Which of the following is a major finding from the ENCODE project?
A. DNA methylation usually signifies the activation of gene expression
B. In humans, one gene encodes exactly one protein.
C. Gene regulation is achieved through a complex network of regulatory regions throughout the genome.
D. Less than 20% of human DNA is linked to biological function.
E. There are more than 10 million regulatory sites in human DNA.
A
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Hox genes, one class of ____ genes, contain a conserved ____ region to which transcription factors containing a
corresponding ____ bind.
a. maternal effect; homeodomain; homeoboxb. segmentation; homeobox; homeodomain c. segmentation; homeodomain; homeobox d. homeobox; homeobox; homeodomain e. homeobox; homeodomain; homeobox
Which of the following accounts for the negative control of operons?
a. promoters b. repressors c. structural genes d. operators e. deactivators
The urinary system helps to maintain the extracellular fluid pH by ____
a. synthesizing buffers b. retaining carbon dioxide in the filtrate c. excreting excess hydrogen ions d. combining hydrogen ions with urea e. excreting filtrate
Which structure is a characteristic found only in angiosperms?
A. flower B. leaf C. megaphyll D. seed E. vascular tissue