Ans.
Different barriers present in the body prevent entry of disease causing agents or pathogens from entering into body and provide protection against them. These barriers include various physical, chemical, and biological barriers.
Physical barrier include skin and coughing and sneezing. Skin provides first line of defense by preventing entry of pathogens, and coughing and sneezing that expels harmful agents out of the body.
Chemical barriers include lysozyme, acids, and oil secretion. Lysozyme is an enzyme that kills bacteria by targeting their cell wall, while oil and acid prevent microbial growth by providing non-favorable environment for them.
Biological barriers include phagocytes and Langerhans cells. Phagocytes are immune cells that engulf and destroy pathogens and Langerhans cells are antigen-presenting cells that help in elimination of pathogens.
Seismometers and Seismographs
Answer:
Cys
Explanation:
tRNA or transfer RNA has an anticodon which base pairs with the complementary codon on mRNA or messenger RNA. It brings the amino acid corresponding to the codon present on mRNA. Since the tRNA here has anticodon ACG in 3' to 5' direction, the complementary codon on mRNA will be UGC in 5' to 3' direction. UGC codon corresponds to Cysteine amino acid which is abbreviated as Cys in three letters.
<span>Scientist believe that glycolysis is one of the very first biochemical processes that evolved due to some hard evidence. First, all living organisms perform glycolysis. The genes used in the process of glycolytic enzymes are always conserved at a high rate. Glycolysis has been found to predate atmospheric oxygen and photosynthesis due to the fact that it happens in anaerobic conditions. Finally, it also has been found to happen in cytosol which means it would have begun occurring prior to eukaryotes.</span>
Answer:
If a cell has not properly copied its chromosomes or there is damage to the DNA, the CDK will not activate the S phase cyclin and the cell will not progress to the G2 phase. The cell will remain in S phase until the chromosomes are properly copied, or the cell will undergo programmed cell death.
Explanation:
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