Based on information in the figure above, why do individuals with kidney disease sometimes become anemic?
A) The diseased kidneys destroy circulating red blood cells.
B) The diseased kidneys do not secrete adequate erythropoietin.
C) Excessive red blood cells are lost in the urine due to leaky filtration in the diseased kidneys.
D) Kidney disease spreads to the bones and interferes with red blood cell production.
B
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The protein of T2 bacteriophage is labeled with 35S and the DNA with 32P. Where would one detect most of the 32P if the T2 bacteriophage were allowed to infect the bacteria?
A. on the phage coat surrounding the T2 bacteriophage B. on the membrane of the infected bacteria C. inside the T2 bacteriophage capsid D. inside the infected bacteria E. The 32P would be equally distributed within the T2 bacteriophage and infected bacteria.
Which of the following describes the difference between fungal endomycorrhizae and fungal endophytes?
A. Endomycorrhizae live inside fungi and provide them with nutrients and water, and endophytes live inside plants, often parasitizing them and slowly breaking down their structure. B. Endomycorrhizae form arbuscules that facilitate exchanges of water and food between the fungus and plant root cells, whereas endophytes invade plant cells and provide the plant with protective antibiotics and toxins. C. Endomycorrhizae are beneficial to its host plant but endophytes harm the host plant. D. Endomycorrhizae form arbuscules on plant roots that produce toxins killing parasitic nematodes, whereas endophytes assist in the transport of water through the plant. E. None of these are correct.
Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?
A. Cells continue to grow as long as there is adequate space. B. The controls on cell growth and division can be turned on and off. C. When cells come into contact with other cells, they stop growing. D. Cell division can be regulated by factors outside of the cell. E. All of the answer choices are correct.
Which of the following techniques involves hybridizing a cDNA sample to a chip containing thousands of single-stranded DNA sequences, allowing one to study the expression of thousands of genes simultaneously?
A) PCR B) Southern blot C) FISH D) Agarose gel electrophoresis E) DNA microarray