The mutation that causes sickle cell disease
A) occurs in the same gene that, when mutant in a different way, causes beta thalassemia.
B) deletes two contiguous DNA bases.
C) results in a single DNA base change that does not alter the encoded amino acid.
D) changes a glutamic acid to a valine in the alpha globin gene.
A) occurs in the same gene that, when mutant in a different way, causes beta thalassemia.
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Which sequence of events is ordered correctly for translation in eukaryotes?
a. the ribosome scans mRNA for AUG, eIF-2 binds to GTP, GTP is hydrolyzed b. GTP is hydrolyzed, eIF-2 binds to GTP, the ribosome scans mRNA for AUG c. eIF-2 binds to GTP, the ribosome scans mRNA for AUG, GTP is hydrolyzed d. eIF-2 binds to GTP, GTP is hydrolyzed, the ribosome scans mRNA for AUG
Treatment with glucocorticoids to suppress type IV hypersensitivity may result in
A) acquired immunodeficiency. B) anaphylaxis. C) autoimmune disease. D) DiGeorge syndrome. E) primary immunodeficiency.
The condition known as microbial antagonism may be defined as
A. microorganisms that remain with a person throughout life. B. a relationship between two organisms where one member harms the other. C. a relationship between two organisms where only one member benefits. D. an unsuccessful microbial invasion due to the presence of pre-existing microbes. E. a relationship between two organisms where both members benefit.
Protein structures have several different levels of organization. The primary structure of a protein is its amino acid sequence. The secondary and tertiary structures are more complicated
Consider the definitions below and select the one that best fits the term "protein domain." (a) a small cluster of ? helices and ? sheets (b) the tertiary structure of a substrate-binding pocket (c) a complex of more than one polypeptide chain (d) a protein segment that folds independently