A segment of DNA that specifies a sequence of amino acids in a polypeptide is called a(n) ____________.
A. codon
B. intron
C. messenger
D. gene
E. enzyme
Answer: D
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Vertebrates and tunicates share _____
A) jaws adapted for feeding B) a high degree of cephalization C) the formation of structures from the neural crest D) an endoskeleton that includes a skull E) a notochord and a dorsal, hollow nerve cord
A scientist wants to study histones. Histones are:
A. proteins that double-stranded DNA molecules wrap around in prokaryotes and eukaryotes. B. proteins that double-stranded DNA molecules wrap around in eukaryotes. C. proteins that required for the activity of Cdk enzymes. D. proteins that regulate checkpoints in the mitotic cell cycle. E. proteins that serve as the spindle fiber to pull sister chromatids apart during anaphase.
Which of the following features is absent in lancelets?
A) Gill slits B) Tail C) Nerve cord D) Notochord E) Backbone
When sunlight hits chlorophyll, the electrons are excited out of the chlorophyll; the electrons go ________ an energy hill, and as they pass through the electron transport chain they go ________ an energy hill
Fill in the blank(s) with correct word