Lactose induces the transcription of the lactose operon by:
a. binding to the allosteric site of the repressor after being converted to allolactose.
b. stimulating lactose metabolism in the cell.
c. first being converted to glucose, then binding to the repressor.
d. binding to the allosteric site of RNA polymerase.
e. inhibiting the activity of CAP.
a
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The statements about transport of Ca2+ from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration) are true EXCEPT which of the following?
A. Calcium movement involves the use of a pump. B. Calcium movement involves active transport. C. Calcium movement occurs by facilitated diffusion using a transporter protein. D. Calcium movement requires energy. E. Calcium movement occurs through a transmembrane protein.
What is the sugar component of DNA?
a. Glucose b. Sucrose c. Deoxyribose d. Lactose e. Ribose
Which of the following is an HIV enzyme
essential for its successful replication in a host cell?
a. reverse transcriptase b. RNA polymerase c. DNA polymerase d. protease e. ligase
Which term refers to the renewal of a natural ecosystem that has been degraded?
a. ecological balance b. ecological restoration c. eutrophication d. biological magnification e. bioremediation