Which of the following is not true of fluorescent in situ hybridization (FISH)?
A. It can be used to identify unknown bacteria without culturing.
B. It can be used to detect RNA in cells.
C. Probes can locate genes on chromosomes.
D. It uses electrophoresis to separate the DNA.
E. Probes can be applied to intact cells.
Answer: D
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The lac operator site within the lac operon is an example of which of the following?
A. cis-acting element B. para-acting element C. trans-acting element D. inter-acting element E. contra-acting element
What do enzyme-linked receptors and growth factor receptors have in common?
A. Both act as transcriptional factors. B. Both possess kinase activity when bound to a hormone. C. Both regulate the transport of ions through channels. D. Both regulate specific G proteins when bound to a hormone. E. Both seldom affect the expression of genes within the nucleus.
When ocean levels dropped about 70 million years ago, marsupial mammals moved into North America and displaced many of the placental mammal species
a. true b. false
In the "kitchen-sink model" for CD4 T-cell loss, what does the sink's drain represent?
A. the amplification of the virus in the blood B. the wide variety of possible opportunistic infections C. the destruction of the virus by the immune system D. the production of new CD4 T cells E. the destruction of CD4 T cells by the virus