Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Therefore, which of the following can be true?
A) Molybdenum atoms can have between 50 and 58 neutrons.
B) Molybdenum atoms can have between 50 and 58 protons.
C) Molybdenum atoms can have between 50 and 58 electrons.
D) Isotopes of molybdenum have different numbers of electrons.
A
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In the human genetic disorder alkaptonuria, urine turns black because of the presence of homogentisic acid in individuals with the trait. This is due to
A) the presence of large amounts of homogentisic acid in the diet. B) failure of individuals with alkaptonuria to manufacture enzymes involved in the synthesis of homogentisic acid. C) failure of wild-type individuals to manufacture enzymes involved in the synthesis of homogentisic acid. D) failure of the kidneys to remove homogentisic acid from the urine. E) failure of individuals with alkaptonuria to manufacture enzymes involved in the breakdown of homogentisic acid.
What characteristics would determine whether structures from two kinds of organisms are homologous?
A) The structures should have identical functions in both organisms. B) The structures should be in different positions on the bodies of the two organisms. C) The structures should not appear in any close relatives of the organisms. D) The structures should have similar anatomy in the two organisms.
Each of the following is factor that may limit the continued advancement of science except
a) technological expertise b) human curiosity c) economic needs d) cultural beliefs
Answer the following questions true (T) or false (F)
1. B cell receptors are specific to only one antigen. 2. Antibodies may help phagocytes grab and ingest bacteria. 3. Smallpox vaccines used today are heat-killed cowpox viruses.