Signal transduction pathways initiate activation of transcription after specific
A) TH cell death.
B) ligand-receptor binding on the cell surface.
C) cytokines diffuse across the cytoplasmic membrane.
D) antigen-antibody binding.
Answer: B
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Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationship among some extinct and living species of flightless birds. They concluded that kiwis are more closely related to African and Australian flightless birds than they are to the moas. What hypothesis did they propose from this conclusion?
A. That their data was incorrect and the sample from the museum was corrupted. B. That flightless birds only occurred once in New Zealand. C. That New Zealand was colonized twice by ancestors of flightless birds. D. That the South American species ancestors flew to New Zealand before the flightless mutation occurred. E. That the North American flightless bird originated from an ancestor of the New Zealand species.
Gene transfer that requires cell-to-cell contact is
A. transformation. B. competency. C. conjugation. D. functional genomics
Throughout the cell cycle different process can be observed. Which of the following processes occur during Gap 1?
A) production of daughter cells B) cytokinesis C) normal growth D) DNA replication
A procedure using both reverse transcriptase and real time PCR can be used to
A) determine the number of copies of a DNA sequence in a sample. B) determine the number of copies of an RNA sequence in a sample. C) produce DNA fragments for cDNA cloning. D) both determine the number of copies of an RNA sequence in a sample and produce fragments for cDNA cloning. E) produce RNA fragments for cloning.