In the Bombay phenotype, a gene in the recessive condition blocks the expression of A and B red blood cell antigens
Thus, all A, B, and AB genotypes are expressed as the O phenotype. This is an example of ____.
a. complete dominance
b. epistasis
c. incomplete dominance
d. co-dominance
e. pleiotropy
ANSWER: b
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Standing still and at attention for long periods can result in inadequate venous return. The effects of this can be seen when even young and healthy soldiers sometimes faint when standing at attention for long periods. Which of the following is NOT occurring to promote return of blood from the venous system in this situation?
A. sympathetic activation of smooth muscle in large veins B. skeletal muscle activity compressing veins and forcing blood flow C. one way flow in the venous system due to valves D. ventricular contraction E. None of the choices for this question are correct.
Which of the following statements about energy is incorrect?
A. Chemical bonds store potential energy. B. All forms of energy can be converted to heat. C. A boulder perched on a hill has kinetic energy. D. Energy is defined as the ability to do work. E. The biological world gets its energy from the sun.
Enzymes, some hormones, and structural molecules like keratin and collagen are examples of ______________.
a. carbohydrates b. nucleic acids c. proteins d. lipids
Which of the following recognizes and binds to MHC I proteins and helps stabilize the binding of epitopes to T cell receptors?
A) CD8 B) MHC I C) CD26 D) CD4 E) CD95