Biology Mcqs Test Preparation for ECAT & MCAT - Set 25

1)   Methionine is specified by

a. Stop codon
b. AUG
c. Start codon
d. Both b and c
Answer  Explanation 

ANSWER: Both b and c

Explanation:
No explanation is available for this question!


2)   In mitochondria UGA is/specifies as

a. Stop codon
b. Tryptophan
c. Initiation codon
d. Methionine
Answer  Explanation 

ANSWER: Tryptophan

Explanation:
No explanation is available for this question!


3)   Three nucleotide sequence on tRNA that specifies an amino acis is

a. Codon
b. Anticodon
c. Nonsense codon
d. Genetic code
Answer  Explanation 

ANSWER: Anticodon

Explanation:
No explanation is available for this question!


4)   Initiation complex in translation is composed of

a. Ribosome and aminoacyl-tRNA
b. Ribosome and tRNA
c. tRNA and aminoacyl-tRNA
d. None of these
Answer  Explanation 

ANSWER: Ribosome and aminoacyl-tRNA

Explanation:
No explanation is available for this question!


5)   Examples of chromosomal aberrations are

a. Sickle cell anemia
b. Phenylketonuria
c. Down's syndrome
d. Both a and b
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


6)   Point mutations are represented as

a. Presence of an extra chromosome
b. Loss of chromosome
c. Alteration in sequence of DNA nucleotide
d. Insertions and inversion of genes
Answer  Explanation 

ANSWER: Alteration in sequence of DNA nucleotide

Explanation:
No explanation is available for this question!


7)   Strand of DNA which is not transcribed is called

a. Antisense
b. Template
c. Coding
d. None of these
Answer  Explanation 

ANSWER: Coding

Explanation:
No explanation is available for this question!


8)   Phenylketonuria is due to deficiency of

a. Phenylalnine
b. Phenylalanine hydroxylase
c. Phenylene
d. All of these
Answer  Explanation 

ANSWER: Phenylalanine hydroxylase

Explanation:
No explanation is available for this question!


9)   Molecular basis of sickle cell anaemia was found by

a. F. Sanger
b. Beadle and Tatum
c. Vernone Ingram
d. Mendal
Answer  Explanation 

ANSWER: Vernone Ingram

Explanation:
No explanation is available for this question!


10)   Which is incorrect about nucleosome

a. 2 turns of DNA coiled round histones
b. 8 histones as acidic proteins
c. 200 nucleotides in one nucleosome
d. None of these
Answer  Explanation 

ANSWER: 8 histones as acidic proteins

Explanation:
No explanation is available for this question!


11)   Sex chromosomes were 1' discovered in

a. Man
b. Pea plant
c. Fruitfly
d. None of these
Answer  Explanation 

ANSWER: Fruitfly

Explanation:
No explanation is available for this question!


12)   A sugarcane cell has _________ chromosomes.

a. 20
b. 32
c. 40
d. 80
Answer  Explanation 

ANSWER: 80

Explanation:
No explanation is available for this question!


13)   Centromere represents

a. Primary constriction
b. Secondary constriction
c. Tertiary constriction
d. Quaternary constriction
Answer  Explanation 

ANSWER: Primary constriction

Explanation:
No explanation is available for this question!


14)   Wich of the following cal kill mice if injected separately?

a. Live R type pneumococcus
b. Heat killed R type pneumococcus
c. Live S type pneumococcus
d. Heat killed S type pneumococcus
Answer  Explanation 

ANSWER: Live S type pneumococcus

Explanation:
No explanation is available for this question!


15)   X-Ray diffraction pattern of DNA was prepared by

a. Rosalind Franklin
b. Maurice Wilkins
c. Watson
d. Crick
Answer  Explanation 

ANSWER: Rosalind Franklin

Explanation:
No explanation is available for this question!


16)   In sickle cell Hb, which chain is affected?

a. Alpha chain
b. Beta Chain
c. Both of these
d. None of these
Answer  Explanation 

ANSWER: Beta Chain

Explanation:
No explanation is available for this question!


17)   Recombinant DNA contains DNA from

a. 2 different sources
b. 3 different sources
c. 2 same sources
d. 3 same sources
Answer  Explanation 

ANSWER: 2 different sources

Explanation:
No explanation is available for this question!


18)   First restriction enzyme was isolated by

a. Kary Mullis
b. Hamilton O. Smith
c. Maxam Gilbert
d. Hamilton John
Answer  Explanation 

ANSWER: Hamilton O. Smith

Explanation:
No explanation is available for this question!


19)   Commonly used restriction enzyme is

a. pSC 101
b. pBR 322
c. EcoRI
d. All of these
Answer  Explanation 

ANSWER: EcoRI

Explanation:
No explanation is available for this question!


20)   Natural extrachromosomal circular DNA molecules earrying genes for antibiotic resistance and fertility

a. Recombinant DNA
b. Chimaeric DNA
c. Lambda phage
d. Plasmids
Answer  Explanation 

ANSWER: Plasmids

Explanation:
No explanation is available for this question!


21)   Which one has antibiotic resistance gene for tetracycline and ampicillin?

a. pSC 101
b. pBR 322
c. pCR 322
d. None of these
Answer  Explanation 

ANSWER: pBR 322

Explanation:
No explanation is available for this question!


22)   The enzyme which seals the foreign DNA into the vector is

a. Restriction endonuclease
b. DNA polymerase
c. DNA ligase
d. DNA mutase
Answer  Explanation 

ANSWER: DNA ligase

Explanation:
No explanation is available for this question!


23)   Chimaeric DNA is also known as

a. Recombinant DNA
b. Complementary DNA
c. Vector
d. Plasmid
Answer  Explanation 

ANSWER: Recombinant DNA

Explanation:
No explanation is available for this question!


24)   Lambda phage is

a. Virus
b. Bacterium
c. Plasmid
d. Host cell
Answer  Explanation 

ANSWER: Virus

Explanation:
No explanation is available for this question!


25)   A genomic library is a collection of

a. Bacterial clones
b. Bacteriophage clones
c. Viral clones
d. Both a and b
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


26)   A single stranded nucleotide sequence that will hybridize into a certain piece of DNA is

a. Primer
b. Probe
c. Genome
d. Both a & b
Answer  Explanation 

ANSWER: Both a & b

Explanation:
No explanation is available for this question!


27)   Which statement is not true about PCR?

a. Developed by Kary Mullis
b. Take its name from DNA polymerase
c. Is not very specific
d. Taq polymerase is used
Answer  Explanation 

ANSWER: Is not very specific

Explanation:
No explanation is available for this question!


28)   Taq polymerase is extracted from a bacterium

a. Floral aquaticus
b. Taq aquaticus
c. Thermus floral
d. Thermus aquaticus
Answer  Explanation 

ANSWER: Thermus aquaticus

Explanation:
No explanation is available for this question!


29)   DNA analysis is done to

a. Diagnose viral infections
b. Identify criminals
c. Determine evolution
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


30)   A method of DNA sequencing in which DNA threads are chemically cut into pieces of different sizes is

a. Sanger's method
b. Maxam-Gilbert method
c. Hamilton's method
d. Vortex method
Answer  Explanation 

ANSWER: Maxam-Gilbert method

Explanation:
No explanation is available for this question!


31)   Human genome is ______ times larger than any other genome sequenced so far

a. 45
b. 35
c. 25
d. 15
Answer  Explanation 

ANSWER: 25

Explanation:
No explanation is available for this question!


32)   Organisms that have had a foreign gene inserted into them are

a. Transformed organisms
b. Transgenic organisms
c. Transfigured organisms
d. Recombinant organisms
Answer  Explanation 

ANSWER: Transgenic organisms

Explanation:
No explanation is available for this question!


33)   Some transgenic bacteria produce a dipeptide sweetener called

a. Ultrasweet
b. Disweet
c. Monosweet
d. Neutrasweet
Answer  Explanation 

ANSWER: Neutrasweet

Explanation:
No explanation is available for this question!


34)   Transgenic plants are produced when foreign genes are introduced into

a. Mature plant embryo
b. Immature plant embryo
c. Roots
d. Leaves
Answer  Explanation 

ANSWER: Immature plant embryo

Explanation:
No explanation is available for this question!


35)   Protoplasts are plant cells from which

a. Cell walls are removed
b. Nucleus is removed
c. New organelles are added
d. Vacuoles are taken out
Answer  Explanation 

ANSWER: Cell walls are removed

Explanation:
No explanation is available for this question!


36)   A weed engineered to produce a biodegradable plastic in cell granules is

a. Mouse-cat cress
b. Mouse weed
c. Mouse-eared cress
d. None of these
Answer  Explanation 

ANSWER: Mouse-eared cress

Explanation:
No explanation is available for this question!


37)   An antibody made by soybeans can be used to treat

a. Herpes zoster
b. Sickle cell anemia
c. Measles
d. Genital berpes
Answer  Explanation 

ANSWER: Genital berpes

Explanation:
No explanation is available for this question!


38)   In vortex method of transgenic animals gene is inserted

a. By hand
b. Into egg
c. Both by hands and into eggs
d. Is not applicable
Answer  Explanation 

ANSWER: Into egg

Explanation:
No explanation is available for this question!


39)   For biotechnology products which is the preferable vehicle

a. Urine
b. Milk
c. Sweet
d. Hairs
Answer  Explanation 

ANSWER: Urine

Explanation:
No explanation is available for this question!


40)   Cumulus cells are those that

a. Remain with follicular cells after ovulation occurs
b. Form corpus luteum
c. Form lining of the ovary
d. Cling to the egg after ovulation occurs
Answer  Explanation 

ANSWER: Cling to the egg after ovulation occurs

Explanation:
No explanation is available for this question!


41)   Two methods for gene therapy are

a. In-vivo and ex-vitro
b. Ex-vivo and in-vivo
c. Both of these
d. None of these
Answer  Explanation 

ANSWER: Ex-vivo and in-vivo

Explanation:
No explanation is available for this question!


42)   In cystic fibrosis patient lacks a gene for the transmembrane carrier of the

a. Magnesium ion
b. Calcium ion
c. Cholesterol
d. Chloride ion
Answer  Explanation 

ANSWER: Chloride ion

Explanation:
No explanation is available for this question!


43)   Plasmid do not carry gene for

a. Antibiotic resistance
b. Fertility
c. Growth
d. Both b and c
Answer  Explanation 

ANSWER: Growth

Explanation:
No explanation is available for this question!


44)   Full set of genes of an individual is called

a. Genotype
b. Genomic library
c. Genome pool
d. Genome
Answer  Explanation 

ANSWER: Genome

Explanation:
No explanation is available for this question!


45)   Substance used to terminate DNA at different points in Sanger's method is

a. Deoxyribonucleotide triphosphate
b. Dideoxyribonucleotide triphosphate
c. Deoxyribonucleotide triphosphate
d. Dideoxyribonucleoside triphosphate
Answer  Explanation 

ANSWER: Dideoxyribonucleoside triphosphate

Explanation:
No explanation is available for this question!


46)   Transgenic bacteria are produced in large vats called

a. Transducer
b. Biomultiplier
c. Bioreactor
d. Culture media
Answer  Explanation 

ANSWER: Bioreactor

Explanation:
No explanation is available for this question!


47)   Which of the following is correct about SCID?

a. Common in children as well as in adults
b. It is an immune disorder
c. Is due to deficiency of adenosine diaminase
d. Both b and c
Answer  Explanation 

ANSWER: It is an immune disorder

Explanation:
No explanation is available for this question!


48)   Tissue culture does not involve

a. Growth of tissue in artificial medium
b. Asexual reproduction
c. Use of meristem
d. Use of generative nucleus in pollen culture
Answer  Explanation 

ANSWER: Use of generative nucleus in pollen culture

Explanation:
No explanation is available for this question!


49)   Plants are totipotent because

a. Each cell has full genetic potential of the organism
b. A single cell could become a complete plant
c. Both a and b
d. Because they have lesser potential for tissue culturing
Answer  Explanation 

ANSWER: A single cell could become a complete plant

Explanation:
No explanation is available for this question!


50)   Coconut milk contains the plant hormone

a. Auxins
b. Cytokinins
c. Gibberallins
d. All of these
Answer  Explanation 

ANSWER: Cytokinins

Explanation:
No explanation is available for this question!