Annual growth rings are formed in woody
stems principally through the activities of the
a. cork cambium.
b. cortex.
c. vascular cambium.
d. apical meristem.
e. endodermis
C
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Bacteriophage ? inserts into a bacterial chromosome using which of the following?
A. Nucleotide excision repair B. Endonuclease activity C. Site-specific recombination D. DNA gap repair
While researching the effects of light on chlorophyll synthesis in sorghum, you find that brief pulses of red light stimulates the synthesis of chlorophyll a and b. This would suggest that chlorophyll synthesis is directed by the Pr form of phytochrome.
Answer the following statement true (T) or false (F)
When amino acid tryptophan is readily available on the growth media, bacteria do not have to synthesize this molecule. Genes controlling this mechanism are under control of
A. A reproducible operon B. An inducible operon C. Catabolic repression D. Global regulation E. A repressible operon
Which of the following occur without coupling transport of the solute to the movement of a second solute?
(a) import of glucose into gut epithelial cells (b) export of Ca2+ from the cytosol (c) export of H+ from animal cells for pH regulation (d) the export of Na+from cells to maintain resting membrane potential Ion Channels and the Membrane Potential