Refer to Figure 44-2. Cell type__________ is/are primarily responsible for the release of histamine in
injured tissues and in allergic responses.
a. A only
b. B only
c. C only
d. D only
e. A and cell type D
CC
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In a multicellular organism, cellular exchange with the environment can only occur if ________.
A) cells have access to a suitable watery environment B) the body is a closed system C) homeostasis requires energy expenditure D) temperatures are variable
In which soil would the cactus receive the most appropriate amount of water for its needs?
a. soil A b. soil B c. soil C d. It would receive the appropriate amount of water from all the soil types.
The difference between normal and sickle-cell
hemoglobin is based upon a. the number of amino acids in the molecule. b. the substitution of one amino acid for another. c. the number and orientation of the amino acid chains attached to the heme portion of the molecule. d. the number of oxygen molecules that can be carried. e. the type of bone marrow that produces it.
Histone modifications that play a role in silencing expression of tumor suppressor genes are influenced directly by
A) microRNAs. B) epidermal growth factor signaling. C) p53 activity. D) carcinogens. E) APC activity.