Classify the following explanation as one of Tinbergen's four levels of explanation: "Lactose intolerance is common in hunter-gatherer societies because these human populations did not traditionally have a diet de-rived from the milk of dairy animals."
a. proximate c. evolutionary
b. developmental d. phylogenetic
D
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In the DNA ligase reaction, the lysine residue:
A. serves as the nucleophile displacing the phosphate group 3' to the nicked site. B. serves as the electrophile displacing the phosphate group 3' to the nicked site. C. remains phosphorylated after the ligase reaction. D. serves as a nucleophile, which displaces the pyrophosphate from ATP. E. remains bound to AMP, ready to repeat the reaction.
A transport system that moves one solute into the cell and another one out of the cell during a single cycle accompanied by the expenditure of energy through ATP hydrolysis could be called a(n) _______
a) active uniport b) active antiport c) active symport d) passive symport e) passive antiport
What are lysosomes, and how do they work in the cell?
What will be an ideal response?
If light strikes a photopigment, the photoreceptor cell will decrease the amount of ________ it is releasing
Fill in the blank(s) with correct word