Homologous structures are found in organisms that share a common ancestry. They can be used to classify organisms. However, homologous structures may have different functions. Which of the following is an example of a homologous structure?
A) embryonic stages of development
B) human tail bone
C) human appendix
D) forelimbs of vertebrates
Ans: D) forelimbs of vertebrates
You might also like to view...
You isolate a purify a bacteriophage that can replicate in E. coli. Through chemical analyses you determine that the only nucleic acid present is RNA
You isolate the RNA and put it in a test tube with all of the necessary proteins and RNAs for translation. The RNA is translated and new infectious virions are made. What does this tell you about the bacteriophage? A) The RNA genome is of the plus sense. B) The RNA genome is of the plus sense and RNA replicase is present in the viral capsid. C) The new bacteriophage is a retrovirus. D) RNA replicase is present in the viral capsid.
Treatment of gas gangrene may involve ________.
A. antitoxins B. wound debridement C. hyperbaric chambers D. All of the choices are correct.
_______ inject their genetic material into a cell, leaving their capsid in the extracellular space.
a. RNA viruses b. DNA viruses c. Virions d. Bacteriophages
In Seymour Benzer's studies, if he mixed two RII phage together (co-infection studies in K12 ) and the resulting phage always failed to lyse K12 ________
A) the two mutants were in different cistrons B) the two mutants were in the same cistron C) the two mutants complemented each other D) the two mutants failed to infect bacteria E) the two mutants represented mutations in both A and B