Exam 2 Key - MyDNA BIOCHM100 Fall 2008 M Fitzgerald-Hayes...

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1 MyDNA BIOCHM100 Fall 2008 M. Fitzgerald-Hayes Practice Exam #2 KEY 1. During growth and development, eucaryotic cells respond to a variety of signals from: a) the outside environment b) inside the cell c) other tissues in the body d) all of the above e) none of the above 2. After a human embryo reaches the blastocyst stage, the next important event that must occur in order for the embryo to continue to develop into a successful pregnancy is: a) fertilization by sperm b) development of the umbilical cord c) implantation of the blastocyst embryo into the uterus d) cell migration to make the disc and the neural tube 3. Which of these cell types generate the embryonic stem cells in the developing embryo? a) the pancreatic cells that produce insulin b) inner cell mass cells formed in animal embryos c) adult cells in the human body d) nerve cells in the spinal cord 4. The term “nuclear-reprogramming” refers to which process? a) After the nucleus divides to make two cells in cell division, the nucleus must be reprogrammed. b) This happens when the nucleus needs to express certain gene products during illness or stress c) After fertilization the zygote nucleus contains a new genome; changes in the nucleus dictate gene expression during embryo development d) Changes in the genome in a nucleus where entire regions of DNA (and genes) are removed from the chromosomes 5. If a patient were to receive transplanted tissues that were derived from the patient’s own embryonic stem cells, how would the patient’s body react to these transplanted tissues? a) The transplanted tissues derived from the embryonic stem cells are foreign to the patient and therefore rejected by the patient’s body. b) The transplanted tissues are accepted by the patient’s body as “self” and are not rejected as “foreign”.
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2 c) The transplanted tissues are accepted as long as they come from a biologically unrelated donor. d) The transplanted tissues are altered inside the patient’s body so that they are rejected by the recipient. 6. The process of “reading” an mRNA molecule to make a specific protein product takes place: a) inside the nucleus of the cell b) outside of the cell in special cases c) only after cell differentiation takes place d) on a ribosome (molecular machine) 7. A bone marrow transplant can be used to treat some types of cancer because bone marrow: a) contains blood stem cells that can differentiate into several different cell types found in human blood b) is the only place in the adult body where embryonic stem cells are produced c) can be transplanted into any recipient patient and not be rejected by the recipient. d) contains stem cells that can develop into any type of adult cell in the body 8. President Bush decided to ban the use of federal funds to support research on embryonic stem cell research in the United States. As a result: a) all embryonic stem cell research is illegal in the U.S., no matter who supplies the money b) embryonic stem cell research paid for by the federal government
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Exam 2 Key - MyDNA BIOCHM100 Fall 2008 M Fitzgerald-Hayes...

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