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 A
Explanation
A. from Side A to Side B: Osmosis is the movement of water from a region of lower solute concentration (10%) to one of higher solute concentration (20%) to equalize the concentration.
B. from Side B to Side A: This would occur only if Side A had a higher solute concentration, which it doesn't.
C. there will be no movement of water: There’s a concentration gradient, so water will move.
D. water will move from B to A and A to B at equilibrium: Equilibrium implies equal concentrations, which is not the case initially.
Correct Answer is D
Explanation
A. quaternary: Quaternary structure involves the interaction of multiple polypeptide chains, not folding of a single chain.
B. primary: Primary structure is the linear sequence of amino acids.
C. secondary: Secondary structure includes alpha helices and beta-pleated sheets, but not their 3D folding.
D. tertiary: Tertiary structure is the 3D shape formed by the folding of secondary structures, stabilized by hydrogen, ionic, and disulfide bonds.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.