Which of the following statements is true regarding factors associated with the immortalization of cancer cells?
A) inhibition of growth
B) stimulation of apoptosis
C) telomerase activity
D) tumor-suppressor activation
E) both choices B and D
C) telomerase activity
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Based on your knowledge of the chemistry of the cell membrane, which of the following compounds would you couple with a new drug in order to achieve better uptake by cells?
A) carbohydrates B) polar amino acids C) lipids D) several mannose-6-phosphate monomers E) any hydrophilic substance
Seasonal abscission of fruits and leaves is mediated by ____
a. abscisic acid b. ethylene c. gibberellin d. auxin e. cytokinin
In an inducible operon, the ____ is the molecular switch that controls gene expression, while the ____ is the DNA region where RNA polymerase binds to begin transcription
a. repressor; inducer b. inducer; repressor c. operator; promoter d. promoter; operator e. lactose; promoter
The different forms of a gene-for example, those responsible for eye color-are called
A) sister chromatids. B) receptors. C) alleles. D) cyclins. E) telomeres.