Therapies using stem cells are already used in:
A. bone marrow transplantation.
B. treating Parkinson's disease.
C. treating Alzheimer's disease.
D. All three of these choices are correct.
E. None of these choices are correct.
A
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The region of each antibody molecule where amino acid composition is highly diversified from one clone of B lymphocytes to another is the ________ region.
A. hinge B. joining C. variable D. light E. constant
Which of the following is NOT true of cytoplasmic determinants?
A. They are asymmetrically distributed across the unfertilized egg B. They are usually mRNAs or proteins C. They originate from the embryonic genome D. They are distributed unequally in different blastomeres as a result of cleavage
Which essential plant nutrient is used to synthesize DNA?
A. phosphorus B. potassium C. magnesium D. calcium
Which of the following organelle(s) has/have a genome separate from the genome in the cell nucleus?
A. mitochondria B. nucleolus C. both the mitochondria and the nucleolus D. both the mitochondria and chloroplasts E. chloroplasts