Which statement best describes the mechanism(s) of posttranslational regulation of gene expression?
A. Once a protein is synthesized, there is little to no postranslational modification.
B. Protein synthesis is often repressed by feedback or noncompetitive inhibition.
C. Allosteric regulation following transcription of mRNA occurs in many biosynthetic pathways.
D. Covalent modification of newly synthesized proteins generally has no marked effect on protein function.
Answer: C
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Actively transcribed regions of eukaryotic chromatin have a diameter of approximately:
A. 10 microns B. 2 nanometers C. 30 nanometers D. 1400 nanometers E. 10 nanometers
Disagreements between conclusions obtained from rDNA data and other techniques may be explained by
A. horizontal DNA transfer. B. vertical DNA transfer. C. the difference in translation machinery. D. vertical RNA transfer.
The ________ is responsible for the monitoring of infectious disease and the implementation of prevention and control strategies world-wide.
What will be an ideal response?
The energy of the movement of electrons down a concentration gradient via electron transport within the thylakoid membrane is used to generate
A) glucose. B) CO2. C) H2O. D) O2. E) ATP.