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

Answer and Explanation

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.

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Correct Answer is D

Explanation

A. monosaccharides: Monosaccharides are the building blocks of carbohydrates, not lipids.
B. a glycerol plus three glycogen chains: Glycogen is a polysaccharide, not a component of triglycerides.
C. a glycerol plus three amino acid chains: Amino acids form proteins, not triglycerides.
D. a glycerol plus three fatty acid chains: A triglyceride is made of one glycerol molecule and three fatty acids-this is the primary structure of fats.

A. 46; haploid B. 23; diploid C. 46; diploid D. 23; haploid

Correct Answer is C

Explanation

A. 46; haploid: A cell with 46 chromosomes is diploid, not haploid.
B. 23; diploid: A diploid cell has two sets of chromosomes—23 from each parent, totaling 46.
C. 46; diploid: Human somatic (body) cells contain 46 chromosomes (2n)—this is the diploid state.
D. 23; haploid: 23 chromosomes is the haploid number, found in gametes (sperm and eggs), not somatic cells.

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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?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is D

Explanation

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Correct Answer is C

Explanation

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