A gene can be mutated with no resulting functional change in the protein that is produced from that gene if
A) an entire codon has been removed.
B) a codon has changed, but it codes for the same amino acid as the original codon.
C) the mutation alters the active site of an enzyme.
D) RNA polymerase can edit the mutation from the mRNA produced during translation.
B
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Why did internal fertilization likely evolve?
A. To increase the chances of successful fertilization. B. As a response to copulation. C. Because there were no safe places to lay eggs. D. As an adaptation to life in a terrestrial environment.
In a receptor tyrosine kinase, formation of the dimer is initiated by
1.two receptor molecules each binding a signal molecule. 2.binding of phosphates to tyrosines on the cytoplasmic segment of the receptors. 3.activation of the protein kinase sites on the receptor. 4.receptor autophosphorylation. 5.activation of cellular proteins.
You observe that two sympatric species occupy different ecological niches. What kind of barrier originally caused their speciation?
A. prezygotic B. not enough information C. postzygotic
Which of the following is NOT true of the cell theory?
A. New cells are built from recycled components of old, dead cells B. New cells originate from pre-existing cells by cell division C. The cell is the smallest unit of life D. All of the above ARE true