In which type of gene therapy is the missing gene added to cells which have been removed from a patient and the modified cells then given back to the patient?
A) in vitro
B) in vivo
C) ex vitro
D) ex vivo
D
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Notice that the concentration of CO2 in the atmosphere reaches its highest point at the same time each year. During which time of year does CO2 reach its highest point?
The question is based on Figures 24-8 and 24-9, charts showing the change in atmospheric carbon dioxide measured at the Mauna Loa Observatory in Hawai‘i, from 1958 to April 2016.
What will be an ideal response?
Which of the following statements is untrue?
A. Covalent molecules can have nonbonding electrons. B. Covalent bonds can involve more than one pair of electrons. C. Covalent molecules usually have low melting points. D. Covalent molecules are never crystalline. E. All of the above statements are true.
What is an analemma used for?
a. plotting the movement of Earth around the Sun b. determining the amount of incoming solar radiation c. estimating the circumference of Earth d. showing the declination of the Sun throughout the year e. estimating the curvature of the Earth
What radioactive isotope is generally used to fuel a controlled nuclear chain reaction?
A. uranium 235 B. barium 140 C. cesium 137 D. uranium 95