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

Biology & Microbiology

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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.

Biology & Microbiology

What is the oldest (in other words, most ancient) primate group?

A. Old World monkeys B. Lemurs C. New World monkeys D. Gibbons

Biology & Microbiology

Plants store their excess carbohydrates in the

form of

a. cellulose. b. starch. c. glycogen. d. sucrose. e. galactose

Biology & Microbiology

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

Biology & Microbiology