Characid fishes are found naturally only in South America and Africa. Fossils of these fish are not found on any other continents. What is the most likely explanation of this distribution pattern?
A) These fishes arose in either Africa or South America and migrated across the South Atlantic Ocean to the other continent.
B) Characid fishes arose prior to the separation of the African and South American continents.
C) Characid fishes arose in the South Atlantic Ocean and migrated to Africa and South America.
D) Convergent evolution is responsible for the distribution of characid fishes.
B
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Deafness is caused by recessive mutations in any one of at least five genes. Two deaf individuals have nine children, all of whom have normal hearing. Which of the following can you conclude?
A) The parents have mutations in the same gene. B) The parents have mutations in different genes. C) An epistatic interaction has occurred. D) The mutations are codominant to the normal allele. E) The mutations are incompletely dominant to the normal allele.
he specificity of viruses to different types of cells is due to __________ sites on the host cell
a. prophage b. receptor c. transduction d. penetration e. transcription
Overexpression of ________, which bind to and silence mRNAs, may lead to the development of cancer
Fill in the blank with correct word.
C6H12O6 + C6H12O6 ? C12H22O11 + H2O is an example of
A. a hydrolytic reaction. B. denaturation. C. formation of a peptide bond. D. a decomposition reaction. E. dehydration synthesis.