Refer to Figure 31-5. What is the function of the structure labeled 6?
A. circulation
B. reproduction
C. digestion
D. movement
E. respiration
A
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Which of the following can waterproof cell walls, allowing for structures such as watertight conduction channels?
a. lignin b. hemicelluloses c. pectin d. cellulose e. chitin
Ribosomal RNA:
A) is a double-stranded helix B) may act a ribozyme during protein synthesis C) retrieves amino acids and brings them to the ribosome for incorporation into a growing protein D) may have double stranded regions due to hairpin loop formations E) carries the genetic
Most of the oxygen in the blood is transported by ____.
A. erythropoietin B. prothrombin C. platelets D. hemoglobin E. leukocytes
Media that contains extracts from plants, animals, or yeasts are
A. complex. B. synthetic. C. enriched. D. reducing. E. All of these choices are correct.