Albinism is a recessive disorder in which the skin and hair fail to produce pigment. The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
What is Bill's genotype?
A. NN
B. nn
C. Nn
D. Cannot be determined
Answer: C
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a. facilitated assembly of early organic polymers by concentrating monomers through it's negative charge b. was present at hydrothermal vents c. provided energy for early metabolism d. has a positive charge and repelled organic monomers e. helped physically form the plasma membrane of protocells
Erosion of the gastrointestinal tract that results in a sore is called a ________
A) pore B) chancre C) peptic ulcer D) diverticulum
The events of binary fission are
I. the cell doubles in size II. the DNA is replicated III. the cell forms a septum IV. the cell separates from its offspring
HIV strains may differ by 10% within one person and by 35% in people around the globe. This is due to
A. the fact that HIV targets T cells. B. the fact that HIV inserts its genome into the host genome. C. both cellular and antibody-mediated responses. D. HIV's high rate of mutation. E. the fact that most people do not die from HIV infection.