Student Center | Instructor Center | Information Center | Home

	Enhancement Chapters
	Virtual Classroom
	Biology 6/e Web Links
	Interactive Maps
	Virtual Labs
	Journal Web Links
	Author's Bookshelf


	eLearning Sessions
	Multiple Choice
	Answers to Review Questions

	Feedback Help Center

Biology, 6/e

Author Dr. George B. Johnson, Washington University
Author Dr. Peter H. Raven, Missouri Botanical Gardens & Washington University
Contributor Dr. Susan Singer, Carleton College
Contributor Dr. Jonathan Losos, Washington University

Viruses

Multiple Choice Quiz

Please answer all questions


1	A lysogenic cycle involves
		A)	early lysis of the host cell
		B)	the ultimate formation of a prophage
		C)	lysis by the lambda lytic protein
		D)	a period of genome integration


2	The genetic alteration of a cell's genome is called
		A)	transformation
		B)	reverse transcription
		C)	genome conversion
		D)	invasion


3	The CD8+ cell antiviral factor (CAF) is used to
		A)	block the CCR5 receptor
		B)	disable the CXCR4 receptor
		C)	block replication of the HIV virus
		D)	mutate the CCR5 and CXCR4 receptors


4	The function of the drug AZT is to
		A)	disable reverse transcription
		B)	block production of envelope protein
		C)	block HIV replication
		D)	block capsid protein formation


5	Influenza subtypes differ in their
		A)	protein spikes
		B)	capsid composition
		C)	capsule composition
		D)	kinds of nucleic acids


6	When a bacteriophage is integrated into a cellular genome it is called a
		A)	virulent virus
		B)	lytic virus
		C)	prophage
		D)	transducing virus
		E)	microphage


7	The infectious substance of prions is
		A)	protein
		B)	glycophosphate
		C)	RNA
		D)	DNA
		E)	glycoprotein


8	Viruses are considered to be
		A)	non-living
		B)	primitive precursors of bacteria
		C)	a link between life and non-life
		D)	primitive organisms
		E)	very small bacteria


9	Each HIV particle possesses a glycoprotein called __________ on its surface
		A)	CD4
		B)	gp120
		C)	CXCR4
		D)	gp8
		E)	nef


10	The only structural pattern that has been found among isometric viruses is
		A)	icosahedral
		B)	spherical
		C)	helical
		D)	tetrahedral
		E)	capsular


11	__________ are small naked fragments of RNA that infect plant cells.
		A)	Prions
		B)	Nucleons
		C)	Prophages
		D)	Macrophages
		E)	Viroids


12	Viruses that cause lysis in host cells are called
		A)	temperate viruses
		B)	phagocytic viruses
		C)	prions
		D)	virulent viruses
		E)	infectious viruses


13	_________ is the virus causing fever blisters
		A)	Herpes simplex
		B)	Chlamydia
		C)	Epstein-Barr virus
		D)	Human papillomavirus
		E)	Lyme disease


14	Which of the following is not a viral disease?
		A)	mumps
		B)	measles
		C)	chicken pox
		D)	rubella
		E)	diphtheria


15	An example of an emerging virus is
		A)	Herpes
		B)	polio
		C)	rubella
		D)	CJD
		E)	Ebola


16	Copying the HIV virus' nucleic acid depends on
		A)	replicase
		B)	reverse transcriptase
		C)	transcriptase
		D)	reverse replicase
		E)	nucleases


17	Persons infected with HIV may not develop AIDS because the virus has the ________ gene.
		A)	CAF
		B)	gag
		C)	pol
		D)	nef
		E)	env


18	________ may prevent HIV replication by binding with the CD4 receptor.
		A)	gp120
		B)	CXCR4
		C)	Reverse transcriptase
		D)	CCR5
		E)	Chemokines


19	Typically, viruses form _______________ around their nucleic acid.
		A)	an envelope
		B)	a cell wall
		C)	a capsid
		D)	a cell membrane
		E)	a capsule


20	Viruses are most conveniently thought of as
		A)	lost chromosomes
		B)	the most primitive bacteria
		C)	particles of genomes
		D)	prions
		E)	escaped genomes


21	In AIDS patients, the virus homes in on the _______________ T cells.
		A)	CD1+
		B)	CD2+
		C)	CD3+
		D)	CD4+
		E)	CD5+


22	The viral enzyme, _________, causes the host cell to synthesize a double strand of DNA complementary to the viral RNA.
		A)	reverse transcriptase
		B)	chemokinase
		C)	virase
		D)	replicase
		E)	antiscriptase


23	The first virus to be purified was the
		A)	flu virus
		B)	tobacco mosaic virus
		C)	smallpox virus
		D)	polio virus
		E)	plague virus


24	When a virus kills the infected host cell in which it is replicating, the reproductive cycle is called a ________ cycle.
		A)	lysogenic
		B)	phagocytic
		C)	lytic
		D)	viroidal
		E)	endocytic


25	Of the viruses listed below, the most lethal is
		A)	influenza
		B)	Ebola
		C)	measles
		D)	herpes simplex
		E)	Epstein-Barr


26	Viruses have an overall structure that is
		A)	spherical
		B)	isometric
		C)	icosahedron
		D)	helical
		E)	all of the above


27	The basic structure of a virus contains:
		A)	a nucleic acid
		B)	a cell wall
		C)	a protein coat
		D)	both a and b
		E)	both a and c


28	Which of the following are not matched correctly:
		A)	virulent virus-lytic cycle
		B)	temperate virus-non-infecting virus
		C)	lysogenic virus-genome becomes part of host genome
		D)	lytic cycle-kills host cell
		E)	none of the above


29	Viruses are more closely related to chemical matter than to a living organism.
		A)	True
		B)	False


30	New strains of influenza continually arise because the virus mutates and recombines the gene encoding the protein that makes it resistant to antibodies.
		A)	True
		B)	False


31	The HIV virus uses the host cell's reverse transcriptase to manufacture DNA.
		A)	True
		B)	False


32	Some viruses enter the cell through endocytosis.
		A)	True
		B)	False


33	HIV binds to the human white blood cell receptor protein CD4.
		A)	True
		B)	False


34	HIV is a DNA virus.
		A)	True
		B)	False


35	Viruses and bacteria are the only infectious agents found in plants and animals.
		A)	True
		B)	False

2002 McGraw-Hill Higher Education
Any use is subject to the Terms of Use and Privacy Notice.
McGraw-Hill Higher Education is one of the many fine businesses of The McGraw-Hill Companies.