Of the different sources of genetic variability which one causes the variation in the combinations of homologs from paternal and maternal linage found within a haploid cell?
A) independent assortment
B) crossing over
C) random fertilization
D) mutation
A
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Which organs function to remove old, worn out red blood cells?
A. Liver and kidney B. Liver and bone marrow C. Liver and spleen D. Spleen and kidney
Identify the mismatched pair
A) receptor proteins—bind to extracellular ligands B) channel proteins—provide passageway for ions C) recognition glycoproteins and glycolipids—identify the cell as "self" D) carrier proteins—allow a cell to move E) enzymes—speed up chemical reactions
Water reabsorption cannot occur from any portion of the nephron in the absence of vasopressin
Indicate whether the statement is true or false
When drawing a graph to display experimental data, the independent variable is plotted along the x-axis.
Answer the following statement true (T) or false (F)