Most of the water moving into a leaf is lost
through
a. osmotic gradients.
b. transpiration.
c. evaporation.
d. translocation.
e. osmosis.
C
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What is the correct order of transcriptional events occurring after RNA polymerase binds to the promoter?
A. start of RNA synthesis, open complex formation, closed complex formation, promoter clearance B. closed complex formation, open complex formation, promoter clearance, start of RNA synthesis C. closed complex formation, open complex formation, start of RNA synthesis, promoter clearance D. open complex formation, closed complex formation, start of RNA synthesis, promoter clearance E. open complex formation, closed complex formation, promoter clearance, start of RNA synthesis
The most common of the sexually transmitted viral diseases agents is
A. human papillomavirus. B. herpes virus. C. human immunodeficiency virus. D. leptospirosis.
Modern oceanography and marine biology were attributed to:
a. the voyage of the Beagle. b. the discoveries of Alvin. c. the laying of the transatlantic telegraph cable. d. expeditions of Alexander Agassiz. e. the Challenger expedition.
In a segment of DNA, an A base is changed to a C and the error is copied during replication. Under which circumstances is that change considered a mutation? (Select all that apply.)
A) The change alters the phenotype of the organism's offspring. B) The change results in production of a novel protein. C) The change is in a somatic cell, such as a skin cell. D) The change is in a gene, but has no effect on a gene product or phenotype.