It is estimated that there are a total of 50-100 trillion cells in a human body. Starting from a fertilized egg, how many cell divisions would be required to produce 50 trillion cells, assuming that every cell divides in every cycle?
A. 455 divisions
B. 45.5 divisions
C. 50-100 divisions
D. one division per day for nine months
B
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Which of the following statements about activation energy is not true?
A. The activation energy of a reaction is lowered by enzymes. B. The activation energy is the difference between the energy level of the ground state and the transition state. C. The activation energy is the difference between the free energy of the product of the catalyzed and uncatalyzed reaction. D. The activation energy represents an energy barrier to the transition from substrate to product. E. Activation energy is related to the rate of the reaction.
When examining the hierarchy of life, which of the following terms is most inclusive?
a. population b. species c. biosphere d. ecosystem e. population
Which of the following best describe the cells that result from the process of meiosis in mammals?
A. They are diploid B. They can be used to repair injuries C. They are genetically different from the parent cell D. They are genetically identical to all the other cells in the body E. They are idenctical to each other
The attachment protein for almost all rhinoviruses is (BCG/ICAM-1/IgA). (Be sure your answer is in uppercase letters.)
What will be an ideal response?