A friend asks you a question after your biology class. "What's genetic engineering?" What is your answer?
A. "Genetic engineering is moving genes from one organism to another."
B. "Genetic engineering is removing structural components, for example a lysosome, from one part of a cell and placing those structures elsewhere in that cell."
C. "Genetic engineering is the ability of scientists to remove a nucleus from a cell and place it into another cell."
D. "Genetic engineering is taking proteins from one organism and placing them into another organism of a different species."
Answer: A
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Why doesn't a flatworm have a circulatory system?
a. The animal is flat enough to permit effective gas exchange by diffusion. b. There is not enough room for a circulatory system. c. The animal lacks muscles, so it could not have a heart to pump blood. d. Only bilaterally symmetrical animals need a circulatory system. e. Only vertebrates have circulatory systems.
In muscular dystrophy, muscle cells lack a protein called dystrophin, which leads to weakening of the muscles. As a biomedical researcher, your goal is to create a gene therapy approach to treating muscular dystrophy. You have a sequence of DNA that
contains the dystrophin gene and a virus that infects human cells. You want to combine the dystrophin gene with the viral DNA so that the virus can infect and insert the gene into the muscle cells as a way to treat the disease. Explain how you would get the dystrophin gene into the viral DNA. What will be an ideal response?
Oxidation and reduction states are relatively easy to determine for metal ions, because there is a measurable net charge. In the case of carbon compounds, oxidation and reduction depend on the nature of polar covalent bonds
Which of the following is the best way to describe these types of bond? (a) hydrogen bonds in a nonpolar solution (b) covalent bonds in an aqueous solution (c) unequal sharing of electrons across a covalent bond (d) equal sharing of electrons across a covalent bond
We can learn about the climate of different periods throughout history by studying what aspect of the bubbles trapped in ice core samples?
A) The temperature of the air inside the bubbles B) The average volume of the bubbles C) The levels of different gases in the bubbles D) The average pressure of the air inside the bubbles