The lifeline between the embryo and the placenta ________
A) is derived from the yolk sac
B) is derived from the amnion
C) is called the "chorion"
D) is called the "umbilical cord"
D
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HIV weakens a person's ability to fight off other infections by infecting and destroying helper T cells
Indicate whether the statement is true or false
If a membrane is relatively impermeable to a particular solute that dissolves in water, then water can cross the membrane in the direction of the solute by means of _____
Fill in the blank(s) with the appropriate word(s).
A major reason why fungi can grow and sprout mushrooms so quickly is that:
A) mushrooms are essentially fluid-filled bags and almost entirely water. B) porous connections between cells allow rapid movement of materials toward the growing tips of hyphae. C) fungal spores contain large food reserves. D) fungi cells divide more like bacteria than eukaryotic cells.
A bronchoscopy was performed on a patient who later developed a nosocomial infection as a result of the procedure. The organism recovered from his lung was a nonlactose fermenter that oxidized glucose and maltose, was lysine decarboxylase–positive, and was motile. The organism is most likely which one of the following?
a. Bordetella parapertussis b. Saccharolytic Acinetobacter c. P. luteola d. S. maltophilia