Jess has A- blood type, has never received a blood transfusion, and never been pregnant. Antibodies against what blood antigens could be present in Jess' blood?
A) O and Rh antigens
B) B antigens
C) A antigens
D) B and Rh antigens
E) O antigens
B
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Sea cucumbers and sea urchins belong to the phylum
A. Cnidaria. B. Mollusca. C. Arthropoda. D. Nematoda. E. Echinodermata.
Post-translational modifications are responsible for
a. activation, inhibition, and stabilization of enzymes. b. inhibition of enzymes only. c. activation, inhibition, and synthesis of enzymes. d. synthesis of enzymes and allosteric enzyme control. e. synthesis of enzymes only.
The letter "B" from the above figure represents
a. complement. b. MHC markers with antigen expressed to the surface of a cell. c. lysosome with MHC molecule. d. plasma membranes fusing. e. MHC recycling
What are the conducting elements in phloem?
a. tracheids b. vessel elements c. fibers d. parenchyma e. sieve tube elements