If two sister species on the phylogenetic tree above differ from the other two in a single character state (say dark or light fur), how many character state changes (evolutionary events) are needed to explain this pattern?
a. one c. three
b. two d. four
A
Biology & Microbiology
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When several ribosomes translate the same mRNA they are called ________
a. polysomes b. polypeptides c. codons d. mutations e. polysaccharides
Biology & Microbiology
What formula correctly represents the behavior of CO2 in the blood?
A. CO2 + H2O « H2CO3 « HCO3- + H+ B. CO2 + H+ « HCO3+ « H2O + H2CO3 C. CO2 + H2O « H2CO3 + CO D. CO2 + H2CO3 + O2 « H2O + CO2 + H2CO3 E. CO2 + HCO3- « H+ + H2O + H2CO3
Biology & Microbiology
Compare and contrast monotremes and Metatheria (marsupials). Identify two representatives of each group. What will be an ideal response?
Biology & Microbiology
Which fetal blood vessels carry oxygen-poor blood to the placenta?
Biology & Microbiology