The human gene for a protein hormone has been isolated. Scientists want to introduce this gene into a bacterial host, modifying the bacteria so that it can be used to produce this hormone. After successfully introducing the gene on a plasmid, the bacteria produced the protein hormone, but the protein was defective, longer than normal, with intervening stretches of amino acids not found in the native protein. What is the most likely explanation?
A. The bacteria can't transcribe the human gene.
B. Bacterial ribosomes make errors when transcribing human mRNAs.
C. The gene that was introduced contained introns.
D. Bacterial cells cannot translate mRNAs transcribed from human genes.
Answer: C
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Which of the following could explain how 14 genes for globins, each specialized in their function (i.e., hemoglobin, myoglobin), arose in the genome?
A. misaligned crossover B. gene deletion C. gene mutation D. misaligned crossover and gene mutation E. misaligned crossover and gene deletion
Our understanding of the evolutionary process reveals that ____
a. favorable traits become less common in future generations b. all populations are related through a shared ancestry c. evolution has produced the spectacular diversity of life on Earth d. all organisms change through time e. development has produced the spectacular diversity of life on Earth
Tunicates, members of one major class of the ____ lineage, have tadpolelike larvae, but their sessile adult forms are
usually encased in a leathery "tunic."
a. Petromyzontoidea b. Placodermi c. Cephalochordata d. Urochordata e. Myxinoidea
Complete reproductive isolation is evidence that
what has occurred? a. extinction b. speciation c. polyploidy d. hybridization e. gene flow