What step of inflammation is delayed by heparin released from mast cells and basophils?
A) Additional leukocytes are recruited to the region.
B) Capillaries dilate and become more permeable.
C) Infection is cleared by phagocytosis.
D) Macrophages engulf debris and foreign matter.
E) Foreign matter is contained.
Answer: E) Foreign matter is contained.
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Marfan syndrome can be caused by mutations in either of two genes involved in the disorder, but mutations in one of the genes blocks activity of the other. This means that Marfan syndrome demonstrates
A) variable expressivity and complete penetrance. B) an acquired phenotype. C) late onset and early onset. D) genetic heterogeneity and epistasis.
Which animal taxon is named for the cuticle or external skeleton that its members secrete and periodically molt?
a. Deuterostomia b. Ecdysozoa c. Reptilia d. Lophotrochozoa e. Protostomia
N-CAM mediates interactions between neural cells and is a member of which of the following protein families?
A) catenins B) cadherins C) selectins D) immunoglobulin superfamily (IgSF) proteins E) lectins
The bacterium Chlamydia has been linked to female infertility and cervical cancer.
a. true b. false