The A159E mutation causes an A amino acid to be replaced with an E amino acid (their structures are shown here). What type of mutation is the A159E mutation?
A) missense mutation
B) silent mutation
C) frameshift mutation
D) nonsense mutation
Answer: A
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Protein located in the plasma membrane or within the cell; binds to a substance that alters some metabolic aspect of the cell.
What will be an ideal response?
Suppose that you performed a version of the Hershey and Chase experiment, this time using 32Plabeled
viruses that insert their double stranded DNA into the DNA of the cells that they infect. The viral DNA is then treated as part of the cell's own DNA and is replicated during DNA replication and passed on to daughter cells when the cell divides. You infect a population of cells with the 32P-labeled viruses, then let the infected cells go through two generations of cell divisions. If you then examine the cells, you should find 32P-labeled DNA in
a. none of them. b. about of them. c. about of them. d. about of them. e. all of them.
Molecular barcodes are
A. DNA sequences used to identify and catalog biodiversity. B. barcodes stamped on vegetables in the supermarket to indicate freshness. C. genetic inversions used to detect crossovers. D. radioactively labeled genes used to detect horizontal transfer of genes.
Which of the following is a characteristic of most non-metals and is not a characteristic of most metals?
A. Has a negative charge when a current is run through its solution B. Can conduct electricity and heat C. Is malleable and ductile D. Replaces the hydrogen in acids to form stable compounds