) molecules in a process called a photochemical reaction that leads to new molecular products. UV damage occurs via two distinct types of mutations: Dimerizing mutations. Oxidative mutations.
What kind of radiation is considered a mutagen?
UV rays, X-rays, alpha rays, neutrons, and other ionizing and non-ionizing radiations are mutagenic. Usually, radiation directly damages the DNA or nucleotide structure which might be either lethal or sub-lethal.
What kind of radiation is used in DNA decontamination?
The UV-light is a non-ionizing type of radiation having less energy in it, used in the sterilization and decontamination process during the cell culture and microbiological experiments. The DNA and protein absorb UV light of 260 and 280nm, respectively.