Q & A - Science

Q & A

• Which of the following is false regarding how a differentiation strategy can help a firm Which of the following is false regarding how a differentiation strategy can help a firm to improve its competitive position vis à vis Porter's five forces? (A) By incr...
• Primary value chain activities that involve the effective layout of receiving dock operati Primary value chain activities that involve the effective layout of receiving dock operations (inbound logistics) and support value chain activities that include expertis...
• Viruses and bacteria are the only infectious agents found in plants and animals Viruses and bacteria are the only infectious agents found in plants and animals. (A) True (B) False
• HIV binds to the human white blood cell receptor protein CD4 HIV binds to the human white blood cell receptor protein CD4. (A) True (B) False
• Some viruses enter the cell through endocytosis Some viruses enter the cell through endocytosis. (A) True (B) False
• The HIV virus uses the host cell's reverse transcriptase to manufacture DNA The HIV virus uses the host cell's reverse transcriptase to manufacture DNA. (A) True (B) False
• New strains of influenza continually arise because the virus mutates and recombines the 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
• Viruses are more closely related to chemical matter than to a living organism Viruses are more closely related to chemical matter than to a living organism. (A) True (B) False
• Of the viruses listed below, the most lethal is Of the viruses listed below, the most lethal is (A) Influenza (B) Ebola (C) Measles (D) Herpes simplex (E) Epstein-Barr
• When a virus kills the infected host cell in which it is replicating, the reproductive 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...
• causes the host cell to synthesize a double strand of DNA complementary to the viral RNA 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)...
• In AIDS patients, the virus homes in on the In AIDS patients, the virus homes in on the _______________ T cells. (A) CD1+ (B) CD2+ (C) CD3+ (D) CD4+ (E) CD5+
• Typically, viruses form Typically, viruses form _______________ around their nucleic acid. (A) An envelope (B) A cell wall (C) A capsid (D) A cell membrane (E) A capsule
• Persons infected with HIV may not develop AIDS because the virus has the Persons infected with HIV may not develop AIDS because the virus has the ________ gene. (A) CAF (B) gag (C) pol (D) nef (E) env
• Which of the following is not a viral disease Which of the following is not a viral disease? (A) Mumps (B) Measles (C) Chicken pox (D) Rubella (E) Diphtheria
• Viruses that cause lysis in host cells are called Viruses that cause lysis in host cells are called (A) Temperate viruses (B) Phagocytic viruses (C) Prions (D) Virulent viruses (E) Infectious viruses
• are small naked fragments of RNA that infect plant cells __________ are small naked fragments of RNA that infect plant cells. (A) Prions (B) Nucleons (C) Prophages (D) Macrophages (E) Viroids
• The only structural pattern that has been found among isometric viruses is The only structural pattern that has been found among isometric viruses is (A) Icosahedral (B) Spherical (C) Helical (D) Tetrahedral (E) Capsular
• Each HIV particle possesses a glycoprotein called Each HIV particle possesses a glycoprotein called __________ on its surface (A) CD4 (B) gp120 (C) CXCR4 (D) gp8 (E) nef
• When a bacteriophage is integrated into a cellular genome it is called a 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
• The CD8+ cell antiviral factor (CAF) is used to 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 C...
• The genetic alteration of a cell's genome is called The genetic alteration of a cell's genome is called (A) Transformation (B) Reverse transcription (C) Genome conversion (D) Invasion
• The separation of the Archaebacteria into a separate domain indicates The separation of the Archaebacteria into a separate domain indicates (A) That these organisms are very different from eubacteria and from eukaryotes (B) That organis...
• A cladogram conveys information about ancestors and descendants of an organism A cladogram conveys information about ancestors and descendants of an organism. (A) True (B) False
• Biologists currently recognize three kingdoms: Plants, Animals, and Protists Biologists currently recognize three kingdoms: Plants, Animals, and Protists. (A) True (B) False
• The scientific name is derived from the genus and species to which an organism belongs The scientific name is derived from the genus and species to which an organism belongs. (A) True (B) False
• Polynomial classification has recently begun to replace the binomial system Polynomial classification has recently begun to replace the binomial system. (A) True (B) False
• Cladistic taxonomy places the birds as Archosaurs, along with the Cladistic taxonomy places the birds as Archosaurs, along with the: (A) Mammals (B) Crocodilians (C) Turtles (D) Snakes (E) None of the above
• At the present time, scientists have named approximately At the present time, scientists have named approximately ____ species. (A) 100,000 (B) 500,000 (C) 1,000,000 (D) 1,500,000 (E) 10,000,000
• Which one of the following sequences shows the correct hierarchy of classification Which one of the following sequences shows the correct hierarchy of classification, going from the most inclusive to the least inclusive? (A) Kingdom, Domain, Phylum, O...
• The binomial system of classification was developed by The binomial system of classification was developed by: (A) Darwin (B) Wallace (C) Linnaeus (D) Malthus (E) none of the above
• Modern biologists prefer to perceive the phylogenetic tree of organisms as multibranched Modern biologists prefer to perceive the phylogenetic tree of organisms as multibranched, rather than linear, with no particular species being "higher", or superior, to a...
• A taxon consisting of the most closely related species is called A taxon consisting of the most closely related species is called a(n) ________________. (A) Family (B) Order (C) Genus (D) Phylum
• Throughout the world, official species names are in Throughout the world, official species names are in (A) Latin (B) Greek (C) English (D) French (E) The native language
• Multicellular organisms and unicellular yeasts are contained in Multicellular organisms and unicellular yeasts are contained in (A) Animalia (B) Plantae (C) Protista (D) Fungi (E) Eubacteria
• The oldest level of taxonomic classification is The oldest level of taxonomic classification is (A) Class (B) Family (C) Genus (D) Phylum (E) Species
• Characteristics that have arisen as a result of common evolutionary descent are said to be Characteristics that have arisen as a result of common evolutionary descent are said to be (A) Analogous (B) Homogenous (C) Heterogamous (D) Homologous (E) Contiguous
• In printing scientific names, it is conventional for only the In printing scientific names, it is conventional for only the _______________ to be underlined or italicized. (A) Binomial (B) Genus (C) Species (D) Division (E) Kingdom
• In the early 1700's, the classification system used was In the early 1700's, the classification system used was (A) Polynomial (B) Pentanomial (C) Binomial (D) Tetranomial (E) Trinomial
• In printed scientific names, only the In printed scientific names, only the _______________ is capitalized. (A) Family (B) Class (C) Species (D) Kingdom (E) Genus
• In plant taxonomy, a division is the equivalent to In plant taxonomy, a division is the equivalent to _______________ . (A) Family (B) Order (C) Class (D) Phylum (E) Kingdom
• In the current taxonomic system, families are grouped into In the current taxonomic system, families are grouped into (A) Vlasses (B) Phyla (C) Orders (D) Divisions (E) Kingdoms
• When writing species epithets, it is sometimes permissible to abbreviate the When writing species epithets, it is sometimes permissible to abbreviate the _______________ name. (A) Species (B) Phylum (C) Order (D) Family (E) Genus
• The plant alternation of generations is characterized by The plant alternation of generations is characterized by _______________ meiosis. (A) Zygotic (B) Somatic (C) Sporic (D) Generic (E) Gametic
• A major problem with polynomial names was that they were A major problem with polynomial names was that they were (A) Inaccurate (B) Cumbersome (C) Not descriptive (D) In Latin (E) In Greek
• Viruses are denied a kingdom of their own because Viruses are denied a kingdom of their own because (A) They are too poorly understood (B) They are too small (C) Their genetics cannot be determined (D) They are n...
• The institution of the classification level of domain was prompted by The institution of the classification level of domain was prompted by (A) The overabundance of kingdoms (B) Cladistics (C) Great differences among bacteria (D) Th...
• As a practical definition of species, one can say that they are a group of organisms As a practical definition of species, one can say that they are a group of organisms characterized by all of the following except they (A) Do not normally interbreed wi...
• A group of organisms at any particular level in a classification system is called a A group of organisms at any particular level in a classification system is called a (A) Species (B) Genus (C) Taxon (D) Phylum
• Of the various factors responsible for extinction in the Americas, the greatest is Of the various factors responsible for extinction in the Americas, the greatest is (A) Predation (B) Introduced species (C) Overexploitation (D) Habitat loss