Choose the membrane molecule responsible for aiding passage of polar molecules into and out of the cell.
A. cell surface proteins
B. transmembrane proteins
C. carbohydrate chains
D. phospholipids
Answer: B
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Immunoglobulin, TCR, and MHC proteins share structural features and have evolved by duplication and selection of primordial antigen receptors
Indicate whether the statement is true or false.
A human body cell that has 46 chromosomes goes through mitosis and produces two daughter cells that each have ________ chromosomes
a. 92 b. 23 c. 2 d. 46
In terms of the evolution of nervous systems, which events tend to occur in concert with one another?
a. brains; radial symmetry b. planaria; radial symmetry c. nerve net; bilateral symmetry d. cephalization; bilateral symmetry e. cephalization; radial symmetry
Proper cross-matching of blood type is essential for safe blood transfusion
What is the general rule for safe blood transfusion, and what are the consequences if a patient receives the incorrect blood type by accident? If a patient's blood type is unknown, what is the safest course of action?