Type 1 fucosidosis is a rare human disease. Patients cannot hydrolyze the disaccharide fucose, and as a result have severe neurological decline and die by age 6. The disease is due to a defect in the gene that encodes the lysosomal enzyme that breaks down fucose (?-1-fucosidase), and is inherited in an autosomal recessive manner. Jane and John have a child who has Type 1 fucosidosis. What is
the probability that their next child will also have the disease?
A. No chance
B. 1/4
C. 1/2
D. 3/4
E. 4/4 or 100%
B. 1/4
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Facultative, intracellular parasitic bacteria are those that are able to:
a. be cultured with or without oxygen but in cell cultures only. b. exist in both intracellular and extracellular environments. c. be cultured only with oxygen and in cell cultures. d. be cultured only inside living organisms such as mice.
Select all of the bones that form joints with the humerus.
A. Metacarpals B. Radius C. Phalanges D. Scapula E. Ulna
Which of the following statements concerning malignant melanoma is false?
a. It is the fastest growing (in number of incidents) form of skin cancer. b. It is the most lethal form of skin cancer. c. It is the third most common form of cancer in humans. d. Its highest incidence is in light-skinned individuals. e. It is caused by excessive exposure to UV irradiation.
In biology, an evolutionary innovation is also referred to as a
a. derived character b. taxonomic group c. molecular clock d. physical similarity