A plant's first line of defense against infection is

A) cell elongation.
B) its epidermis.
C) phytochrome.
D) salicylic acid.


Answer: B

Biology & Microbiology

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Chromosomes exchange genetic information by  

A.  fertilization. B.  mitosis. C.  syngamy. D.  DNA replication. E.  crossing over.

Biology & Microbiology

What chemical group is found in a nucleotide but not in a nucleoside?

A.)sugar B.) nitrogen containing base C.) pentose D.) hydroxyl group E.) phosphate

Biology & Microbiology

Inbreeding will change ________

A) diet B) mating isolation mechanism C) species D) gene frequencies

Biology & Microbiology

A drawback of the morphospecies concept is that it cannot be applied to:

A. polymorphic species. B. species that are very similar in appearance. C. extinct organisms (e.g., fossils). D. polymorphic and similar-looking organisms. E. all of the answer options are correct.

Biology & Microbiology