Zacchias has been in a horrible fire, and 50% of the total surface of his skin has been destroyed. Given the information in this chapter, why is it so important to replace the burned skin, and what is his best specific option for replacement?
What will be an ideal response?
Unbroken skin is a very important physical barrier of the first line of defense against pathogens. Skin is acidic and provided with oils and other chemicals that discourage bacteria. In addition, the outer skin cells are tough and constantly flake off, making it difficult for bacteria to penetrate more deeply into the body. Since Zacchias has many areas of his skin that are still healthy, the most sensible solution is for his physicians to remove skin from one part of his body and transplant it to the burned areas.
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What is the purpose of DNA ligase in a cloning experiment?
A. The purpose is to proofread the vector for mistakes. B. The purpose is to reestablish the stable sugar-phosphate backbone of the DNA molecule C. The purpose is to allow the vector to enter into the cell. D. The purpose is to function as a selectable marker.
Almost all cacti are native to the Americas, but there is a small, relatively uncommon group of plants closely related to cacti native to tropical western Africa. How can we explain this given the information in this chapter?
A) The plants might have floated across the Atlantic. B) This might have been caused by divergent evolution. C) The continents were once connected. D) All of the above are true.
Physical methods of microbial control include heat, cold, radiation, drying, and filtration.
a. true b. false
Which of the following statements characterize heterospory?
A. It involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. B. It increases the chance of cross-fertilization. C. It increases the potential for genetic variation and aids evolutionary flexibility. D. It involves production of two different types of spores from a single sporangium. E. It occurs in seed plants and seedless vascular plants.