The first living cells were probably eukaryotic
1.True
2.False
2
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Where are choanocytes found?
a. in humans b. in birds c. in earthworms d. in sponges
Consider the equilibrium established in the carbonic acid-bicarbonate buffer system, which maintains pH balance in
mammalian blood:H2CO3 ? HCO3- + H+ During hypoventilation, breathing rate decreases, and therefore elimination of CO2 during exhalation decreases. How is optimal blood pH maintained when acid levels increase in our blood from hypoventilating?
a. excess H+ from the acid react with H2CO3 to decrease pH level b. excess H+ from the acid react with H2CO3 to increase pH level c. excess H+ from the acid react with H2CO3 to maintain pH level d. excess H+ from the acid react with HCO3- to increase pH level e. excess H+ from the acid react with HCO3- to maintain pH level
At its most basic level, evolution is a:
A) change in an individual's phenotype caused by mutations. B) change in the frequency of alleles in an individual. C) change in the frequency of alleles in a population. D) new species arising from an existing species.
During a laboratory experiment, you discover that an enzyme-catalyzed reaction has a ?G of -20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the ?G for the new reaction?
A) -40 kcal/mol B) -20 kcal/mol C) 0 kcal/mol D) +20 kcal/mol E) +40 kcal/mol