In which plant cell or tissue would the pressure component of water potential most often be negative?
A) leaf mesophyll cell
B) stem xylem
C) stem phloem
D) root cortex cell
E) root epidermis
Answer: B
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The primary role of bile salts during digestion is ____
a. osmoregulation b. to kill bacteria that may have been consumed c. to coat fat droplets and separate them into small droplets d. to drive the enzymatic digestion of fats e. to drive the enzymatic digestion of proteins
At a neruomusclular junction involving skeletal muscle, the acetylcholine receptor is a ______ channel.
A. voltage-gated Na+ B. anion C. cation D. two of the above
Much of the world's coal reserves were formed from the buried remains of the dominant plants of the Carboniferous period. What were the dominant plants of the period?
a. gymnosperms and angiosperms b. angiosperms only c. gymnosperms only d. seedless vascular plants
For water to leave a kidney tubule by osmosis, the interstitial fluid around that region of tubule must be ____ relative to the filtrate inside the tubule.
A. hypertonic B. hypotonic C. isotonic D. osmotic E. permeable