What feature of cardiac muscle helps the cells coordinate their contraction as a single unit?
A. large numbers of motor neurons
B. covalent bonds between actin and myosin molecules
C. intercalated disks rich in gap junctions
D. fused cells with multiple nuclei
Answer: C
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The half-life of Carbon-14 is approximately 5,700 years. Using this information scientists have been able to determine the age of some artifacts left by humans. A scientist wants to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered. She removed the wood (with permission) to her laboratory. Her wood sample contained 2 grams
of Carbon-14 . If the age of the wood was determined to be 22,800 years old, how much Carbon-14 originally existed in this piece of wood? A. 32 grams B. 16 grams C. 12 grams D. 8 grams E. 4 grams
African sleeping sickness is caused by
A. Trypanosoma brucei gambiense. B. Giardia lamblia. C. Histoplasma capsulatum. D. Trypanosoma brucei rhodesiense. E. Trypanosoma brucei gambiense and Trypanosoma brucei rhodesiense both cause African sleeping sickness.
Bacterial responses to phage infection can be compared to the human immune system. Which of the phrases is true?
A. Restriction-modification can be compared to adaptive immunity and CRISPR/Cas to innate immunity. B. Restriction-modification can be compared to the complement system and CRISPR/Cas to inflammation. C. Restriction-modification can be compared to B cell responses and CRISPR/Cas to T cell responses. D. Restriction-modification can be compared to innate immunity and CRISPR/Cas to adaptive immunity.
Which of the following statements about glycolysis is true?
a. Glycolysis is the main source of NADH in the cell. b. All cells perform glycolysis. c. Glycolysis is also called the Embden-Meyerhof pathway. d. Glycolysis produces glucose.