Which statement is NOT true about woody stems?
A. Cork cambium produces waterproof cork cells that become bark.
B. The vascular cambium is located between the xylem and phloem of the vascular bundles in a woody stem.
C. The stem is organized into a central pith, wood, and outer bark.
D. Secondary phloem accumulates to form the wood.
E. Woody stems contain secondary growth.
Answer: D
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Choose the true statements about the human and tiger pufferfish genomes.
_____ Genes regulating the basic cellular metabolism are conserved in both human and pufferfish genomes. _____ About 25% of the human genes have no counterpart in the pufferfish genome. _____ Being ancestral to humans, the pufferfish genome has more repetitive DNA than the human genome does. _____ The pufferfish genome has twice the amount of DNA as the human genome does.
Which of the following it the most typical order of events in seed germination?
a. shoot cells divide and elongate ? root cells divide and elongate ? seed coat splits ? water imbibition b. water imbibition ? seed coat splits ? root cells divide and elongate ? shoot cells divide and elongate c. water imbibition ? root cells divide and elongate ? seed coat splits ? shoot cells divide and elongate d. seed coat splits ? water imbibition ? root cells divide and elongate ? shoot cells divide and elongate e. seed coat splits ? water imbibition ? shoot cells divide and elongate ? root cells divide and elongate
What is the function of a fish's operculum?
A) Detects biofields in the immediate vicinity B) Detects movements in the surrounding water C) Protects the gills D) Provides buoyancy
Mating preferences drive assortative mating:
a. all of the time. b. none of the time. c. some of the time. d. every other time. e. in selfing plants.