While running in a garden, a girl steps on an old board and a nail goes through her shoe and skin, causing a deep
puncture wound. Which non-specific defense mechanism will aid in protecting her from pathogens?
a. ciliated epithelial cells
b. lysozyme
c. acidic skin secretions
d. inflammation
e. cytotoxic T cells
ANSWER: d
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Factor(s) not found in abscesses is/are
A. pus. B. dead leukocytes. C. tissue remnants. D. blood vessels.
The primary difference between individual nucleated cells in a developing zygote is the ____
a. genetic code of each cell b. differential expression of housekeeping genes c. differential expression of regulated genes d. number of chromosomes present in the nucleus e. presence or absence of gene regulators
Which of the following is the period of rest between meiosis I and meiosis II?
a. Interkinesis b. Synapsis c. Telophase d. Metaphase
The clonal selection theory implies that
A. antigens activate specific lymphocytes. B. related people have similar immune responses. C. memory cells are present at birth. D. the body selects which antigens it will respond to. E. only certain cells can produce interferon.