The leaf of a plant is
A. a molecule.
B. an organism.
C. an organ.
D. an organelle.
E. a cell.
C. an organ.
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Which of the following is not true of cloning vectors?
A. They contain at least two replication origins. B. They can be replicated within an appropriate host. C. They usually contain multicloning sites or polylinkers. D. All of these are true of cloning vectors.
A plant stoma is found between two ____
a. leaves b. root hairs c. xylem veins d. trichomes e. guard cells
Microorg. are spread in hospitals through which route?
A. direct contact in contaminate food or intravenous solutions B. indirect contact from patient to patient on the hands of health care workers C. Inhalation of droplets D. vector-borne contact E. all of the above are correct
What describes marsupial embryos?
A. They are nourished by the placenta. B. They hatch from an externally laid egg. C. They hatch from an internal egg. D. They are born fully developed. E. They are born highly underdeveloped.