Leucine zipper proteins regulate transcription by:
a. forming dimers with zinc finger transcription factors.
b. changing the chromatin structure to heterochromatin
c. blocking DNA regulatory elements.
d. binding to and activating DNA regulatory elements such as enhancers and silencers.
e. degrading RNA polymerase.
d
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Which form of transport requires the expenditure of energy?
A. Active transport B. Facilitated diffusion C. Osmosis D. Passive transport
Phosphonate comprises 25% of the ________ phosphorous pool in marine environments
A) inorganic B) organic C) insoluble D) biologically unavailable
From personal experience, you may have noticed that cut flowers placed in a vase with tap water continue to be "alive" for several days. What is the most likely explanation as to why these cut flowers don't immediately wither and die?
A. The tap water in the vase is an excellent source of nitrogen. B. The plant can still take up water from the vase via an "evaporative pump." C. Cells in the flower petals continue to carry out photosynthesis. D. Cavitation allows for water to still be transported through the flower stems.
Most seabirds are ovoviviparous
Indicate whether the statement is true or false