A person who is homozygous for a mutation of the phenylalanine hydroxylase gene
A. can lead a normal life if the environment is controlled.
B. cannot give blood.
C. will always develop mental retardation in early infancy.
D. will require phenylalanine supplements throughout life.
E. Two statements are correct. They can lead a normal life if the environment is controlled by taking phenylalanine supplements.
A. can lead a normal life if the environment is controlled.
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A tautomer is
A) a mutagen. B) an RNA base. C) an alternate structure of a molecule. D) the type of bond that holds DNA bases together.
Members of the lineage ____ are called lancelets. As adults they live mostly buried in the sand in
warm, shallow marine habitats, but they do have well-developed segmented muscles and can move.
a. Petromyzontoidea b. Placodermi c. Cephalochordata d. Urochordata e. Myxinoidea
Succession occurs in both aquatic and terrestrial environments
Indicate whether the statement is true or false
The main reservoir of plant-available phosphorus is organic matter in the soil
Indicate whether the statement is true or false