Hepatitis B infection
A) Increases risk for hepatocellular cancer
B) Can be transmitted by the fecal-oral route
C) Has an incubation of 1 to 3 weeks
D) All of these choices are correct
E) Is due to a flavivirus
A) Increases risk for hepatocellular cancer
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After fertilization, the zygote grows through a series of cell divisions called cleavage. The embryo does not grow in size although the cell number is increasing. How does this happen?
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Why do you have to use an oven to transform batter into a cake?
What will be an ideal response?
After a muscle cell contracts, which of the following must occur for the muscle to stop contracting?
A. Calcium ions must be pumped back into the endoplasmic reticulum. B. Calcium ions must flow out of the endoplasmic reticulum. C. Calcium ions must flow into the muscle cell. D. Calcium ions must flow out of the muscle cell. E. Calcium ions must be pumped out of the muscle cell.
Which of the following statements is NOT
TRUE concerning an electron that has absorbed a photon? a. It moves to a higher energy level. b. It becomes more stable. c. It quickly returns to its original energy level. d. It may emit energy. e. It becomes excited