You are at the aquarium looking at a freshwater mammal tank and an adult manatee swims close to the glass. On his front flippers you see fingernails. What is a likely explanation for the presence of fingernails on a manatee?
A. They are analogous to bear claws.
B. They are a developmental homology.
C. They are analogous to human fingernails.
D. They are homologous to fish fins.
E. They are vestigial structures.
Answer: E
You might also like to view...
Match the following items with the correct phrases.
_______1. A protein that plays a role in DNA replication. _______2. The end product of transcription. _______3. A protein that plays a role in transcription. _______4. The location of codons. _______5. The location of anticodons. _______6. An integral part of ribosomes, whether or not they are participating in protein synthesis. _______7. Produced in the nucleolus of eucaryotic cells. _______8. The molecule responsible for “activating” amino acids, thus enabling them to be added to the growing polypeptide chain. a. DNA polymerase b. RNA polymerase c. mRNA d. rRNA e. tRNA
Organisms
A. may be classified in four domains. B. may be classified in three domains. C. probably do not have a common ancestor. D. have never shared genes between domains. E. may be classified in three domains, probably do not have a common ancestor, AND have never shared genes between domains.
In skeletal and cardiac muscles, relaxation occurs as ________ ions are pumped back into the sarcoplasmic reticulum
A) potassium B) sodium C) chloride D) calcium
In the loop dilution method, which plate will contain the greatest number of colonies?
A) I B) II C) III