The dead brown spots on these leaves
are sites where a pathogen invaded and triggered the defensive destruction of surrounding cells. This is an example of which type of defense?
1.activation of heat-shock proteins
2.increased production of terpenes
3.systemic acquired resistance
4.the hypersensitive response
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Hooker’s evening primrose keeps its flowers
closed until the early evening when they open. This is an example of
a. phototropism. b. vernalization. c. a circadian rhythm. d. photoperiodism. e. apical dominance
Which of the following would protect a plant from water loss on a hot, sunny day?
A. phloem and stomata B. cuticle and stomata C. cuticle and phloem D. stomata E. cuticle
A(n) ______carrier actually spreads infectious agents during the period immediately prior to the appearance of symptoms
a. chronic b. convalescent c. asymptomatic d. incubation e. passive
Pre-mRNA is ____________________ and ____________________ before it becomes mRNA and
moves to the cytoplasm. Fill in the blank(s) with the appropriate word(s).