Which of the following elements is considered an essential micronutrient for plants?
a. calcium
b. lithium
c. sulfur
d. nickel
e. oxygen
D
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Which of the following relationships is INCORRECT?
A. maternal effect genes activate gap genes B. gap genes activate pair-rule genes C. pair-rule genes regulate segment polarity genes D. segment polarity genes regulate pair-rule genes E. maternal effect genes activate pair-rule genes
T cells will begin to secrete cytokines when
bound to which of the following?
a. a MHC-antigen complex b. a receptor-antigen complex c. an antigen directly bound to the surface of a transport vesicle d. an antigen directly bound to the surface of a macrophage only e. another T cell only
Antioxidants are believed to:
A) generate free radicals B) cause cancer C) destroy free radicals D) break down vitamins E) break down hydrogen peroxide
Bacterial ____ may be used as cloning vectors.
A. transcriptase B. ligase C. endonuclease D. plasmids E. polymerase