The myoglobin protein, which carries oxygen in muscle cells, has only the first three levels of protein structure. What can you infer about myoglobin?
A. Myoglobin is made of nucleic acids
B. Myoglobin lacks hydrogen bonds
C. Myoglobin is made of only one polypeptide chain
D. Myoglobin is not helical or pleated
C. Myoglobin is made of only one polypeptide chain
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When a cell acquires a new function, it usually has acquired:
A. additional nutrients. B. additional energy. C. additional volume. D. a new enzyme.
Which of the following is least important for the binding of a protein to single-stranded DNA?
A. hydrophobic interactions between guanine and tyrosine B. hydrophobic interactions between adenine and phenylalanine C. attraction between phosphate groups and lysine D. attraction between phosphate groups and arginine E. hydrogen bonding between deoxyribose and tyrosine
To be sterilized in an autoclave, infectious medical waste should be:
a. packed tightly to avoid dangerous pres-sure pockets. b. processed for 15 to 20 minutes at 121°C and 30 pounds per square inch (psi) pres-sure. c. processed for 30 to 60 minutes at 132°C and 15 psi pressure. d. processed for at least 1 hour at 121°C and 15 psi pressure.
Which of the following attributes is not common to the life and transmission cycles of Opisthorchis sinensis, Clonorchis sinensis, and Fasciola hepatica?
A. Eggs are released in the feces. B. Infection causes obstruction of the bile duct. C. Fresh water snails are an intermediate host. D. They are transmitted by consuming inadequately cooked fish.