Based on molecular analyses, scientists now believe the domestication of the closest relatives of modern dogs began
between ____ years ago.
a. 800 and 1,200
b. 1,000 and 3,000
c. 4,000 and 8,000
d. 9,000 and 12,000
e. 18,800 and 32,100
ANSWER: e
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A. It converts GTP to cGTP. B. It acts as a secondary nucleotide messenger. C. It is a sensor kinase. D. It is an autoinducer.
Three scientists are using different forms of PCR for their research. Abby wants to determine changes in gene expression levels in a tissue, so she uses ______. Bob is trying to extract genetic information from a wooly mammoth fossil, so he uses ______. Chris needs to express a gene in bacteria that matches the form expressed in kidney cells, so she uses ______.
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Which of the following is a source of carbon skeletons that are used in the synthesis of amino acids?
A. Acetyl-CoA B. Glycolysis intermediates C. TCA cycle intermediates D. All of the choices are correct.
The nucleus is to eukaryotes as the ________ is to prokaryotes.
A. pili B. glycocalyx C. ribosome D. nucleoid E. cell wall