The best-known extinction during which all dinosaurs died out completely occurred during the ________ time period
Fill in the blank(s) with correct word
Cretaceous
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What is the purpose of the poly-A tail added to mRNA before it leaves the nucleus?
a. It provides a destination for movement in the cell. b. It notifies the cell that this molecule is “self.” c. It protects against exonuclease activity. d. It provides the final instructions for protein synthesis.
What is the oldest (in other words, most ancient) primate group?
A. Old World monkeys B. Lemurs C. New World monkeys D. Gibbons
Plants store their excess carbohydrates in the
form of
a. cellulose. b. starch. c. glycogen. d. sucrose. e. galactose
Helper T cells release ________, molecules that stimulate the activity of other T cells and macrophages; these chemicals stimulate inflammation as well
Fill in the blank(s) with correct word