A genetic disorder that involves impaired
blood clotting is
a. leukemia.
b. sickle cell anemia.
c. hemophilia.
d. atherosclerosis.
e. hypertension
C
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Salamanders normally go through a juvenile stage in which they have external gills. Most salamanders lose these gills when they develop into adults, but axolotl salamanders retain gills into adulthood by suppressing metamorphosis. This is an example of
A. gene duplication. B. co-opting a gene for a new function. C. homeosis. D. heterochrony. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about heterochrony? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
When sodium ions flow into the axon
cytoplasm,
a. the membrane potential reverses. b. the cytoplasm becomes more positively charged. c. the interstitial fluid becomes more negatively charged. d. an action potential is generated. e. all of these things happen
Once a prion enters a nerve cell, it essentially
A) assumes the correct folding orientation for the protein. B) stops the cascade of misfolding events associated with adjacent cells. C) becomes self-propagating, causing misfolding of nearby normal proteins. D) differentiates into a nonreplicating virus. E) differentiates into a replicating virus.
What is the most common fracture in elderly women with osteoporosis?
A) Colles fracture B) Fractured ankle C) Fracture of the neck of the femur D) Fractured vertebrae E) Fractured collarbone