Saber teeth found in different groups of extinct carnivorous mammals are considered ________ structures, as the fossil record shows that saber teeth evolved independently among the groups.
Fill in the blank(s) with the appropriate word(s).
homoplastic
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____ are the most diverse animal phylum and ____ are the most diverse animals in this phylum
a. Cnidaria; insects b. Arthropods; crustaceans c. Echinoderms; insects d. Birds; ducks e. Arthropods; insects
Fossils older than ____ cannot be dated by their 14C content because ____
a. 60,000 years; most of the 14C has decayed by this time b. 12,000 years; half of the 14C has decayed by this time c. 6,000 years; older fossils do not contain carbon d. 2,000 years; most of the 14C has decayed by this time e. 500 years; half of the 14C has decayed by this time
Most of the energy for active transport is provided by
a. glucose. b. sodium. c. calcium. d. ATP. e. ADP.
What is the role of the ribosome in protein production?
A) It reads the DNA to make an RNA molecule. B) It folds the protein into the correct shape. C) It is where proteins are made. D) It has no direct role in protein production.