The 3' cleavage and polyadenylation of mRNA is partly defined by the sequence:
A. AAUAAA.
B. AAAAAA.
C. CCCGGG.
D. GCGCGC.
A
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If you pick up a handful of soil from your garden, everything you are holding in your hand
represents a(n) __________.
a. organism b. population c. community d. ecosystem
Monocots and eudicots differ in how xylem and phloem are distributed in ground tissue, in the number
of petals in flowers, and in the number of __________. Fill in the blank(s) with the appropriate word(s).
Indicate the order of cell types involved in the response to the first exposure to an allergen.
A. B cell, helper T cell, antigen-presenting cell, plasma cell B. Antigen-presenting cell, helper T cell, B cell, plasma cell C. plasma cell, antigen-presenting cell, helper T cell, B cell D. antigen-presenting cell, B cell, plasma cell, helper T cell
The valence of an atom represents its
A) ability to interact with other atoms. B) electronegativity. C) radioactivity. D) ability to attract electrons. E) ability to interact with water.