In photosynthesis, ATP is made by
A. chemiosmosis.
B. glycolysis.
C. the Krebs cycle.
D. the Calvin cycle.
E. the passing of electrons from photosystem I to an electron transport chain.
A. chemiosmosis.
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Molecular-based phylogies place the phylum Platyhelminthes in the Protostomia. How do scientists best explain the morphological differences between flatworms and the other members of the Lophotrochozoa?
A. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. B. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. C. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time. D. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. E. Some Platyhelminthes have a coelom but others do not and it is difficult to conclude anything about its evolution within the clade.
Choose the correct order of tracheal system structures from most external to most internal
a. spiracles, tracheae, tracheal branches, tracheoles b. tracheoles, tracheae, tracheal branches, spiracles c. tracheoles, tracheal branches, tracheae, spiracles d. spiracles, tracheal branches, tracheae, tracheoles
e. spiracles, tracheoles, tracheae, tracheal branchesWhen one cell goes through cell division, it produces ________.
A. four identical cells B. two different cells C. two identical cells D. four different cells
What cause(s) the synchronization of mass spawning events in many invertebrates?
a. the Sun b. the climate c. cryptochromes d. the stars