ETEA PAST PAPER 2020 ( PART 18 ) 1. The organs which are similar but differ in structure are called Homologous organs Analogous organs Divergent evolution Convergent evolution 2. ____ occurs because natural selection gives some alleles a batter chance of survival than others Fitness Artificial selection Evolution Crossing over 3. The DNA that has been altered and which now contains length of nucleotides from two different organisms is called a Recombinant DNA Vector Plasmid Combined DNA 4. It is a method for rapid production of a very large number of copies of a particular fragment of DNA Recombination Gel electrophoresis Polymerase chain reaction DNA extraction 5. What is the effect of DNA ligase? DNA fragments are joined together DNA transcription occurs DNA replication occurs DNA is broken up at specific sits 6. Which of the following is the components/ tools of recombinant DNA technology? Gene of interest Molecular glue and expression system Molecular scissors All of the above 7. Gel electrophoresis is a technique Collect all the genes found in one complete set of chromosomes Grows single cells of a group of cells in a glass ware on artificial medium under aseptic conditions Employed by forensic scientists to assist in the identification of the individuals by their respective type of DNA Is a technique to separate different size fragment of charge bearing polymers (proteins, RNA or DNA) 8. Transgenic organisms Are considered beneficial to humans All of the above Have an important role in the large scale production of medicinal products Have a foreigh gene inserted into them 9. Which of the following is not necessary for PCR to occur? ATP Ribonucleotides DNA fragments Primers 10. This theory says that “mitochondria and chloroplast area in effect ancient bacteria which now live inside the large cells” Darwin’s theory of evolution Endosymbiont theory Lamarckism Neo-Darwinism Loading … Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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