In a PET scan, a patient is injected with radioactively labeled glucose. Cells take up the radioactive glucose and the scanner detects levels of radioactivity in various parts of the body. This is a measure of the amount of glucose uptake. Cancer cells are often in an environment with low oxygen concentration and they take in high amounts of glucose. Why would a low oxygen environment lead to
high glucose uptake?
A. They rely more on oxidative phosphorylation which is less efficient than glycolysis.
B. More energy is produced from glucose in hypoxic conditions.
C. They rely more on glycolysis which is less efficient than oxidative phosphorylation.
D. Because they require more oxygen to metabolize glucose.
E. Enzymes function more efficiently in the absence of oxygen.
C. They rely more on glycolysis which is less efficient than oxidative phosphorylation.
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Describe the evolutionary relationship of lancelets to tunicates and to hagfishes. Are lancelets more closely related to tunicates or to hagfishes, or are they equally related?
What will be an ideal response?
A(n) ________ is an example of a mollusc that does not have a shell
A) octopus B) snail C) spider D) oyster
A plant is exposed to a toxin that blocks ABA receptor sites in the plasma membrane. What is the likely consequence of this exposure?
A. The plant will lose excess water through transpiration and suffer dehydration. B. ABA will enter the cells by an alternative route and normal function will be restored. C. Oxygen deprivation will trigger the release of ethylene, which will in turn suppress root growth. D. Gibberellin production will increase, allowing the plant to access more nutrients in the soil. E. The guard cells will become flaccid and gas exchange will cease.
How is a Robertsonian translocation different from a reciprocal translocation?
A. A Robertsonian translocation is unbalanced, and a reciprocal translocation is balanced. B. A reciprocal translocation is unbalanced, and a Robertsonian translocation is balanced. C. Reciprocal translocations occur between whole acrocentric chromosomes, and Robertsonian translocations occur between any two nonhomologous chromosomes. D. Robertsonian translocations occur between whole acrocentric chromosomes, and reciprocal translocations occur between any two nonhomologous chromosomes.