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Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) The ideal gas law involves the variables P, V, T, and R, and the constant n.
(2) Boiling is a special form of evaporation that occurs when atmospheric pressure exceeds the vapor pressure of the hot liquid.
(3) The two requirements for hydrogen bond formation are molecular polarity and the presence of covalently-bonded hydrogen atoms.
Phenylalanine
An essential amino acid important in the biosynthesis of proteins.
Recessive Gene
A type of gene that expresses its traits only when paired with an identical or similar gene, as opposed to a dominant gene that can express its traits when paired with a different gene.
21st Chromosome
A chromosome in humans that, when an individual has three copies (trisomy 21) rather than the usual two, causes Down syndrome.
Down Syndrome
A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, characterized by developmental delays, physical growth limitations, and distinctive facial features.
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