<p>1.the production of different cell types in a mutlicelloular organism is regulated by which of the following mechanism ?
(A)Ribosomes preferentially translate some mRNA and not others.
(B)proteins present in the cytoplasm are degraded at different rates
(C) specific sets of mRNA are produced in a particular cell type.
(D)specific mRNA in the cytoplasm must be modified to allow their translation
(E) only some RNA are modified and transported to the cytoplasm.</p>
<p>2.during conjugation between two bacterial cells the DNA of the chromosome of one cell is transferred to the other. If conjugation is interrupted only portion of the DNA is transferred ,the procedure of interrupting conjugation can be used to determine the :
(A)Position of genes in the DNA
(B)Presence of sex linked factors
(C)number of chromosomes
(D)occurrence of polyploidy
(E)species of the bacteria</p>
<p>3.which of the following occurs in the cell nucleus :
I.RNA synthesis
II.Protein synthesis
III.DNA synthesis
(A)I Only
(B)II Only
(C) III Only
(D)I and II
(E) I,II and III</p>
<p>4.What is the evidence that genes encode the amino acid sequence of protein ?
(A)Protein are Macromolecule
(B)RNA directs amino acid synthesis
(C) the amino acid sequence of polypeptides is changed by gene mutation
(D)DNA serve as a template for RNA
(E)mRNA is found in the ribosome</p>
<p>(A)Mrna
(B)rRNA
(C)Trna
(D)dna
(E)nucleus
5.site of rRNA synthesis
6..Product of transcription ,encoding translated protein
7.Bind specific amino acids and carries them to the ribosome during protein synthesis</p>
<p>8.Translocation normally requires :
(A)Ribosome
(B)ribosome and tRNA
(C) ribosome , Trna and mRNA
(D)Ribosome ,tRNA,mRNA and amino acid
(E)Ribosome , tRNA,mRNA,amino acid and polymerase</p>
<p>9..the process of transferring RNA is known as:
(A)Translocation
(B)Transformation
(C)transcription
(D)Transduction
(E)Transpiration</p>
<p>10.Haemophiles influenza DNA is made up of about 1,800 Kilobase pairs organized into about 1.750 genes,the DNA is rich in cytosine</p>
<p>11.if the genes of H.influenza were all located on a single strand of the double helix and were adjoining one another end to end ,an average gene would include approximately How many bases ?
(A) 10
(B)100
(C)1,000
(D)10,000
(E)1,000,000</p>