Phloem loading is a primary example of how ________ processes occur in plant tissues.
A. apoplastic
B. plasmodesmatal plugging
C. bulk flow upward
D. symplastic
E. sugar transport without membranes
D. symplastic
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Refer to the accompanying figure. Insulin-like growth factor would be included with which of the following pairs?
a. 1, 2 b. 3, 4 c. 6, 9 d. 7, 8 e. 10, 11
During transcription, free nucleotides of RNA bond with ____ nucleotides.
A. DNA B. other tRNA C. mRNA D. rRNA
Glycolysis is thought to be one of the most ancient of metabolic processes. Which statement supports this idea?
A) Glycolysis is the most widespread metabolic pathway. B) Glycolysis neither uses nor needs O2. C) Glycolysis is found in all eukaryotic cells. D) The enzymes of glycolysis are found in the cytosol rather than in a membrane-enclosed organelle. E) Ancient prokaryotic cells, the most primitive of cells, made extensive use of glycolysis long before oxygen was present in Earth's atmosphere.
By the ______________ theory, water is pulled upward through a plant by air's drying power, which creates continuous negative pressure.
A. transpiration B. cohesion-tension C. pressure flow D. adaptive E. water-conservation