Answer Key 2.doc

1. Which is not non-ionizing radiation? a. UV irradiation b. X-rays c. Gamma rays d. Cosmic rays 2. Which of the following cell organelle as structural component contain RNA in eukaryotes? a. Lysosomes b. Golgibody c. Endoplasmic reticulum d. Ribosomes 3. Which processes are shown by W, X, Y and Z in the following figure?

a. W=Replication, X=Translation, Y=Trancription and Z= Reverse transcription b. W=Transcription, X=Replication, Y=Translation and Z= Reverse transcription c. W=Replication, X=Transcription, Y= Reverse transcription and Z=Translation d. W=Replication, X= Reverse transcription, Y=Translation and Z= Transcription 4. What are number of chromosomes (2n) in yeast Saccharomyces cerevisiae? a. 8 chromosomes b. 6 chromosomes c. 16 chromosomes d. 20 chromosomes 5. Who proposed a molecular definition of a gene in 1940 after exposing spores of the fungus Neurospora crassa to X-rays known to damage DNA and cause alterations in DNA sequence? a. Watson and Crick b. Jacob and Monad c. Beadle and Tatum

d. Wilson and Franklin 6. Which of the following the genome of prokaryotic organism first of all completely sequences? a. Mycoplasma b. Archeabacteria c. Escherichia coli d. BGA 6. Which organism has linear DNA molecule? a. Escherichia coli b. Pseudomonas putida c. Mycoplasm gallisapticum d. Drosophilla melanogaster 7. Which of the following virus group has the single stranded RNA genomes? a. Ø X 174 bacteriophage and λ virus b. HIV and bacteriophage Qβ c. T4 bacteriophage and influenza virus d. TMV and FMD virus 8. What is called the region of circular DNA chromosome of E. coli cell that are free in the cytosol? a. Nucleus b. Nucleosome c. Nucleoid d. Nucellus 9. Which of the following cell organelles contain self circular DNA in eukaryotes? a. Mitochondria and Lysosomes b. Chloroplast and Mitochondria c. Chloroplast and Endoplasmic reticulum d. Ribosomes and Lysosomes 10. Which of the following cell organelle contain RNA in eukaryotes? a. Lysosomes b. Golgibody c. Endoplasmic reticulum d. Ribosomes 11. What is size of mitochondrial DNA (mtDNA) in human? a. 4630 bp

b. 5386 bp c. 3.2 X 109 bp d. 16,569 bp 12. Which of the following statement is not true about mitochondrial DNA? a. Plant cell mtDNA ranges in size from 200,000 to 2,500,000 bp b. mtDNA is replicated after and during division c. Mitochondrial DNA codes for the mitochondrial tRNAs and rRNAs d. Number of mtDNA copies in plant cell is more than animal cell 13. Which of the following enzymes are shown by W, X, Y and Z involved in different biological processes?

a. W=DNA polymerase III, X= Reverse transcriptase, Y= RNA polymerase and Z= Peptidyl transferase b. W=RNA polymerase III, X=DNA polymerase, Y=Reverse transcriptase and Z= Peptidyl transferase c. W=DNA polymerase III, X= Peptidyl transferase, Y= RNA polymerase and Z= Reverse transcriptase d. W=DNA polymerase III, X=RNA polymerase, Y=Reverse transcriptase and Z= Peptidyl transferase