What would be the consequence if one base were changed in the base sequence of a DNA molecule?
A) Messenger RNA would correct the mistake. B) Protein synthesis would stop.
C) Genome copying would be impossible. D) A defective protein could be produced.
Answer: D
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Nutrient transport requires energy because the nutrients must be transported into the cell against a concentration gradient. The energy required for nutrient transport is supplied by
A) ATP. B) the proton motive force. C) phosphoenol pyruvate. D) ATP, the proton motive force, or phosphoenol pyruvate.
A biologist uses a time machine to collect living material from 2 different time periods. Sample A is 3 billion years old and sample B is 1.5 billion years old. How would these samples differ?
A. Prokaryotic organisms would be abundant in sample A but absent from sample B. B. Eukaryotic organisms would be present in both samples but much more common in sample B. C. Prokaryotic organisms would only occur in sample B. D. Eukaryotic organisms would be absent from sample A.
Which type of cell produces proteins that form the tough, water-insoluble layer in the skin?
a. melanocytes b. Granstein cells c. keratinocytes d. Langerhans cells e. pigmented cells
The notion that organisms that are more distantly related should have time to accumulate more biochemical differences than those more closely related can best be illustrated using
A. radioactive isotope dating. B. a molecular clock. C. gel electrophoresis. D. a geologic time scale.