Which of the following best describes IgM antibodies?
A) They cause basophils and eosinophils to degranulate.
B) They are the most common type of antibody in the blood during the initial stages of an immune response.
C) They are the antibody class found in body secretions.
D) They interact with phagocytes and NK cells.
E) They can cross the placenta to provide passive immunity.
B
Bloom's Taxonomy: Comprehension
Section: Elements of Adaptive Immunity
Learning Outcome: 16.18
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Diapedesis is the movement of white blood cells through intact blood vessel walls into surrounding body tissue. It typically happens when an area of the body is injured or damaged, and an inflammation response is required. What role would you expect cell adhesion molecules to play in this process?
A. Cell adhesion molecules will allow the white blood cells to cling to one another to form a migrating clot. B. Cell adhesion molecules help white blood cells adhere to the blood vessel wall so that they can migrate across the wall and infiltrate into the underlying tissue. C. Cell adhesion molecules will allow the white blood cells to attach to the injured area so they become immobile.
The five stages of a lytic infection are attachment, penetration, __________, assembly, and release
a. lysis b. prophage c. lysogenesis d. transduction e. replication
Compound leaves have:a
parallel veins instead of netted veins. b. alternate leaf attachment instead of opposite leaf attachment. c. palmately netted leaves instead of pinnately netted leaves. d. two or more leaflets instead of a single blade. e. many leaves per plant instead of a single leaf per plant.
Which of the following statements is correct regarding archaea cells?
A) Archaea cells are found only in extreme environments. B) Archaea cells are found everywhere on Earth, just like bacteria cells. C) Bacteria and archaea cells are both in the same domain in the classification of life. D) Archaea cells contain organelles just like eukaryotic cells do.