Which components of the cytoskeleton allow the cell to resist damage from stretching forces?
a. microfilaments and microtubules
b. intermediate filaments and microtubules
c. microfilaments and intermediate filaments
d. only intermediate filaments
c. microfilaments and intermediate filaments
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Th2 cells produce a cytokine that promotes growth and activation of other T cells and activates macrophages
Indicate whether the statement is true or false.
What is the natural function of restriction endonucleases?
a. research applications
b. DNA manipulation in vitro c. defense against viruses that infect bacteria d. regulating bacterial gene expression e. breaking phosphodiester bonds in mammalian DNA
The male gametophyte in flowering plants forms in a ____
a. corolla b. receptacle c. stamen d. calyx e. carpel
The nerve gas Sarin kills by blocking
acetylcholinesterase, an enzyme that degrades acetylcholine. What effect does this have? a. ACh breakdown stops. b. It results in paralysis of skeletal muscles, confusion, and slurred speech. c. Signals for breathing may be disrupted. d. ACh breakdown stops, and signals for breathing may be disrupted. e. ACh breakdown stops; paralysis of skeletal muscles, confusion, headache, and possibly death