A biologist develops a new drug that seems to dramatically slow the onset of symptoms resulting from HIV infection
Close monitoring of HIV-infected cells reveals that the viral proteins are in the form of long polyproteins. The biologist most likely developed a _____.
A) reverse transcriptase inhibitor
B) CD4 inhibitor
C) protease inhibitor
D) polymerase inhibitor
Answer: C
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What factors are utilized by the cell in order to recognize the stop codon and disassemble the translation machinery?
A. elongation factors B. release factors C. transcription factors D. initiation factors E. mRNA factors
How does the presence of allolactose affect the lactose operon? a. Allolactose binds to the repressor, altering its shape so it cannot bind to operators
b. Allolactose binds to the operators so the repressor cannot bind there. c. Allolactose binds to the promoter so RNA polymerase may not bind there. d. Allolactose has a homeodomain that binds to specific base sequences in the first gene, blocking transcription.
What is the most significant advantage of using RNAi to study development?
A) Geneticists have only been able to identify a subset of the genes involved in development. B) Genetic studies of a single gene can be completed without creating new mutant organisms. C) RNA is easy to isolate. D) RNAi causes phenotypes not typical of in vivo development.
Diffusion of water through a differentially permeable membrane is called
A. active transport. B. energy. C. osmosis. D. All of these answers are true.