What type of water-conducting cells has perforation plates on their ends?
a. tracheids
b. vessel elements
c. sieve elements
d. companion cells
e. sieve tubes
ANSWER: b
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Four of the five answers listed below are
members of the same group. Select the EXCEPTION.
a. amoeba b. clostridium c. euglena d. water molds e. ciliates
The compound magnesium chloride (MgCl2 ) turns into one Mg2+ and two Cl- when placed in water. You can guess that the Mg and Cl atoms are held together normally by a(n) ________ bond
A) covalent B) electronegative C) hydrogen D) ionic
Water is an end product in
A.) lactic acid fermentation. B.) alcoholic fermentation. C.) the Krebs cycle. D.) the electron transport chain in aerobic respiration.
Toxicants that cause harm by triggering over activation of the immune system are called ___.
a. neurotoxins b. teratogens c. allergens d. antibiotics