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DNA damage can be recognized by enzymes, and thus can be correctly repaired using the complementary undamaged strand in DNA as a template or an undamaged sequence in a homologous chromosome if it is available for copying. If a cell retains DNA damage, transcription of a gene can be prevented and thus translation into a protein will also be blocked.
DNMT1 is the proposed maintenance methyltransferase that is responsible for copying DNA methylation patterns to the daughter strands during DNA replication. Mouse models with both copies of DNMT1 deleted are embryonic lethal at approximately day 9, due to the requirement of DNMT1 activity for development in mammalian cells. [citation needed]
21.18 DNA. 2 comments. 22 December 22. Toggle December 22 subsection. 22.1 Zinc lozenges. ... Download as PDF; Printable version; In other projects Appearance. move ...
Genes are made of DNA. DNA is a long molecule made up of individual molecules called nucleotides. Genetic information is encoded in the sequence of nucleotides, that make up the DNA, just as the sequence of the letters in words carries information on a page. The genes are like short instructions built up of the "letters" of the DNA alphabet.
Chloroplasts probably evolved following an endosymbiotic event between an ancestral, photosynthetic cyanobacterium and an early eukaryotic phagotroph. [17] This event (termed primary endosymbiosis) is at the origin of the red and green algae (including the land plants or Embryophytes which emerged within them) and the glaucophytes, which together make up the oldest evolutionary lineages of ...
The most important chemicals causing cancer are those that produce DNA damage, since such damage appears to be the primary underlying cause of cancer. [104] The most carcinogenic compounds in cigarette smoke are acrolein, [105] formaldehyde, [106] acrylonitrile, [107] 1,3-butadiene, [108] acetaldehyde, [109] ethylene oxide, [110] and isoprene ...
Psychology is the scientific study of mind and behavior. [1] [2] Its subject matter includes the behavior of humans and nonhumans, both conscious and unconscious phenomena, and mental processes such as thoughts, feelings, and motives.
Evolutionary psychology is a theoretical approach in psychology that examines cognition and behavior from a modern evolutionary perspective. [1] [2] It seeks to identify human psychological adaptations with regards to the ancestral problems they evolved to solve.
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