Some of the more persistent wildlife and animals that visit gardens includes raccoons, deer, moles, rabbits, cats and dogs. One of the best ways to keep wildlife and other animals out of the area is to place plants the animals dislike around the outside of the garden or landscaping.
Home Â» Biology Â» Antigenic shift Antigenic shift Antigenic shift is the process by which two different strains of influenza combine to form a new subtype having a mixture of the surface antigens of the two original strains. Because the human immune system has difficulty recognizing the new influenza strain, it may be highly dangerous.
Point Mutations. A point mutation is a single-letter swap -- an exchange of two bases (adenine to cytosine, for example) at a single location in the DNA molecule. Since the sequence of letters in a gene determines the sequence of amino acids in the protein it encodes, a point mutation can change the amino acid sequence of the resulting protein. Sometimes a change in the protein's amino acid sequence can have dramatic results. For example, sickle cell disease occurs when a single-point mutation in the gene that encodes the hemoglobin molecule results in deformed red blood cells.