Stress increases the risk of heart disease because unused fat cells released during the stress response may _____.
A. erode the muscles of the heart
B. force the heart to beat too rapidly
C. be deposited on and block coronary arteries
D. increase HDL cholesterol levels
Ans: C. be deposited on and block coronary arteries
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A sudden or total lack of oxygen can cause unconsciousness in 5–10 seconds. Why?
a. The brain has very high energy requirements and lack of oxygen reduces available energy. b. Oxygen is required for ventilation and lack of ventilation causes fainting. c. Lack of oxygen causes an increase in carbon dioxide, which is toxic. d. The brain needs oxygen to breathe, and when oxygen is not available, it signals the nervous system to cause fainting.
A factor in the development of multidrug-resistant strains of Mycobacterium tuberculosis is that
A. many TB patients live in less-than ideal circumstances. B. the daily multidrug regimen lasts up to 9 months. C. multiple antibiotics must be taken in the daily regimen. D. All of the above contribute to the development of resistant strains of Mycobacterium tuberculosis.
Based on modern molecular phylogeny, which animal taxon has members with radial symmetry?
a. Ecdysozoa b. Deuterostomia c. Radiata d. Protostomia
The principal difference between eukaryotic and prokaryotic cells is that eukaryotic cells have
a. larger ribosomes than prokaryotic cells. b. cell walls, while prokaryotic cells do not. c. DNA replication and transcription in the same compartment, while prokaryotic cells do not. d. a nucleus, while prokaryotic cells do not.