Biology
451. Which of the following organisms have Chitin as a major structural component of their cell wall _______ ?
a. Prokaryotae
b. Protoctista
c. Plantae
d. Fungi
452. All of the following are involved in nitrification except?
a. Nitrobacter
b. Nitrosomonas
c. Rhizobium
d. All of these
453. DNA or RNA of viruses is enclosed in ________ coat?
a. Protein
b. Carbohydrate
c. Lipid
d. DNA
454. In most ecosystems the greatest amount of energy flows through the _______ ?
a. Secondary consumers
b. Herbivores
c. Carnivores
d. Decomposers
455. Which of the following relationship is NOT an example of symbiosis?
a. Rhizobium and leguminous plants
b. Marchantia sporophyte and gametophyte
c. Algae and fungi in a lichen
d. Mycorrhizal fungi and tree roots
456. Other name for Kingdom monera is ________ ?
a. Protoctista
b. Prokaryotae
c. Archaea
d. None of these
457. Animals with greatest number of similarities are grouped together in a/an ________ ?
a. Phylum
b. Family
c. Genus
d. Order
458. Amoeba belongs to which kingdom _______ ?
a. Prokaryotae
b. Plantae
c. Monera
d. Protista
459. Competition between species will be greatest if they attempt to occupy the same ________ ?
a. Ecosystem
b. Community
c. Habitat
d. Niche
460. The one which is present in all aerobic species is ________ ?
a. Cytochrome c
b. Cytochrome a
c. Cytochrome a3
d. Cytochrome b
461. The word virus is derived from Latin word venom meaning ________ ?
a. Sweet Fluid
b. Sore Fluid
c. Poisonous Fluid
d. Salty Fluid
462. The size of smallest virus is ________ ?
a. 10 nm
b. 20 nm
c. 30 nm
d. 40 nm
463. What percentage of light reaching the earth is used in photosynthesis?
a. 25%
b. 10%
c. 5%
d. 1%
464. Viruses are ________ smaller than bacteria?
a. 10 - 100 times
b. 10 - 1000 times
c. 100 - 1000 times
d. 1000 - 10000 times
465. Kangaroo rat most probably would be found in ________ ?
a. Tropical rain forest
b. Tundra
c. Grass land
d. Desert
466. Vaccine was discovered by ________ ?
a. Louis Pasteur
b. Edward Jenner
c. Ivanovski
d. Stanley
467. The name Bacteriophage was coined by ________ ?
a. Charles Chamberland
b. Ivanovski
c. Frederic Twort
d. D Herelle
468. Protein subunits of capsid is called the capsomeres is a characteristic of each virus. Their number in Herpes virus is _______ ?
a. 100
b. 152
c. 162
d. 172
469. Which of the statement about viruses is incorrect _________ ?
a. We can not grow them in laboratories on artificial medias
b. They are obligate intracellular parasite
c. They can synthesize their nucleic acid
d. They are resistant to most of antibiotic treatment
470. A virion is _______ ?
a. Virus
b. Viral protein
c. Viral lysozyme
d. Viral gene
471. For which of the following no preventive vaccine is available?
a. HAV
b. HBV
c. HCV
d. HEV
472. Which one of the following specially result in chronic liver disease leading to hepatic failure:
a. HAV
b. HBV
c. HCV
d. HEV
473. Protein coat the capsid of adenovirus is ________ ?
a. Surrounded by genome
b. Surrounding genome
c. Surrounding the envelop
d. Both B and C
474. Mode of transmission of hepatitis A is ________ ?
a. Serum
b. Faeco-oral
c. Sexual contact
d. All of these
475. Attachment of the bacteriophage with the receptor site on the bacterial cell wall involves _______ ?
a. Strong covalent bond between virion and the receptor site
b. Week chemical union between them
c. Both A and B depending upon the phage
d. None of these
476. Which of the following statement about AIDS is incorrect:
a. is a host specific disease
b. An infected mother cannot pass the virus to her baby
c. Results in enlargement of lymph nodes
d. Can be prevented
477. Bacteriophage that infect E.coli are called _______ ?
a. M type
b. N type
c. T type
d. S type
478. Complex symptoms like severe pneumonia vascular tumor sudden weight loss swollen lymph nodes and immune deficiency are features of:
a. Polio
b. Hepatitis
c. AIDS
d. HIV
479. An isolated virus is not considered living since it _______ ?
a. Separates in to two inner parts
b. Can not metabolize
c. Rapidly looses its Genome chemical inert
d. Is coated with an air tight shield
480. Which of the following is the smallest known virus:
a. Hepatitis virus
b. Retrovirus
c. Polio virus
d. Pox virus
481. The agent of controversial nature causing mad cow infection is _________ ?
a. Bacteria
b. Cowpox Virus
c. Adenovirus
d. Prion
482. Which of the following virus has special affiliations with the tumor production:
a. Hepatitis virus
b. Retrovirus
c. Polio virus
d. Pox virus
483. Which of the following is incorrect for the lysogenic cycle in life cycle of bacteriophage _________ ?
a. Phage when gets incorporated with the bacterial chromosome is called prophage
b. The bacterium continues to live and reproduce normally
c. Lysogenic bacteria may get infected by the related phage
d. The cycle may convert into lytic type resulting from environmental exposure
484. An enzyme which can convert single stranded RNA into double stranded viral DNA is called _________ ?
a. DNAase
b. RNAase
c. DNA polymerase
d. Reverse Transcriptase
485. In lysogenic cycle the process of separation of phage DNA from the hosts chromosome and initiation of lytic cycle is called ________ ?
a. Lysis
b. Lysogeny
c. Induction
d. Adsorption
486. Which of the following disease results in Paralysis due to viral attack on C.N.S:
a. Measles
b. Herpes simplex
c. Hepatitis
d. Polio
487. In life cycle of bacteriophage which step occur after attachment of prophage with the receptor site of the bacterial cell wall ________ ?
a. Absorption
b. Multiplication
c. Lysogeny
d. Penetration
488. Tobacco mosaic virus is ________ ?
a. Spherical
b. Rod Shaped
c. Tadpole like
d. Hexagonal
489. In the Lysogenic cycle the DNA of the bacteriophage _______ ?
a. Joins the bacterial chromosomes
b. Attaches to the inner surface of the host membrane
c. Is immediately degraded when enters the host
d. Goes directly to host ribosomes for translation
490. Which of the following is an RNA virus:
a. Influenza virus
b. Herpes virus
c. HBV
d. Pox virus
491. Temperate phage may exist as ________ ?
a. Prophage
b. Capsid
c. Viron
d. Retrovirus
492. In the lytic cycle of bacteriophage the host DNA is ________ ?
a. Replicated
b. Turn off by the protein coat
c. Digested into its nucleotides
d. Turned on by the removal of the protein coat
493. Pepsinogen is produced from ________ ?
a. Mucous cells
b. Parietal cells
c. Zymogen cells
d. All of these
494. Carbohydrates, fats & proteins are essential for ________ ?
a. Metabolic processes of an organism
b. Providing energy
c. Formation of structures
d. All of these
495. Dipeptides into amino acids are converted through _______ ?
a. Amino peptidase
b. Erypsin
c. Pepsin
d. Trypsin
496. Magnesium is present in which of the following ________ ?
a. Cytochromes
b. ATP
c. Chlorophyll
d. Haemoglobin
497. Deficiency of which of the following causes chlorosis _________ ?
a. Nitrogen
b. Magnesium
c. Iron
d. Both A and B
498. Mastication is carried out by ________ ?
a. Teeth
b. Tongue
c. Smooth muscles
d. All of these
499. Deficiency of K+ causes ________ ?
a. Stunted growth & strong chlorosis
b. No electron transport chains
c. Premature death of leaves
d. Stunted growth of roots
500. Masses of dilated tortuous veins in the anorectal mucosa are known as _______ ?
a. Bulimia
b. Ulcer
c. Adipose tissue
d. Hemorrhoids
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