Explain the advantages of using recombinant DNA technology to produce human proteins in transgenic plants, animals, or cultured cells
What will be an ideal response?
Before the development of biotechnology, therapeutic proteins such as insulin, growth hormone, and blood-clotting factors were isolated from many sources, including animals in slaughterhouses, donated human blood, and even human cadavers. In some cases, contamination from these sources exposed people to serious and potentially fatal risks. For example, in the early 1980s, donated blood was not tested for HIV, and as a result, about 60% of all hemophiliacs became infected with HIV from contaminated clotting factor prepared from pooled blood donations. Hemophiliacs who received the serum-concentrated clotting factor also faced a risk of hepatitis infection.
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For a species to be called "invasive," it must _____
I) be introduced to a new area II) spread rapidly in this new area III) eliminate native species A) only I B) only II C) only III D) only II and III E) I, II, and III
Clostridium botulinum cannot produce toxins in improperly preserved foods
Indicate whether the statement is true or false.
Which of the following statements about water is false? a. Hydrogen bonds can form between water and other polar substances
b. The oxygen atom in a water molecule carries a slight negative charge. c. The hydrogen atoms in a water molecule carry a slight negative charge. d. The three-dimensional structure of ice owes its form to hydrogen bonding between water molecules.
Which is a benefit of living in a group? a. Cooperative response to an attack
b. Ability to mount a more formidable defense. c. More eyes to watch for predators. d. All of these choices. e. More individuals who can help counterattack a rival group.