Cell-mediated immune responses, such as attacking and killing microorganisms or host cells that are damaged or infected, are carried out by:
a. lymphocytes of the thymus-derived (T) class.
b. lymphocytes of the bone marrow–derived (B) class.
c. neutrophils.
d. nasophils.
A
The purpose of T lymphocytes, including killer and helper cells, is to attack and kill specific mi-croorganisms or abnormal host cells.
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When a cell responds to a signal it sent, this is an example of _____.
A. Direct intercellular signaling B. Endocrine signalling C. Paracrine signaling D. Autocrine signaling E. Contact-dependent signaling
In response to environmental conditions, the average beak size in a population of birds may change between successive generations. This process of change is referred to as ________
A) macroevolution B) sequestration C) speciation D) coalescence E) microevolution
ABO blood type is a trait that demonstrates _______ inheritance.
Fill in the blank(s) with the appropriate word(s).
)
A. The CDC is primarily responsible for the tracking of infectious diseases in the United States. B. Barbara McClintock helped establish the foundations of modern epidemiology. C. Epidemiologists only study infectious diseases and their statistics within a population. D. Epidemiologists study the frequency and distribution of disease within a population.