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. codon; a single amino acid in the protein to be made: A codon is a sequence of three RNA nucleotides, not DNA. Codons are found in mRNA during translation.
B. triplet; the entire protein to be made: A triplet codes for one amino acid, not the entire protein.
C. triplet; a single amino acid in the protein to be made: In DNA, a triplet is a group of three nucleotide bases that codes for a single amino acid during protein synthesis.
D. codon; gene: A codon (in mRNA) corresponds to one amino acid, not an entire gene.
Correct Answer is C
Explanation
A. Anterior:
This means “front” of the body in general, but is too broad and non-specific. The abdomen is located on the anterior side, but “ventral” is the more precise term in this context.
B. Distal:
Means farther from the point of attachment; applies to limbs, not the torso/abdomen.
C. Ventral:
The ventral cavity includes the thoracic and abdominopelvic cavities. A shot to the abdomen involves the ventral aspect of the body.
D. Brachial:
Refers to the upper arm area – unrelated to the abdomen.
E. Proximal:
Means closer to the point of attachment; again, more relevant to limbs.
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