Decapod crustaceans (shrimps, lobsters, and crabs) all lack
A. chelicerae.
B. a carapace, a dorsal cephalothorax shield.
C. a tail spine, telson.
D. a ventral line of appendages, swimmerets.
Answer: A
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Paedomorphosis is
A. the formation of limbs from fins in the evolution of land vertebrates. B. the change from radial to bilateral symmetry in the evolution of plants and animals. C. the retention of juvenile traits in an adult organism. D. an earlier development of adult traits in an organism. E. the development of different types of eyes from a simpler form.
The term that refers to the presence of a tuft of flagella emerging from a single site is ________.
A. amphitrichous B. atrichous C. lophotrichous D. peritrichous E. monotrichous
If the 14C to 12C ratio present in a fossil is 25% of that in living organism, how many years have passed since this
fossilized organism died?
a. 1,432 b. 2,865 c. 5,730 d. 11,460 e. 17,190
A transgene is a
A) hybrid gene. B) gene that contains no introns. C) bacterial gene that is found in mammalian cells. D) human gene of viral origin. E) gene introduced into an organism by artificial means.