What amino acid would be produced if transcription takes place from a nucleotide with the three-base sequence ATA?
What will be an ideal response?
Tyrosine
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Which theory explains how hydrogen bonding allows water molecules to maintain a continuous fluid column as water is pulled from roots to leaves?
a. pressure flow b. evaporation c. cohesion-tension d. abscission e. fusion
Which of the following molecules spontaneously form membranes when mixed in water and most likely were one of the first organic compounds formed on Earth?
A) DNA B) Enzymes C) Phospholipids D) RNA
A bacterium living in an underground septic tank thrives by absorbing organic compounds from decomposing wastes. What is it?
A) a chemoautotroph B) a chemoheterotroph C) a photoautotroph D) a photoheterotroph
Phenylalanine hydrolase is an enzyme produced by the liver to break down the amino acid phenylalanine. Why would phenylalanine accumulate in patients with phenylketonuria?
A. They lack an inhibitor of the enzyme to break down phenylalanine. B. They produce too much phenylalanine. C. They lack the enzyme to break down phenylalanine. D. They lack the enzyme to produce phenylalanine.