A human gene is composed of numerous fragments of protein-encoding information known as _______.
A. DNA
B. mRNA
C. exons
D. introns
C. exons
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In which organelle would the defective enzyme be found?
Tay-Sachs disease is an inherited neurological disorder in which a defective enzyme prohibits the hydrolysis of phospholipids called gangliosides. A. lysosome B. cytoplasm C. endoplasmic reticulum D. Golgi apparatus E. mitochondrion
What is the key activity of panel II in the accompanying figure?
a. The enzyme is consumed as the products form. b. The substrate leaves the active site. c. The conversion of substrates to products occurs. d. The product leaves the enzyme. e. The product decomposes to the reactants.
Chemical evolution:a
cannot be investigated experimentally. b. was tested in experiments performed by Watson and Crick. c. occurred about 1 billion years ago. d. resulted in simple organic molecules. e. started with unicellular prokaryotic organisms.
Choose the largest block of time.
A. epoch B. period C. age D. era