Sickle-cell anemia is caused by a mutation that changes the second nucleotide of the codon from GAG to GUG. This results in a change of the amino acid from glutamic acid to valine. If the mutation affected the third nucleotide of the codon and changed
GAG to GAU then the amino acid would change from a glutamic acid to aspartic acid. Would you predict this change to have the same effect?
What will be an ideal response?
A change in one polar-charged amino acid to another polar-charged amino acid would be predicted to have less of a phenotype compared to a mutation that resulted in a change from a polar-charged amino acid to a nonpolar amino acid. Changes to the third nucleotide of a codon are often less damaging than changes to the first or second nucleotide.
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The initial product of transcription is referred to as the ____ transcript
What's the answer for this one?
How do biologists define "life"?
What will be an ideal response?
Which of the following cells would not
proceed past G1?
a. most skin cells b. most liver cells c. most intestinal cells d. most red blood cells e. most nerve cells
Autoimmunity is:
a. an automatic response to an antigen. b. a failure of self cell recognition. c. a reaction to environmental antigens. d. a normal response to infection. e. a response between the autonomic nervous system and the immune system