What element is considered an essential macronutrient for plants?

a. zinc
b. uranium
c. iron
d. nickel
e. carbon


ANSWER: e

Biology & Microbiology

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The elongation of stems is stimulated by  

A.  auxin only. B.  gibberellin only. C.  ethylene only. D.  auxin and gibberellin. E.  auxin and ethylene.

Biology & Microbiology

What is the structure labeled B in the accompanying figure?

a. cytoplasm b. nucleoid c. plasma membrane d. capsule e. pilus

Biology & Microbiology

The condition in which it takes larger or more frequent doses to produces the same effect is drug ____

a. tolerance b. addiction c. habituation d. concealment e. depression

Biology & Microbiology

Members of phylum Ctenophora are diploblastic but lack cnidocytes

____________________ Indicate whether the statement is true or false.

Biology & Microbiology