What is the difference between the blood types, A, B, and O?
A. A and B individuals have carbohydrate trees on the surface of red blood cells. O individuals do not have carbohydrate trees.
B. For each blood type, A, B, and O, there is a different sugar attachment enzyme produced.
C. A and B individuals have different modifications made to their carbohydrate tree. O individuals have no modifications made to their carbohydrate tree.
D. The glycosyl transferase gene has a different mutation in A individuals than in B individuals. O individuals have no mutations in the glycosyl transferase gene.
E. Two of these answers are correct. The glycosyl transferase gene mutations in A and B individuals prevent the removal of carbohydrate trees from the cell surface. O individuals have no mutations and therefore have no carbohydrate trees on the red blood cell surface.
C. A and B individuals have different modifications made to their carbohydrate tree.
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Which of the following best defines the term "transgenic organism"?
A) an organism that is the first of its kind to bear a particular allele B) an organism in which a genetic defect has been corrected using recombinant DNA therapy C) an organism containing a gene from another species D) an organism containing genes from three or more species
The idea that living things only originate from other living things is
A. the theory of spontaneous generation. B. the endosymbiotic theory. C. Oparin and Haldane's hypothesis. D. the theory of biogenesis.
Of the primates listed below, a human's closest extant relative is a(n)
A. mandrill. B. ring-tailed lemur. C. South American spider monkey. D. orangutan.
Darwin realized that changes that have occurred in species over time are the result of:
a. transformational processes. b. natural selection. c. ongoing processes easily observable during a lifetime. d. traits acquired during a lifetime passed on to progeny.