Which of the following describe the placenta? (Check all that apply.)  

_____  The bloods of the mother and the embryo come in close contact without mixing.
_____  The placenta neutralizes toxins like alcohol and drugs before they reach the fetus.
_____  Oxygen diffuses from the mother to the embryo.
_____  Carbon dioxide diffuses from the embryo to the mother.
_____  The placenta provides nourishment and hormones to the embryo.
_____  The antibodies made in the embryo protect the mother from infections.


__X__  The bloods of the mother and the embryo come in close contact without mixing.
_____  The placenta neutralizes toxins like alcohol and drugs before they reach the fetus.
__X__  Oxygen diffuses from the mother to the embryo.
__X__  Carbon dioxide diffuses from the embryo to the mother.
__X__  The placenta provides nourishment and hormones to the embryo.
_____  The antibodies made in the embryo protect the mother from infections.

Biology & Microbiology

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Very large projection on femur _______ .

a. Tubercle b. Epicondyle c. Meatus d. Trochanter e. None of the above

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Which of the following completes its life cycle by infecting a mosquito and a vertebrate?

a. Plasmodium falciparum b. Trypanosoma brucei c. Trypanosoma cruzi d. Plasmopara viticola

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Which of the following elements was NOT

included in the Urey-Miller experiments?

a. oxygen b. methane c. ammonia d. water vapor e. electrical sparks

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Studies have shown that the longer one engages in moderate exercise conditions, 

A. the more fats are used as the prime source of energy. B. the more glycogen is stored in muscle cells. C. the more protein is spared from being used to provide energy. D. All of these answers are true.

Biology & Microbiology