Daniel D. Chiras: Human Biology, Fifth Edition: Practice Quizzes

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Title Text: Daniel D. Chiras: Human Biology, Fifth Edition

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Tools For Learning: Practice Quizzes

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.

1: Genetic engineering relies on a group of enzymes used to cut small segments of the DNA molecule: these are known as
	A: introns
	B: restriction endonucleases
	C: DNA polymerase
	D: DNA ligase

2: Plasmids
	A: are strands of DNA taken from viruses
	B: are small cytoplasmic organelles found in eukaryotic cells
	C: are circular strands of DNA that replicate independent of the bacterial DNA
	D: None of the above

3: Which of the following is true?
	A: Reverse transcriptase is an enzyme used to make copies of DNA from tRNA
	B: Geneticists are not yet able to mass produce genes even though they know the sequence of many important human genes
	C: The polymerase chain reaction is used to produce large quantities of RNA
	D: During genetic engineering, foreign genes are often inserted into plasmids which then replicate inside host bacteria, producing multiple copies of the gene

4: DNA ligase
	A: catalyzes the formation of complementary strands of DNA during DNA replication
	B: is used in genetic engineering to remove segments of DNA for spicing
	C: is used to promote RNA synthesis on a DNA template
	D: is used in genetic engineering to splice foreign DNA into plasmids

5: Geneticists produce multiple copies of genes most commonly by
	A: extracting mRNA from cells and making copies of the DNA using the enzyme reverse transcriptase
	B: by inserting genes in plasmids that are inserted into bacteria that replicate in culture dishes
	C: the polymerase chain reaction
	D: None of the above

6: Which of the following substances is produced in mass quantities by genetic engineering?
	A: Human growth hormone
	B: Glucagon
	C: Thyroxin
	D: Estrogen

7: Which of the following is not true?
	A: Producing protein hormones by genetic engineering to treat insufficiencies is faster than extracting the hormones from glands removed from human cadavers
	B: Vaccines cannot be produced by genetic engineering
	C: A transgenic organism is one into which foreign genes have been introduced
	D: The chief advantage of producing protein hormones by genetic engineering for treating insufficiencies is that these hormones are structurally identical to naturally occurring hormones and thus eliminate potentially dangerous immune reactions

8: Which of the following is not true?
	A: It is easier to produce transgenic animals than transgenic plants
	B: Reverse transcriptase helps build a single-stranded DNA molecule from RNA
	C: During gene splicing, DNA ligase is used after restriction endonuclease
	D: Reverse transcriptase occurs naturally in certain viruses

9: Which of the following is correct regarding gene therapy?
	A: The largest obstacle is determining the sequence of bases in human genes
	B: Inserting genes into body cells to replace defective genes is a well established technique
	C: Liposomes, tiny lipid spheres, could be used to insert genes in specific target cells
	D: Gene therapy, while important, can only treat diseases not cure them

10: Which of the following is true?
	A: DNA fingerprinting relies on DNA probes, small fragments of DNA that bind to samples of DNA taken from crime scenes
	B: DNA fingerprinting is an unreliable technique with a high error rate
	C: The release of genetically altered bacteria and viruses created by genetic engineering is of little concern to opponents of this technique
	D: None of the above

Optional: Enter your name and your instructor's E-mail address to have your results E-mailed to him or her.
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