Which of the following is NOT an indirect value of biodiversity in an ecosystem?
A. water purification
B. waste recycling
C. biogeochemical cycling
D. prevention of soil erosion
E. All of the choices are roles played by biodiversity.
Answer: E
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Describe how the amphipathic nature of phospholipids leads to the formation of the phospholipid bilayer organization observed in membrane structure. Based upon this information, how would you design a drug delivery system to cross the cell membrane?
What will be an ideal response?
XYY males tend to
a. have reproductive problems. b. be slightly retarded. c. have learning disabilities. d. be sterile. e. develop normally.
Which of the following statements regarding infertility and fertilization procedures is true?
A) Embryos fertilized through assisted reproductive technologies cannot be frozen for later use, as they degrade rapidly. B) In GIFT, sperm are injected into an embryo in vitro, and the embryo is placed into the oviducts. C) In IVF, fertilization occurs in a dish. The embryo is allowed to develop for several days, and then the embryo is placed into the uterus. D) Cells cannot be removed from the blastocyst without harm to the embryo.
The enzyme that can proofreads replicating DNA, detects incorrect bases, excises them, and correctly replaces them is
A. DNA ligase. B. DNA helicase. C. DNA polymerase. D. DNA gyrase. E. primase.