In the serological method for tissue typing, if human cells expressing HLA-I are mixed with anti-HLA-I, complement, and trypan blue, what would indicate the cells are HLA-I?

A) Enzyme is released from neutrophils.
B) Cells are damaged by complement.
C) Trypan blue enters the cells.
D) Anti-HLA antibodies bind to HLAs on lymphocytes.
E) None of the answers are correct; the T cells are missing.


C

Biology & Microbiology

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Evaluate the following statements; which statement is accurate?

A. Scientists use the word theory to mean a hypothesis that has not been tested many times; this is the same way non-scientists use the word theory. B. Scientists use the word theory to mean a hypothesis that has been supported by many experiments; this is the same way non-scientists use the word theory. C. Scientists use the word theory in the same way that they use the word hypothesis; both mean a general idea that remains to be well tested. D. Scientists use the word theory to mean a hypothesis that has been supported by many experiments; non-scientists use the word theory to mean a hypothesis that remains to be well tested.

Biology & Microbiology

An organism described as oxidase-positive, (K/NC) on TSI media, growth at 42°C, and produces a bright bluish-green pigment on Mueller-Hinton agar is most likely:

a. P. aeruginosa. b. Pseudomonas fluorescens c. B. cepacia d. B. mallei.

Biology & Microbiology

ALL of the following have pathogen-associated molecular patterns (PAMPs) EXCEPT

a. macrophages. b. viruses. c. Salmonella spp. d. Shigella spp.

Biology & Microbiology

Please select the genera that are considered to be irregular gram-positive bacilli.

> Corynebacterium > Propionibacterium > Clostridium > Mycobacterium > Actinomyces

Biology & Microbiology