Darwin and Wallace were the first to propose _____
A) that evolution occurs
B) a mechanism for how evolution occurs
C) that Earth is older than a few thousand years
D) natural selection as the mechanism of evolution
D
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Which of the following statements about childbirth is false?
A. Babies are usually born head first with the face pointing upward. B. The placenta is expelled as a result of muscular contractions of the uterus. C. The baby goes through a series of movements to facilitate its passage through the pelvis. D. Caesarian sections involve the removal of the baby through an incision in the abdomen and uterus. E. None of the answer options is false.
When the concentration of a ligand is equal to the KD which of the following is true?
A. All of the receptors are bound to ligands. B. Half of the receptors are bound to ligands. C. All of the ligands and receptors are bound to each other. D. All of the ligands are bound to receptors. E. Half of the ligands are bound to receptors.
A child swinging on a swing utilizes which type (or types) of energy?
a. kinetic energy only because the child is in constant motion b. potential energy only, because the child has to invest energy to get the swing to go c. chemical energy only, because it is the child's metabolism that powers the muscles that make the swing move d. kinetic and potential energy only, but in constantly changing ratios: when changing direction it is pure potential energy; at the bottom of the arc, it is pure kinetic energy e. kinetic, potential, and chemical energy. The child powers the swing with chemical energy in the muscle cells and the swing moves like a pendulum with changing ratios of kinetic and potential energy.
A recombinant cell
1)is a cell that receives DNA from an outside source and incorporates it into its own. 2).donates DNA into a new cell. 3).is the result of a cell dividing.