Inhaled air has a higher partial pressure of oxygen than blood in pulmonary capillaries. Therefore, oxygen ____
a. dissociates from hemoglobin
b. diffuses out of the blood, into the air
c. diffuses into the blood from the air
d. moves out of the lungs during exhalation
e. does not cross the respiratory membrane
c
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Plasmid vectors often contain ________ genes that can be used to screen for recombinants.
A. antibiotic resistance B. insertion sequence C. metabolic activation D. promoter/operator
You are wanting to modify plant cells. With the procedure you are using, the plant cells must be in a plasmolyzed state. This means that the plant cells must be placed in a(n)
A) acid solution. B) hypotonic solution. C) isotonic solution. D) basic solution. E) hypertonic solution.
All of the following animals have placentas EXCEPT
a. kangaroos. b. opposums. c. echidnas. d. koalas. e. wombats.
Which of the following structures allows a bacterium to propel itself through its environment?
a. microfilaments b. intermediate filaments c. microvillus d. flagellum e. microtubule