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DNA
1-Which of the following statement describing properties of the genes is wrong ?
A- Located only in nucleus B- Arrage on chromosomes
C- They can replicate itself D- They can be mutated
E- Transfered to offsprings by gametes
2-All of the following are found in DNA EXCEPT
A)Adenine B)Thymine C)Guanine
D)Uracil E)Phosphodiester Bond
3-Which of the following is different in the structure of DNA and RNA ?
A) Phosphoric Acid B) Adenine C) Pentose D) Guanine E) Cytosine
4- A DNA molecule includes 2400 nucleotides There are 300 adenine in this DNA.How many hydrogen bond are there in this DNA.
A) 2300 B) 6000 C) 5400 D) 3300 E) 2400
5- One similarity of DNA and RNA molecules in that they both contain
A) Nucleotides B) ATP C) Thymine
D) Deoxyribose E) Double Helix
6- Which could be the sequence of a DNA code ?
A) CAUGG B) AUGGA C) TUGGA
D) ACGTA E) UGCGA
7- In one strand of DNA there are 607 A , 703 C , 508 G and 105 T nucleotides.What is the total percentage of adenine and cytosine nucleotides in relation to the total amount of nucleotides in DNA ?
A) 16 % B) 30 % C) 43 % D) 50 % E) 67 %
8- All nucleotides have
A) Uracil B) Deoxyribose C) Phosphores Groups D) Thymine E) Ribose
9- A DNA molecule includes 2000 nucleotides.There are 300 guanine in this DNA.How many hydrogen bond are there in this DNA.
A) 3300 B) 2300 C) 4400 D) 2200 E) 1300
10- Which of the following phrases is NOT true of DNA?
A)molecule formed from deoxyribose,phosphate and nitrogen bases
B) nucleotides joined by their bases to form a ladder
C) molecule coiled in a double helix
D) bases separate prior to replication
E) nucleotide formed from ribose, phosphate and nitrogen bases
11- If 30% of the bases of a certain segment of DNA are cytosine, then what percent of the bases are thymine?
A) 20 B) 30 C) 60 D) 40 E) 70
12- Process by which DNA builds an exact copy of itself
A)DNA B) Codon C) Mrna D) Replication E) Trna
13-Examine the following list of molecules.
I-Sugar II-Nitrogenous Base III-Vitamin
IV-Phosphoric acid
Which combination of the molecules above participates
the structure of nucleotıdes ?
A-I and II B-III and IV C-I,II and III
D-I,II and IV E-II,III and IV
14- Examine the list of molecules below.
I-Pentose sugar II-Nitrogenous base
III-Amino acid IV-Vitamin
V-Phosphoric acid
Which of the above molecules participates to structure of nucleotides.
A) 1,3 B) 3,4,5 C) 1,2,3 D) 1,2,4 E) 2,3,5
15- Which of the following does not participates to the structure of a chromosome ?
A)nucleotides B)protein C)gene D)phosphate E)glycerol
16- What is the primer that is required to initate the synthesis of new DNA strand ?
a) DNA b) Protein c) RNA d) DNA ligase e) Helicase
17-Which of the following statements does not apply to the Watson and Crick model of DNA ?
a) The 2 strands of the DNA are antiparallel
b) There are 10 nucleotide pairs per turn of the helix
c) the framework of the helix consists of sugar-phosphate unit of the nucleotides
d) The 2 strands of the helix are held together by covalent bonds
e) the purins are attrached to pyrimidines.
18- The enzymes which unwinds the parental strands of the DNA is called:
a) Primase b) Helicase c) Topoisomerase d) DNA ligase e) DNA polymerase
19- All of the following statements about DNA or RNA are true except
a) thymine is found in DNA but not RNA
b) The DNA is circular in bacteria
c) RNA and DNA are composed of nucleotides
d) mRNA codes for a protein
e) A cell has 61 different types of mRNA but only one type of tRNA
20- 15. A DNA molecule is found to contain total 2400 nucleotides, if there are 600 adenine nucleotides, how many cytosine nucleotides would be expected?(Melike)
a. 800 b. 700 c. 600 d. 900
21- Which of the following cant be found in DNA? (Sümeyra)
a. adenine b. guanine c. uracil d. cytosine
22-. A sequence of nucleic acid, such as DNA, that codes for a protein.
a. transfer RNA (tRNA)
b. messenger RNA (mRNA)
c. ribosome
d. RNA polymerase
e. gene
23- A combination of DNA and histone protein.
a. lysosome
b. centriole
c. plasmalemma
d. vacuole
e. chromatin
24- The variable portion of a DNA nucleotide is at its:
A). Base B). Sugar C). Phosphate Group D). Ribose E). Deoxyribose
25-.If a DNA- coding triplet for an amino acid is TAC, which of the following would be the complementary coding triplet in messenger RNA?
(A) TAC (B) CAT (C) AUG (D) TUG (E) ATG
26--I Adenine base
III Phosphoric acid
IV Urasil base
Which of the above molekules can be found both in DNA and RNA?
A) II, III
B) I, II, III,
C) I, III, IV
E) None of them
27--There are 1800 nucleotides in a DNA molecula. 300 of them are thymine.
What are the ratio of adenine, guanone and cytosine nucleotides in this DNA molecule?
A) 1/3 A, 1/4 G, 1/4C
B) 1/6 A, 1/3 G, 1/3C
C) 1/6 A, 1/8 G, 1/8C
D) 1/6 A, 1/8 G, 1/4C
E) 1/3 A, 1/6 G, 1/4C
28- One strand of DNA that molecule has a nucleotide sequence TAACGTA. Its complementary DNA strand will have a sequence that reads:
A) AUUGCAU
B) CGGTACG
C) ATTGCAT
D) ATGCAAT
29-Duplication of DNA occurs
A) twise, before meiosis I and meiosisII
B) before meiosis II only
C) during interphase
D) during prophase I
30- One chromosome consist of
A) two DNA strands, one contributed by the mother and one by the father.
B) One DNA strand, either from the mother or the father
C) Four DNA strands, two from the mother and two from the father
D) None of the above
31-The first step in DNA replication is
A) the separation of double stranded DNA using an enzyme
B) the removal of nitrogenous bases from one strand of DNA
C) base-pairing
D) the making
E) of an RNA molecule
32- Which of the following can be found in the structure of DNA and RNA?
A) Phasphate
B) Ribose sugar
C) Deoxyribose sugar
D) Uracilbase
E) Thymine base
33- A DNA molecule made of 1200 nucleotides. If the ratio of Thymine nucleotides in this molecule is ¼, what is the number of A, T, C and G nucleotides.
A T G C
A) 100 100 200 200
B) 200 200 300 300
C) 200 200 200 200
D) 300 300 300 300
E) 400 400 400 400
34-One similarity of DNA and RNA molecules is that they both contain
A) a double stands
B) nucleotides
C) deoxyribose sugar
D) thymine
E) no one
35- All of the following are found in a DNA molecule exept
A) cytosine
B) guanine
C) adenine
D) uracil
E) phasphate group
36- A combination of phosphate, ribose and a nitrogen base is characteristic of a
A) nucleotide
B) lipid
C) protein
D) fatty acid
E) carbohydrate
37-)Griffith found that Streptococcus pnemoniae that formed smooth colonies were capable of killing mice but that bacteria from rough colonies could not. What would he have found if he had infected mice with a mixture of just the DNA of the smooth bacteria and living rough cells?
a.The mice wouldnt become ill b.The mice would always die
c.The mice would become sterile d.The mice would be ill but not contagious
38-A combination of DNA and histone protein is a
A.Gene B.Polymerase C.Polypeptide D.Chromosome
39-)A sequence of three DNA or mRNA nucleotides, such as GCG
A.constitutes a codon b.encodes for three amino acids c.both a and b
40-Bacterial genomes consist of
a.circular single stranded RNA b.circular double stranded DNA c.linear triple stranded RNA d.zig-zag formations of DNA
41)Dna is composed of all of the following EXCEPT:
a.ribose sugar b.phosphate c.puriness d.pyrimidines
42)RNA differs from DNA in that RNA contains_______ whereas DNA contains _________.
a.adenine, thymine b.thymine, uracil c.guanine, cytosine d.uracil, thymine
43-)Which one of the following bonding patterns is MISMATCHED?
a.A:::T b.C:::G c.U:::T d.G:::C
44-)The repeating unit within polynucleotides is itself made of three smaller units: a phophate group, a sugar, and one of five nitrogeneous bases. What is the primary difference between the sugar of RNA and DNA?
A.The sugar of RNA has one more hydroxyl group than the sugar of DNA.
B.The sugar of RNA has one more carbon aton in it than the sugar of DNA.
C.The sugar of DNA has one more carbonyl group than RNAs sugar.
D.The sugar of DNA can branch with other sugars while RNAs can not.
E.The sugar of DNA has two rings while the sugar of RNA has only one