To prevent disastrous consequences, the eukaryotic cell cycle is controlled by:
a. the mitochondria.
b. replication.
c. environmental signals.
d. a very detailed, rigid genetic program.
e. a series of cell cycle checkpoints
e
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The first sign of PKU in newborns is abnormally high levels of ____________________ in the blood and urine
Fill in the blank(s) with correct word
Which of the following is true regarding chronic
bronchitis? a. It is a leading cause of lung cancer. b. The lungs become elastic. c. It can lead to emphysema. d. The alveoli shrink. e. All of these are true.
Which gas was the least abundant in the earth's atmosphere 3.5 billion years ago?
A. oxygen B. nitrogen C. carbon dioxide D. carbon monoxide
In the process of scientific inquiry one must make a hypothesis and a prediction, what is the difference between the two?
A. A hypothesis is the question the experiment is trying to answer and a prediction is a general statement or default position that there is no relationship between two measured phenomena. B. A prediction leads to the formulation of a hypothesis. C. A hypothesis and a prediction are the same thing D. A hypothesis is an explanation that makes a testable prediction and predictions describe observable outcomes of particular conditions.