biology Mcqs
451. In human female, fertilization commonly occurs at______________?
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A. Distal part of oviduct

B. Proximal part of oviduct

C. Uterus

D. Cervix

452. Proteins are polymers of___________?
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A. Fatty acids

B. Amino acids

C. Isoprenoid units

D. Nucleotides

453. Glycolipids and glycoproteins have structural role in the ______________ matrix of animal and bacterial cell?
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A. Extracellular

B. Intracellular

C. Both of these

D. Glucose

454. The covalent bond between two monosaccharide subunits is called________________?
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A. Phosphodiester bond

B. Peptide bond

C. Ionic bond

D. Glycosidic Bond
455. Who first observed and thus hypothesized that new cells are formed from previously existing living cell?
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A. Theodor Schwann and Schleiden

B. Rudolph Virchows

C. Louis Pasteur

D. Both b and c

456. How many moles of carbon dioxide are produced by complete oxidation of one mole of puruvic acid?
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A. 2

B. 1

C. 6

D. 3
457. Shell of egg is leathery in appearance in___________?
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A. Prototherians

B. Birds

C. Reptiles

D. Amphibians

458. An enzyme which can convert single stranded RNA into double stranded viral DNA is called____________?
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A. DNA polymerase

B. DNAase

C. RNAase

D. Reverse Transcriptase
459. Protein subunits of capsid is called the capsomeres is a characteristic of each virus. Their number in Herpes virus is__________?
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A. 152

B. 162

C. 172

D. 100

460. in which cell ribosome are of large size and present either on endoplasmic reticulum or free in cytoplasm?
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A. both

B. all the above

C. eukaryotic

D. prokaryotic

461. Which of following system is segmentally arranged in annelids?
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A. Criculatory system

B. Digestive system

C. Nervous system

D. Excretory system

462. Which of the following statement is incorrect about algae______________?
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A. Their zygote unlike plants is protected by parental tissue

B. Most of them have different morphological forms in-different stages of their life cycle

C. Their classification is based on pigment composition

D. Almost all of them are aquatic

463. All of the following coelenterates show alternation of generation except:
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A. Obelia

B. Hydra

C. None of these

D. Aurelia

464. Of the following, which one is missing in herbivores_______________?
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A. Premolars

B. Incisors

C. Molars.

D. Canines
465. Cyanobacteria have ________ cell wall?
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A. Gram ve.

B. Gram +ve.

C. Acid fast

D. Cellulose rich

466. Free living example of Platyhelminthes is____________?
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A. Dugesia

B. Fasciola

C. None of these

D. Taenia

467. The only group of algae having no flagellated motile cells at any stage is___________?
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A. Rhodophyta

B. Phaeophyta

C. Pyrrophyta

D. Chrysophyta

468. Midgut in cockroach is a short narrow tube called____________?
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A. Hepatic caeca

B. Stomach

C. Rectum

D. Gizzard

469. cells are of__________types?
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A. 2

B. 1

C. 3

D. 4

470. E. coli and example of entrobacteriace is important for causing diarrheal diseases its size is____________?
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A. 0.75-1.25 um

B. 1.1-1.5 um (width) 2.0-6.0 um (length)

C. 100-200 nm

D. 0.1-600 um

471. Antheridia and archegonia are born on ______________ in bryophytes.
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A. Sporophyte

B. Gametophyte

C. Both of these

D. None of these

472. Which of the following is incorrect for the lysogenic cycle in life cycle of bacteriophage_____________?
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A. The cycle may convert into lytic type resulting from environmental exposure

B. Phage when gets incorporated with the bacterial chromosome is called prophage

C. The bacterium continues to live and reproduce normally

D. Lysogenic bacteria may get infected by the related phage
473. Gram positive bacteria appear_______________?
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A. Purple

B. Pink

C. Red

D. Blue

474. Based on molecular data euglenoids are thought to be closely related to___________?
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A. Zooflagellates

B. Algae

C. Protozoans

D. Dinoflagellates

475. An isolated virus is not considered living since it________________?
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A. Is coated with an air tight shield

B. Can not metabolize

C. Separates in to two inner parts

D. Rapidly looses its Genome chemical inert

476. Chemical substances used on living tissues that inhibit the growth of micro organism are called___________?
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A. Disinfectants

B. Vaccines

C. Antiseptics

D. Antibiotics

477. Nervous system of nematods consists of?
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A. All of these

B. Lateral nerve cord

C. Dorsal nerve cord

D. Ventral nerve cord

478. Which of the following statement about plants is incorrect?
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A. They are multicellular.

B. They Are heterotrophes

C. All are eukaryotes

D. Non-motile organisms

479. Nodules on roots of leguminous plants have __________ bacteria?
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A. Anaerobic

B. Ammonifying

C. Nitrogen fixing

D. Nitrifying

480. in animals meiosis produces____________?
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A. spores

B. gametes

C. both a & b

D. all the above

481. Autotrophic organisms can exist in an exclusively ________________ environment?
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A. Organic

B. Inorganic

C. Terrestrial

D. Wet

482. Deficiency of K+ causes_____________?
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A. Premature death of leaves

B. Stunted growth of roots

C. Stunted growth & strong chlorosis

D. No electron transport chains

483. The resolving power of electric microscope is____________?
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A. 0.2 nm

B. 0.2 mm

C. 0.2 m

D. none of these

484. Bacteriopahage that infect E. coli are called_____________?
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A. S type

B. N type

C. T type

D. M type

485. Attachment of the bacteriophage with the receptor site on the bacterial cell wall involves_______________?
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A. Strong covalent bond between virion and the receptor site.

B. Week chemical unior between them

C. Both A and B depending upon the phage

D. None of these

486. In chlorophytes the main energy stores are__________?
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A. Starch

B. Cellulose

C. Glycogen

D. All of these

487. Which of the following bacteria are thick rigid and spiral______________?
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A. Vibrio

B. Spirochete

C. Spirillum

D. Coccus

488. Which of the following is called black bread mold?
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A. Pilobolus

B. Neurospora

C. Rhizopus

D. Penicillium

489. Which one of the following is different from all the rest regarding the number of cells inits body_______________?
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A. Rusts

B. Molds

C. Yeasts

D. Mushrooms

490. Which of the following statement about eiliates in incorrect_____________?
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A. Contain mainly unicellular organisms.

B. They are even capable of sexual reproduction.

C. Their contractile vacoule is respobsible for water regulation.

D. Diploid nucleus being smaller is responsible for cells metabolism and growth whilepolyploidy nucleus functions in sexual process.
491. Of the following which one is not the characteristic of triploblasts?
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A. All of them have digestive system

B. They may be coelomate pseudocoelomate or acoelomate

C. They are included in grade bilaterian

D. All of them have blood vascular system
492. Hepatic and Pancreatic secretions are also stimulated by a hormone produced by the intestinal mucosa. The hormone is___________?
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A. Secretin

B. Gastrin

C. Creatin

D. Pepsin

493. Oyster mushroom is an example of predator fungi which attack on______________?
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A. Tape worms

B. Pin warms

C. Platehelminthes

D. Round worms
494. Enteron in coelenterates acts as___________?
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A. Transporting cavity

B. Body cavity

C. all of these

D. Digestive cavity

495. Which of the following is responsible for Irish potato famine?
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A. Dinoflagellates

B. Physarum polycephalum

C. Kleps

D. Phytophthora infestans
496. Puccinia commonly destroys______________?
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A. Tomato

B. Wheat

C. Dodder

D. Corn

497. In the Lysogenic cycle the DNA of the bacteriophage__________________?
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A. Goes directly to host ribosomes for translation

B. Attaches to the inner surface of the host membrane

C. Is immediately degraded when enters the host

D. Joins the bacterial chromosomes
498. The Kingdom of recyclers is known as kingdom_____________?
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A. Algae

B. Bacteria

C. Fungi

D. Embryophata

499. Viruses are __________ smaller than bacteria?
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A. 100 1000 times

B. 10 100 times

C. 10 1000 times

D. 1000 10000 times

500. Body is eel like in___________?
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A. Cyclostomata

B. None of these

C. Osteichthyes

D. Chondrichthyes