PKU is a human disease in which the affected
individual is unable to metabolize the amino
acid, phenylalanine. Symptoms of this disease
include mental retardation, a lack of
pigmentation, and black urine. PKU is an
example of
a. epistasis.
b. pleiotropy.
c. incomplete dominance.
d. co-dominance.
e. complete dominance.
B
You might also like to view...
The selective permeability of a membrane refers to the ____
a. movement of a molecule from an area of high concentration to an area of low concentration b. ability of a substance to pass through any membrane c. ability of only certain molecules to pass across a membrane d. need for carrier proteins to transport some molecules across a membrane e. ability of molecules to be transported across a membrane
Which of the following most accurately describes the
cellular activity associated with the actual passage of a nerve impulse? a. electrical discharge b. action of sodium-potassium pump c. wave of depolarization and repolarization d. hyperpolarization followed by rebalancing e. active transport of ions
The primary but not only process responsible for the modifications that occur in organisms over geological time is:
a. genetic mutation. b. natural selection. c. morphological (phenotypic) modification. d. increase in fitness.
Which of the following is mainly produced during cyclic electron flow?
A. water B. NADPH C. sugar D. ATP E. O2