If the mean annual precipitation of a region, currently characterized by grasslands, was to increase by 50 cm. per year, what type of biome(s) would evolve in that region?
A. taiga and temperate rain forests
B. savanna
C. deserts and tropical rain forests
D. temperate forests
E. temperate forests and shrublands
Answer: D
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One gene is able to encode information for different forms of a protein via ____
a. alternative splicing b. primary splicing c. secondary splicing d. mRNA mutations e. tRNA mutations
When reporting a direct smear from a primary specimen, it is important to note all of the following except:
a. white blood cells. b. squamous epithelial cells. c. artifacts. d. prominent cell shapes and arrangements.
A neuron fires when Na+ ions
A. move down their concentration gradient by the process of facilitated diffusion. B. are actively pumped down their concentration gradient. C. move against their concentration gradient spontaneously. D. are actively pumped against their concentration gradient. E. are released from an internal store.
Spherocytosis is a human blood disorder associated with a defective cytoskeletal protein in the red blood cells (RBCs). What do you suspect is the consequence of such a defect?
A) abnormally shaped RBCs B) an insufficient supply of ATP in the RBCs C) an insufficient supply of oxygen-transporting proteins in the RBCs D) adherence of RBCs to blood vessel walls, causing plaque formation