Genetics Material Test 4

Total Questions:50 Total Time: 60 Min

Remaining:

 

Questions 1 of 50

Question:The strongest evidence that DNA is the genetic material comes from:

Answers Choices:

the finding that DNA is not present in the cytoplasm

the knowledge that DNA is present in the nucleus

the fact that chromosomes are made of DNA

studies on the bacterial transformation

Questions 2 of 50

Question:Pneumococcus experiment proved that:

Answers Choices:

Bacteria undergo binary fission

Bacteria do not reproduce asexually

RNA may sometimes control production of DNA and proteins

DNA is the genetic material

Questions 3 of 50

Question:The transforming principle of Pneumococcus as found out by Avery, MacLeod and McCarty was:

Answers Choices:

Protein

DNA

Polysaccharide

mRNA

Questions 4 of 50

Question:The process in which DNA of a bacterial cell is transferred into another bacterial cell through a virus is:

Answers Choices:

Transduction

Transformation

Conjugation

Reproduction

Questions 5 of 50

Question:Which of the following scientists demonstrated that in DNA A = T and G = C ?

Answers Choices:

Griffith

Chargaff

Meselson and Stahl

Hershey and Chase

Questions 6 of 50

Question:If 30% of an organism's DNA is thymine, then:

Answers Choices:

70% is purine

20% is guanine

30% is adenine

both (2) and (3) are correct

Questions 7 of 50

Question:Watson and Crick are known for their discovery that DNA:

Answers Choices:

is a single stranded helix

contains deoxyribose only

is a double stranded helix

syntheses rRNA

Questions 8 of 50

Question:The double-helix model of DNA resembles a twisted ladder in which the rungs of the ladder are:

Answers Choices:

a purine paired with a pyrimidine

A paired G and C paired with T

sugar-phosphate paired with sugar-phosphate

both (1) and (2) are correct

Questions 9 of 50

Question:What is true of Watson and Crick's model of DNA. It is duplexed with:

Answers Choices:

20 base pairs and 34 A for each turn

10 base pairs and 34 A distance for every turn

10 base pairs and 3.4 A distance for each turn of spiral

none of the above

Questions 10 of 50

Question:Width of DNA molecule is:

Answers Choices:

15 angstron

34 angstron

25 angstron

20 angstron

Questions 11 of 50

Question:The 5' end of each okazaki fragment has:

Answers Choices:

ACC

AUG

Ribonucleotide

deoxyribonucleictide

Questions 12 of 50

Question:DNA having labelled thymidine is allowed to replicate in medium having non-radioactive thymidine. After three duplications, the DNA molecules having labelled thymidine shall be:

Answers Choices:

One molecule

Two molecules

Four molecules

Eight molecules

Questions 13 of 50

Question:Escherichia coli with completely radioactive DNA was allowed to replicate in non-radioactive medium for two generations. Percentage of bacteria with radioactive DNA is:

Answers Choices:

12.5

25

50

100

Questions 14 of 50

Question:During DNA replication, the sequence 5'-TpApGpAp-3' would produce which of the following complementary structures?

Answers Choices:

5'-ApTpCpTp-3'

5'-UpCpUpAp-3'

5'-TpCpTpAp-3'

5'-GpCpGpAp-3'

Questions 15 of 50

Question:The direction of DNA replication is:

Answers Choices:

from 5' end towards 3' end

from 3' end towards 5' end

amino terminus to carboxy terminus

carboxy terminus to amino terminus

Questions 16 of 50

Question:Which one of the following is a purine base?

Answers Choices:

Guanine

Thymine

Cytosine

Uracil

Questions 17 of 50

Question:Circular DNA molecules are found in?

Answers Choices:

TMV

Yeast

Volvox

Bacteria, chloroplast and mitochondria

Questions 18 of 50

Question:Which of the following does not synthesize RNA?

Answers Choices:

Reverse transcriptase

Reverse transcriptase

RNA polymerase I

RNA polymerase II

Questions 19 of 50

Question:The codon for anticodon 3'UUA5' is:

Answers Choices:

3'UAA5'

3'AAU5'

3'UUA5'

3'TTA5'

Questions 20 of 50

Question:RNA differs from DNA in having:

Answers Choices:

Adenine

Guanine

Thymine

Uracil

Questions 21 of 50

Question:Genetic code was discovered by:

Answers Choices:

Holley and Ochoa

Holley, Nirenberg and Khorana

Nirenberg and Matthaei

Watson and Crick

Questions 22 of 50

Question:Which one of the following is a non-sense codon?

Answers Choices:

AUG

GCG

AGA

UAG

Questions 23 of 50

Question:The codons causing chain termination are:

Answers Choices:

TAG, TAA, TGA

GAT, AAT, AGT

AGT, TAG, UGA

UAG, UGA, UAA

Questions 24 of 50

Question:Which of the following are polymerized to form proteins?

Answers Choices:

Amino acids

Muramic acid

Carbohydrates

Nucleic acids

Questions 25 of 50

Question:In three dimensional view, the molecule of t-RNA is:

Answers Choices:

L-shaped

S-shaped

Y-shaped

E-shaped

Questions 26 of 50

Question:Who proposed the central dogma?

Answers Choices:

Beadle and Taturn

Watson and Crick

Klug

Crick

Questions 27 of 50

Question:Transcription of DNA is aided by:

Answers Choices:

RNA polymerase

DNA polymerase

Exonuclease

Recombinase

Questions 28 of 50

Question:Antibiotic inhibiting translation in eukaryotes is:

Answers Choices:

Tetracycline

Penicillin

Chloromycetin

Puromycin

Questions 29 of 50

Question:The process of translation is:

Answers Choices:

RNA synthesis

Ribosome synthesis

DNA synthesis

Protein synthesis

Questions 30 of 50

Question:Which of the following is an enzyme used to form a phosphodiester bond in nick between a 3' end of one DNA chain and a 5' end of another?

Answers Choices:

DNA polymerase

Phosphodiesterase

Restriction endonuclease

DNA ligase

Questions 31 of 50

Question:An amino-acyl synthetase is responsible for:

Answers Choices:

joining an amino acid to a t-RNA

attaching an amino group to an organic acid

formation of a peptide bond

none of these

Questions 32 of 50

Question:Specific radioactive identification of ribosomal RNA can be achieved by using \(^{14}C\)-labeled:

Answers Choices:

thymine

cytosine

guanine

uracil

Questions 33 of 50

Question:A nucleotide consists of:

Answers Choices:

hexose sugar, nitrogen base and phosphate

hexose sugar, nitrogen base and sulphur

pentose sugar, nitrogen base and sodium

pentose sugar, nitrogen base and phosphate

Questions 34 of 50

Question:Who performed transformation experiments in bacteria

Answers Choices:

Griffith

MacLeod

Louis Pasteur

Meselson and Stahl

Questions 35 of 50

Question:What is the main function of t-RNA in relation to protein synthesis?

Answers Choices:

identifies amino acids and transport them to ribosomes

acts as proof reader

inhibits protein synthesis

all

Questions 36 of 50

Question:The chemical knives of DNA are:

Answers Choices:

Ligases

Endonucleases

Endonucleases

Transcriptase

Questions 37 of 50

Question:Polymerases Restriction endonucleases are:

Answers Choices:

present in mammalian cells for degenera­tion of DNA when the cell dies

used in genetic engineering for fighting two DNA molecules

synthesized by bacteria as part of their defence mechanism

used for in vitro DNA synthesis

Questions 38 of 50

Question:Recombinant DNA is achieved by cleaving the pro-DNA by:

Answers Choices:

Ligase

Primase

Exonuclease

Restriction endonuclease

Questions 39 of 50

Question:Wobble hypothesis was given by:

Answers Choices:

R.W. Holley

H.G. Khorana

M. Nirenberg

F.H.C. Crick

Questions 40 of 50

Question:Which of the following RNAs picks up specific amino acid from amino acid pool in the cytoplasm to ribosome during protein synthesis?

Answers Choices:

m-RNA

r-RNA

t-RNA

all of these

Questions 41 of 50

Question:Which of the following terms is not concerned with genetic recombination in bacteria?

Answers Choices:

transformation

translation

transduction

conjugation

Questions 42 of 50

Question:Transformation was first performed on which bacteria?

Answers Choices:

Escherichia coli

Salmonella typhi

Diplococcus pneumoniae

Pasteurella pestis

Questions 43 of 50

Question:Genetic informations are carried in form of long chain of molecules made of:

Answers Choices:

RNA

Amino acids

Nucleotides

Polypeptides

Questions 44 of 50

Question:Adenine + Pentose + Phosphate form:

Answers Choices:

adenosine

adenylic acid

adenosine diphosphate

adenosine triphosphate

Questions 45 of 50

Question:Select the specific base pairs of DNA:

Answers Choices:

adenine and cytosine

guanine and uracil

guanine and adenine

adenine and thymine

Questions 46 of 50

Question:Transcription takes place in:

Answers Choices:

matrix

cytosol

nucleus

cytoplasm

Questions 47 of 50

Question:A sequence of three bases code along the DNA molecule is called:

Answers Choices:

genome

genetic drift

gene pool

genetic code

Questions 48 of 50

Question:Out of 64 codons. 61 codons codes for 20 types of amino acids; it is called:

Answers Choices:

overlapping of genes

wobbling of codon

universality of codons

degeneracy of genetic code