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PROTEIN SYNTHESIS
1- The figure shown bellow shows the various stages of protein synthesis, also known as the central dogma.
DNA mRNA Protein
Which of the following combinations correctly describes the order of events of protein synthesis ?
A) replication transcription translation
B) translation replication transcription
C) replication translation transcription
D) transcription translation replication
E) transcription replication translation
2-The figure above summarieses the event of protein synthesis. Which of the following can not be concluded from the figure above ?
A) Three types of RNA are involved in protein synthesis
B) RNA is coded from DNA
C) m-RNA transmits the genetic code to the ribosomes
D) Amino acid are ordered according to the codes of mRNA
E) mRNA performs the same functions as t-RNA
3-Which of the following combinations correctly describes structure involved in heredity in ascending order of size ?
A) nucleotide codon gene chromosomes
B) codon nucleotide gene chromosomes
C) codon nucleotide gene chromosomes
D) chromosomes gene nucleotide codon
E) codon chromosomes gene nucleotide
4- In DNA triplet code, which of the following is true?
a) Each codon codes for three aminoacida
b) Each gene codes for three protein
c) It takes three genes to code for one protein
d) Each triplet has any different meanings
e) Each aminoacid in a protein is coded for by three bases in the DNA
5- An anticodon is part of ;
a) DNA b) tRNA c) mRNA d) A ribosome
e) An aminoacid activating enzyme
6- Which component is not directly involved in translation?
a) DNA b) tRNA c) mRNA d) A ribosome
e)An aminoacid activating enzyme
7- Polysomes are :
a) Groups of ribosome reading the same mRNA simultaneously
b) Ribosomes containing more than 2 subunits
c) Multiple copies of ribosomes associated with giant chromosomes
d) ribosomes associated with more than one tRNA
e) Aggregates of vesicle containing ribosomal RNA
8- the maximum number of different tRNAs possible in a cell is mostly likely,
a) 4 b) 16 c) 20 d) 32 e) 61
9- Which of the following DNA mutations represent the most potentially damaging to the protein specifies?
a) A base pair delation b) A codon substitution
c) A codon deletion d) A substitution in the last base of codon
e) All have potential for demage
10-
a- mRNA is attached to ribosomes
b- mRNA moves from the nucleus to cytoplasm
c- tRNA molecules carring aminoacids arrange themselves along the mRNA template
d- mRNA separates from the DNA strand along which it was synthesized
Which of the following represent the correct sequence of the steps listed above, leading to the formation of a protein in a eukaryotic cell?
a)e-b-a-c-d b)d-b-a-c-e c)b-d-c-a-e d)d-e-c-b-a e)a-d-e-c-b
11- The process of creating a strand of messenger RNA from a DNA
gene template is called
a. translation
b. transcription
c. remuneration
d. zipping
e. stranding
12. The process of decoding messenger RNA to produce a protein
is called
a. translation
b. transcription
c. zipping
d. translocation
e. transduction
13. Messenger RNA moves from the nucleus to the cytoplasm in eukaryotes
by passing through
a. flagella
b. endoplasmic reticulum
c. golgi material
d. nuclear pores
e. ribosome black holes
14-Which of the following doesnt have a role in protein synthesis?
a) Amino acid b) Enzyme c) ATP d) Ribosoeme e) Ammonia
15- What would be the sequence of bases for the two anticodons that correspond to the codon base sequence of 5-UGC-GGA-3?
A- 5-TCC-GCA-3
B- TCG-CCT
C- 5-UCC-GCA-3
D- TGG-CCU
E- ACC-GGU
16-When mRNA leaves the cells nucleus, it next becomes associated with:
B) endoplasmic reticulum
C) a ribosome
D) proteins
17-Anticodons are found in
A) Messenger RNA (mRNA)
B) Transfer RNA (tRNA)
C) Ribosomes
D) DNA
E) Proteins
18-Which of the following doesnt take role in protein synthesis?
A) Nuclear membrane
B) Aminoacid
C) Ribosome
D) RNA
E) Genes
19-Two molecules of DNA molecules are given aside.
A T G C A T
T A C G T A
If mRNA molecule is synthesised from the II. Strand of this molecule, What must be the anticodons of tRNA according to this mRNA strand (molecule)?
A) TAC, GTC
B) AUG, CAU
C) UAC, GUC
D) ATC, CUG
E) GCC, UUA
20-Proteins are never made directly from the information stored within DNA. rather information passes through an RNA intermediate before it is used to string together amino acids in a specific sequence. What is the name of the enzyme that is responsible for making that RNA intermediate?
a.RNA polymerase b.tRNA synthase c.RNase d.transcriptase e.ribosomes
21-All tRNA molecules share two important features: 1) at the 3 end of the molecule they process the sequence CCA to which amino acids are covalently bonded and 2) in their middle each bears a loop containing three nucleotides that base pair with a codon. What are these nucleotides called?
a.amino-acyl tRNAs b.anticodons c.stop codons d.translational stop sites e.the coding regions of a cell
22-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