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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Practice Quizzes

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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: The risk of a mistaken identity using DNA fingerprinting is _____ compared to a risk of error in blood typing of 1 in 1000
	A: 1 in 4000
	B: 1 in 4 million
	C: 1 in 4 billion
	D: 1 in 4 trillion

2: DNA
	A: consists of two polynucleotide strands
	B: is identical to RNA except that RNA consists of a single strand
	C: contains two types of bases: purines and pyrimidines
	D: a and b
	E: a and c

3: A molecule that is not part of a nucleotide is
	A: Phosphate
	B: ribose
	C: nitrogenous base
	D: glucose

4: In DNA, hydrogen bonds are
	A: nonexistent
	B: found between the bases on opposing polynucleotide chains
	C: found between sugars and phosphates
	D: found between the nitrogen bases and sugar molecules

5: The DNA molecule contains
	A: uracil
	B: ribose
	C: equal numbers of cytosine and thymine
	D: contains equal numbers of purines and pyrimidines

6: DNA replication
	A: occurs while the molecule is in the double helix
	B: occurs prior to the S phase of interphase
	C: occurs without the assistance of enzymes
	D: called a semiconservative process because each polynucleotide chain of the DNA molecule serves as a template for production of a new strand

7: Which of the following is a purine base?
	A: Adenine
	B: Guanine
	C: Cytosine
	D: a and b
	E: c and d

8: In the DNA molecule, the complementary base to guanine is
	A: adenine
	B: thymine
	C: cytosine
	D: None of the above

9: Which type of RNA molecule attaches to amino acids and helps insert them in the growing polypeptide chain?
	A: tRNA
	B: mRNA
	C: rRNA
	D: None of the above

10: RNA synthesis
	A: is called translation
	B: is called transcription
	C: occurs during the S phase of interphase
	D: requires an enzyme known as DNA polymerase

11: A sequence of three bases on the mRNA that codes for specific amino acids is called the
	A: initiator codon
	B: anticodon
	C: codon
	D: None of the above

12: The initiator codon is found on
	A: mRNA
	B: DNA
	C: rRNA
	D: tRNA

13: Ribosomes
	A: consist of rRNA
	B: contain the enzyme RNA polymerase
	C: contains two binding sites for tRNA-AAs
	D: bind to amino acids in the cytoplasm and transport them to the mRNA

14: The inducible operon
	A: is part of the mRNA
	B: contains structural genes that produce protein enzymes
	C: are shut off when end products of chemical reactions accumulate inside cells
	D: is switched on by substances called inducers

15: The majority of human genes are believed to be
	A: recessive
	B: dominant
	C: repressible
	D: inducible

16: The reason liver cells are different from muscle cells is
	A: they do not contain the same genetic material
	B: they contain different genes
	C: different genes are active in these cell types
	D: None of the above

17: Somatic mutations
	A: are those that occur in sperm and egg cells
	B: are those that occur in body cells other than germ c
	C: refer to mutations that occur in muscle and bone cells
	D: None of the above

18: Oncogenes are
	A: naturally occurring genes found in body cells
	B: genes carried by viruses that cause viral replication
	C: are genes that control cellular energy production
	D: viral genes that can be inserted into the DNA of body cells stimulating uncontrolled cellular replication

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