Gene regulation in both prokaryotes and eukaryotes ____
a. involves significant chromatin remodeling
b. requires transcription and translation to occur in separate cellular compartments
c. produces differentiated cells
d. involves transcriptional control
e. involves alternative splicing
ANSWER: d
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Micro RNAs (miRNAs)
a. are short sequences only 22 or so bases long. b. are noncoding RNA sequences that bind to a protein complex. c. can regulate mRNA translation by cleaving the mRNA. d. can prevent translation of its target mRNA by blocking the ribosome. e. all of these
Which of the following can undergo metabolic conversion to acetyl CoA and enter the citric acid cycle?
Glucose Fatty acids Protein All of the choices are correct.
What is the definition of anemia?
A) a decrease in the oxygen carrying capacity of the blood B) a decrease in hemoglobin C) an increase inPCO2 D) a decrease in the affinity of hemoglobin for oxygen E) a decrease in PO2
The chemicals in "beta-blocker" drugs reduce anxiety symptoms by:
A) binding to beta-receptors, thereby preventing adrenaline from binding to the cell. B) causing cholesterol to bind to beta-receptors, thereby blocking adrenaline from binding to the cell. C) causing carbohydrates to bind to beta-receptors, thereby blocking adrenaline from binding to the cell. D) preventing receptor proteins from binding to the lipid bilayer of a cell membrane. E) preventing receptor proteins from binding to enzymatic proteins.