The elemental cobalt (Cobalt 59) has an atomic number of 27 and a mass number of 59. Cobalt 60 is a radioactive atom used in cancer therapy. You would say Cobalt 60 is an of Cobalt 59, and has how many neutrons in its nucleus?
isotope; 27
isomer; 33
isotope; 33
isotope; 32
The Correct Answer is C
A. isotope; 27: The atomic number (27) refers to the number of protons, not neutrons. Isotopes have the same protons, different neutrons.
B. isomer; 33: An isomer is a different structural arrangement of the same molecules-not applicable here.
C. isotope; 33: Cobalt 60 is an isotope of Cobalt 59 (same protons, different neutrons).
Neutrons = mass number – atomic number = 60 – 27 = 33
D. isotope; 32: 60 – 27 = 33, not 32 neutrons.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Cardiovascular:
Transports blood, but does not directly sense/respond to environmental changes.
B. Lymphatic:
Supports immune function and fluid balance, but not primarily responsible for homeostasis.
C. Endocrine:
Regulates hormones and maintains long-term homeostasis such as temperature, fluid balance, and glucose levels.
D. Respiratory:
Involved in gas exchange, but homeostasis is a secondary role.
E. Urinary:
Eliminates waste and regulates volume, but is a response mechanism rather than a regulatory system.
Correct Answer is C
Explanation
A. osmosis: Osmosis is passive (requires no energy), so it will still occur even if mitochondria are poisoned.
B. facilitated diffusion: Facilitated diffusion uses transport proteins but does not require ATP-still functional without mitochondria.
C. active transport: Active transport requires ATP, which is produced by the mitochondria. Blocking mitochondria interrupts ATP production, halting active transport.
D. through channels: Movement through ion channels is usually passive (e.g., diffusion), and does not require ATP.
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