In order for familial retinoblastoma to appear in the phenotype
A. one new mutation must occur in a normal tumor suppressor gene
B. two new mutations must occur in a pair of normal tumor suppressor genes
C. one new mutation must occur in a proto-oncogene
D. an oncogene must mutate to a tumor suppressor gene
Answer: A. one new mutation must occur in a normal tumor suppressor gene
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How do myelin sheaths increase the speed with which action potentials are propagated along an axon?
A) They increase the permeability of Na+ ions in the plasma membrane. B) They amplify the action potential by increasing sodium influx along the entire distance of the neuron. C) They cause action potentials to "jump" down the axon rather than travel in a continuous path along every site on the axon.
In the lac operon, CAP binding to the CAP site of the promoter ____
a. occurs when glucose is present b. inhibits RNA polymerase from binding to the promoter c. occurs when cAMP is absent d. helps the repressor protein bind to the operator e. enables RNA polymerase to transcribe the operon’s genes
The method of choice for constructing a DNA profile on DNA-containing forensic evidence that is old or has been
damaged is: a. nuclear DNA sequencing. b. mitochondrial DNA sequencing. c. STR profiling. d. DNA ligation. e. RFLPs.b
Bacterial Strain A divides every 30 minutes. If you require at least 4 billion cells to perform an experiment, how many hours will you need to incubate a culture tube inoculated with a single cell of Bacteria A to get enough material to perform your experiment?
A. 4 B. 32 C. 8 D. 16 E. 2