Mutations in the promoter region of the ?-globin gene indicate that some areas are more sensitive than others. When mutations occur in consensus sequences (modular elements such as GC box, CAAT box, and TATA box), does transcription usually increase or
decrease? Explain.
What will be an ideal response?
Transcription should decrease because by changing these modular elements, the general transcription factors cannot bind efficiently or recruit RNA polymerase.
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The beginning of pregnancy is marked by:
A. ovulation. B. fertilization. C. implantation. D. more than 24 weeks of gestation.
Which site on a ribosome does the release factor bind to?
a. site A b. site E c. site P d. site R
The cells of plasmodial slime molds can grow to several centimeters in diameter because
A) they have organelles. B) they distribute nutrients by cytoplasmic streaming. C) the large surface can absorb nutrients. D) they form spores. E) they have a mouth to ingest nutrients.
Which of the following would be most effective in reducing the amount of CO2 in the atmosphere?
A) cyanobacteria B) anaerobic microbes C) heterotrophic organisms D) fungi E) nitrogen fixers