tRNA genes account for ________ percent of the human genome.
A) 0.001
B) 0.01
C) 0.1
D) 1
C) 0.1
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Water can move inside a root via the ____
a. symplastic pathway only b. transmembrane and symplastic pathways c. transmembrane pathway only d. apoplastic, transmembrane, and symplastic pathways e. apoplastic pathway only
Progression through the phases of the cell cycle is regulated by fluctuating concentrations of ____
a. microtubules b. actin c. cyclins d. cyclin-dependent kinases e. histones
Which of the following is the single most important stage when regulating gene expression?
a. translational regulation b. degradation of mRNA c. initiation of transcription d. RNA interference e. removal of masking segments
Infection in the urinary tract is limited by all the following except
A) constriction of the urethra by the prostate gland in men. B) the slightly acidic pH of urine. C) constriction of the urethra by the prostate gland in men and the placement of the urethra near the anus in women. D) the flushing action of urine through the ureters and urethra. E) the urinary microbiome.