During which phase(s) of urine formation are H+, K+, and urea transported out of peritubular capillaries and into filtrate?
a. tubular secretion
b. glomerular filtration
c. tubular reabsorption
d. all of the choices
a
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Which statement best summarizes the major distinction between horizontal gene transfer and vertical gene transfer?
A. Genes are more stable in recipient cells following horizontal transfer that in those following vertical transfer. B. The recipient of genes in horizontal transfer is a mature cell, whereas the recipient of genes in vertical transfer is a progeny cell. C. Horizontal transfer is observed in bacteria and archaea, whereas vertical transfer is observed in all cells. D. Organisms that use horizontal transfer can only reproduce asexually, whereas organisms that use vertical transfer can reproduce sexually or asexually.
Binding and hydrolysis of ATP in a "cassette" domain is part of the transport mechanism of which of the following types of transporters?
A) ABC type B) type C) P type D) V type E) All of the above are correct.
This is the stage of mitosis characterized by the alignment of the chromosomes in a ring along the inner circumference of the cell:
A. Telophase B. Metaphase C. Prophase D. Interphase
Which of the following ecosystems has a very high net primary productivity?
A. desert B. tropical rain forest C. temperate forest D. boreal forest E. tundra