Which steps compose a plant’s triple response to ethylene?
A. Seedlings bend toward the sun, seedling stem thickens, and the seedling stem bends, forming a hook.
B. Seedling stem stops elongating, seedling stem thickens, and the seedling stem bends, forming a hook.
C. Seedling stem stops elongating, seedling stem thickens, and the seedling undergoes apoptosis.
D. Seedling bends away from the sun, seedling stem thickens, and the seedling stem bends, forming a hook.
B. Seedling stem stops elongating, seedling stem thickens, and the seedling stem bends, forming a hook.
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Amplification is an important characteristic of signal transduction pathways involving surface receptors. What is
amplification and how is it accomplished in the cell?
What will be an ideal response?Which of these structures is NOT derived from the neural crest?
a. bones of inner ear b. cartilage of the face c. cranial nerves d. teeth e. muscles
Smoking tobacco regularly during pregnancy results
in all EXCEPT a. increased risk of miscarriage. b. newborns of lower birth weight. c. reduced vitamin C levels for the mother-to-be and for her fetus. d. fetal facial and cranial deformities. e. higher incidence of fetal heart defects.
Assume that a plant is suffering from drought and is beginning to wilt. Which cell component is most likely being affected, and what type of molecule is being lost from this structure?
A) endoplasmic reticulum; protein B) Golgi apparatus; water C) lysosome; enzymes D) vacuole; water