The net direction that an ion or molecule
moves is
a. dependent upon the size of the molecule.
b. unpredictable because the movement is
random.
c. the result of concentration differences.
d. controlled by the temperature of the
medium.
e. controlled by the membranes in the
vicinity.
C
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When plants reduce SO4 to form H2S during ____________, SO4 ___________ electrons
A. assimilation; gains B. assimilation; loses C. anammox; gains D. anammox; loses E. anaerobic respiration; gains F. anaerobic respiration; loses
DNA photolyase, in the presence of visible light, can repair DNA damage due to ultraviolet radiation.
Answer the following statement true (T) or false (F)
Which statement is true?
a. Morphology no longer informs phylogenetic classification. b. Cnidarians are the only organisms classified as Radiata. c. Phylogenetic trees are hypotheses, and frequently change. d. Mitochondrial DNA is only used to classify extinct organisms.
Which one of the following statements about transport of nutrients in phloem is false?
a) Differences in osmotic concentration at the source and sink cause a hydrostatic pressure gradient to be formed. b) Companion cells control the rate and direction of movement of phloem sap. c) A sink may be located anywhere in the plant. d) A sink is that part of the plant where a particular solute is consumed or stored. e) Solute particles can be actively transported into phloem at the source.