hihudgins902
27.07.2019 •
Biology
Why might a point mutation in dna make a difference in the level of a protein's activity? why might a point mutation in dna make a difference in the level of a protein's activity? it might delay the rate of dna replication. it might exchange one stop codon for another stop codon. it might substitute a different amino acid in the active site. it might substitute the n-terminus of the polypeptide for the c-terminus. it might result in a chromosomal translocation?
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Lysozyme is a substance found in saliva, tears, and mucus that destroys the cell wall of bacteria
Skin- physical barrier
The skin has closely packed cells and it is tough, flexible and also water proof.
Phagocytes -Biological barriers;
They are types of white blood cells that help protect against pathogens.
Langerhans cells- Biological barriers;
These are specialized cells in the skin that identify pathogens that enter the body and carry them to the lymph nodes for destruction.
Acid and Oil (skin secretions) - Chemical barriers;
These are secretions from the skin that help to keep microorganism from entering the body
Sneezing and coughing - Physical barriers.
Type of reflexes that helps keep microbes and pathogens from gaining access to the body systems.