A child complains of intensely itchy "pimples" on the hands and wrists. The lesions are small inflamed streaks, but do not appear to contain pus. The child's condition may be the result of infection with
A) Staphylococcus epidermidis.
B) Sporothrix schenkii.
C) Sarcoptes scabiei.
D) Pseudomonas aeruginosa.
E) Clostridium perfringens.
C) Sarcoptes scabiei.
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Antigen presenting cells
A. include macrophages. B. engulf and modify antigen to be more immunogenic. C. include dendritic cells. D. hold and present processed antigen on their cell membrane surface. E. All of the choices are correct.
What disease was studied in a famous pedigree analysis that included thousands of people?
a. Alzheimer’s disease b. Huntington’s disease c. cystic fibrosis d. sickle-cell anemia e. Turner’s syndrome
In the blood clotting process, platelets arrive at the site of damage and start secreting substances to attract more platelets. More platelets arrive at the site and secrete attractants to recruit more platelets. This is an example of:
A. positive feedback. B. negative feedback. C. electrical signaling. D. feedforward regulation.
Choose the feature of protein synthesis in column 2 that best matches the statement in column 1
A) neither prokaryotic nor eukaryotic protein synthesis B) eukaryotic protein synthesis C) both prokaryotic and eukaryotic protein synthesis D) prokaryotic protein synthesis 1) AUG is the start codon 2) the initial amino acid is N-formylated 3) requires the presence of eIFs for translational initiation 4) peptide bond formation catalyzed by an RNA molecule 5) presence of Shine–Dalgarno sequence 6) mRNA is translated 3? ? 5?