The process of transcription in eukaryotes ends when
a. exon shuffling mixes mRNA pieces.
b. enzymes recognize a polyadenylation signal in the trailing RNA sequence.
c. the RNA introns are cut out by the spliceosome.
d. an enzyme adds a guanine-containing cap.
e. the RNA exons are spliced together.
B
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A molecule that is organic is primarily composed of:
a. water b. oxygen c. hydrogen only d. carbon only e. hydrogen and carbon
Which of the following organisms is most likely to become fossilized?
a. a lake trout b. a mountain goat c. a tulip d. a mushroom e. all of these organisms are equally likely to fossilize
The first land animals, arthropods, moved onto land about:a
650 million years ago. b. 450 million years ago. c. 250 million years ago. d. 150 million years ago. e. 50 million years ago.
What do all organisms have in common?
a. they use DNA and RNA to pass on information b. they are all prokaryotes c. they are all eukaryotes d. they are genetically identical