Which of the following elements is considered an essential micronutrient for plants?

a. calcium
b. lithium
c. sulfur
d. nickel
e. oxygen


D

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Antioxidants are believed to:

A) generate free radicals B) cause cancer C) destroy free radicals D) break down vitamins E) break down hydrogen peroxide

Biology & Microbiology

Bacterial ____ may be used as cloning vectors.

A. transcriptase B. ligase C. endonuclease D. plasmids E. polymerase

Biology & Microbiology