Which structure selectively regulates the transport of substances into and out of a plant cell?
A. The chloroplast
B. The nucleus
C. The cell wall
D. The plasma membrane
Answer: D
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Ti plasmids in the species Agrobacterium tumefaciens
A. carries the genes needed for formation of bacteroids. B. is required for nitrogen fixation. C. causes the formation of tumors. D. carries the genes needed for root nodule development.
Reptiles and birds differ from amphibians in that they lack a free larval stage. What adaptation allowed the elimination of this stage?
What will be an ideal response?
Each of the following are true of enzymes except
A. their action may involve minerals. B. they can be used over and over. C. they may or may not require cofactors. D. they increase the activation energy of a reaction. E. their active site is specific to the substrate.
Birds are most closely related to
A. crocodiles. B. snakes. C. mammals. D. non-avian dinosaurs. E. amphibians.