The CFTR protein product is responsible for
a. pumping chloride ions out of the cell.
b. pumping water out of the cell.
c. pumping chloride ions into the cell.
d. fighting off bacterial infections.
e. regulating gene expression.
ANSWER: a
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A scientist obtains the DNA sequence datafor a bacterial plasmid. The data includes As, Ts, and Gs, but no Cs. What
is the most likely cause of this result?
a. ddCs were omitted from the sequencing reaction. b. The cytosine deoxyribonucleotides were omitted from the sequencing reaction. c. DNA polymerase was omitted from the sequencing reaction mix. d. The ddG fluorescent tags were degraded. e. There is no cytosine in this DNA molecule.
All of the following are used to construct a
theory with one exception. Select the exception.
a. repetitions of experiments. b. increased observations. c. time. d. faith. e. confirmation by many scientists
Ribosomal subunits
a. come together in threes to form functional units. b. are composed of mRNA and structural proteins. c. are synthesized in the cytoplasm. d. converge only when mRNA is to be translated. e. are transcribed from the complementary strand of DNA that is used for tRNA transcription.
What are transcription factors and how do they address the G-value paradox?
What will be an ideal response?