A diagram that hypothesizes the evolutionary relationships between a set of organisms is a ____ tree
a. comparison
b. phylogenetic
c. classification
d. taxonomic
e. species
ANSWER: b
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Which of the following is NOT an example of how differential gene regulation affects cellular response?
A. The expression of proteins that are controlled by signal transduction pathways may vary in different cell types. B. Cell junctions passing ions between the cytosol of one cell to another cell. C. A cell may or may not express a receptor for a particular signaling molecule. D. The expression of proteins involved in intracellular signal transduction pathways may vary in different cell types E. Different cell types have different cell surface receptors that recognize the same signaling molecules.
The radial symmetry of adult echinoderms could best be described as ________
A) biradial B) bilateral C) fourfold symmetrical D) fivefold symmetrical
A death rate of 2.1% would represent 21 deaths per ________ individuals in a population per year
A) 100 B) 1,000 C) 10,000 D) 1,000,000
Filtering unit in the kidney
A) renal tube B) capillary C) nebular D) nephron