Primordial germ cells can be found in the ________ of the developing female embryo
A) yolk sac
B) chorion
C) allantois
D) placenta
A
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The association of four subunit peptides in a fully functional molecule of hemoglobin is a good example of ____ protein structure
a. primary b. secondary c. tertiary d. quaternary e. aggregate
Chart the path of food through the human digestive system. What will be an ideal response?
Where does the second stage of aerobic respiration take place?
A.) mitochondria B.) cytoplasm C.) outside of the cell D.) muscles
Which of the following statements does NOT describe a function of the cell walls of bacteria?
A. They avoid disintegration in water with low concentrations of salt. B. They protect against other bacteria. C. They protect against viruses. D. They maintain cell shape. E. They prevent horizontal gene transfer.