Imagine an insect that is making its way from the outside of a tree to the inside of the tree. Put the layers that it would it encounter in order, starting with the outermost later.
a. Secondary xylem.
b. Primary xylem and pith.
c. Cork cambium.
d. Cork.
e. Remains of primary and older secondary phloem.
a. 4
b. 5
c. 2
d. 1
e. 3
Biology & Microbiology
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Which of the following organisms is used in
the genetic engineering of plants?
a. E. coli b. T. aquaticus c. A. tumefaciens d. P. flourescens e. B. thuringiensis
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The preassembled carbohydrate tree is added on_____ residue
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
Cytoskeletal elements are found in the
A) Eubacteria. B) Archaea. C) Eukarya. D) choices B and C only E) all of the above
Biology & Microbiology
When the immune system is activated by a normally harmless antigen, this is called
a. an allergy. b. an innate response. c. a complement response. d. cytotoxic cell response.
Biology & Microbiology