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

Biology & Microbiology

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Four of the five answers listed below are

members of the same group. Select the EXCEPTION.

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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

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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.

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Toxicants that cause harm by triggering over activation of the immune system are called ___.

a. neurotoxins b. teratogens c. allergens d. antibiotics

Biology & Microbiology