Diving mammals like whales and seals experience frequent periods when they are not able to breathe air. Which of the following is a muscle adaptation they show to this challenge?
A. increased myoglobin concentrations
B. increased capillary densities
C. increased amounts of sarcoplasmic reticulum
D. increased expression of acetylcholine receptors
E. All of the choices for this question are correct.
A. increased myoglobin concentrations
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A 2009 study of more than 4,300 people identified a(n) ____ as the most likely reason why the least-fit among the group had higher mortality rates than the moderately fit and most-fit.
a. lack of opportunities b. addiction to drugs c. addiction to alcohol d. sedentary lifestyle e. unhealthy environment
Restriction fragment length polymorphisms are used to
a. test the effectiveness of different restriction enzymes on a sequence of DNA. b. compare the DNA sequences between individuals by looking for changes in restriction enzyme digest patterns. c. compare DNA sequences by determining the full DNA sequence. d. prepare DNA for further sequence analysis. e. treat sickle-cell anemia.
Although carbon dioxide contains carbon, it is
not considered an "organic" compound because a. it is not found in the earth's crust. b. it is not present in living cells. c. the carbon atom is not bonded to at least one hydrogen atom. d. the carbons are not in chains or rings. e. it is too small.
Which sensory distinction is NOT encoded by a difference in neuron identity?
A) red and green B) loud and faint C) salty and sweet D) spicy and cool