A difference in charge across a guard cell membrane is called ____.

A. osmosis
B. tension
C. turgor
D. pressure gradient
E. voltage


Answer: E

Biology & Microbiology

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The sirtuin, resveratrol, is a natural component of

A) turtle soup. B) owl meat. C) cigarette smoke. D) red wine.

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In many parts of the Everglades in Florida, excessive irrigation is lowering water levels and allowing salt water to enter the freshwater swamps. Why is this a problem for plants that have adapted to life in these swamps?

A. Photosynthesis is inhibited by salt. B. The plant roots cannot take up water if the soil salt concentration is high. C. The salt competes with minerals for uptake by the plants, limiting their growth. D. The plants cannot move sugars down the xylem if there is salt outside of the roots pulling water out. E. Salts bind to nitrogen, preventing it from being taken up.

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Which of the following is an example of a protein that is inhibited when bound to its regulatory subunit(s) but becomes active when free?

a. Adenylyl cyclase b. cAMP-dependent protein kinase c. Protein kinase C d. Phosphorylase kinase

Biology & Microbiology

How would an earthworm stretch its body to reach a patch of dirt after crossing a hot sidewalk?

A. Relaxing the chaetae (setae) B. Contraction of the longitudinal muscles C. Contraction of the circular muscles D. Pulling on the chaetae (setae)

Biology & Microbiology