In the diagram of a root tip shown above, the item labeled "5" is the
a. quiescent center.
b. zone of cell division.
c. zone of elongation.
d. root cap.
e. zone of maturation.
C
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According to Stern's experiment described in Figure 6.17, which one of the following enzymes was shown to form an intermediate complex with its substrate(s)?
A. -galactosidase B. pepsin C. DNA polymerase D. lysozyme E. catalase
The urinary tract above the bladder usually shows
A. Escherichia coli. B. Staphylococcus aureus. C. Proteus vulgaris. D. no bacteria. E. Escherichia coli AND Staphylococcus aureus.
What compound served to contain interacting organic molecules within a protocell?
a. RNA b. DNA c. lipids d. single amino acids e. amino acid polymers
Reabsorption of water and essential solutes
occurs in the region labeled
a. 1. b. 2. c. 3. d. 4. e. as none of these.