Welcome to your Eduqas Component 2 Quizz 2 Conversion of available energy into biomass by organisms of a trophic level is determined by NPE TLTE NPP GPP The correct sequence of species which appear from primary succession to climax among the following are: (a) Shrubs & bushes (b) Grasses and herbs (c) litchens & mosses (d) Ash & oak (c),(b),(a),(d) (a),(b),(c),(d) (d),(c),(a),(b) (b),(a),(d),(c) Excessive release of CO2 due to fossil fuel burning leads to which of the following problems in the sea waters? Acidification of sea water. Desalination of sea water Evaporation of sea water at a faster rate Over-salination of sea water Amazon rainforest burning is a classic example of People reaching the conclusions & making decisions are not concerned about climate change Lack of knowledge to prevent bushfires Global warming not being proven scientifically Sustainable development All the plants, animals in aforest make a Community Ecosystem Biosphere Lithosphere Final spot in any food web is taken by decomposers producers tertiary consumers herbivores Typical transfer of biomass between consecutive levels is about 10% 40% 60% 30% Quadrats and transects are used for "For assessing abundance and distribution of organisms in a natural habitat " For trapping wild animals For tagging wild animals For captive breeding Net Primary Productivity is calculated as GPP – R GPR – R I – (F + R) I + (F - R) Large trees in forests are climax community pioneer species mutants homogygous One of the impacts of overfishing is Reduced Harvests of Targeted Fish Increased Harvests of Targeted Fish Exponential increase in other marine organisms Exponential decrease in all fish populations Complete set of genetic make up of an individual is called Genome Gene Chromosome DNA Alternative splicing acts as a mechanism of gene regulation gene manipulation transcription translocation Nucleosomes are formed by Wrapping of DNA on Histone proteins Wrapping of RNA on Histone proteins Wrapping of histidine on Histone proteins Wrapping of chhromosome on Histone proteins Epigenetic modifications can result in the transformation of totipotent to pluripotent stem cells totipotent to multipotent stem cells multipotent to pluripotent stem cells pluripotent to totipotent stem cells Gene guns can be used as vectors for recombinant technology vectors for DNA Ligase enzyme vectors for plasmid vectors for influenza Studying and modeling of different human diseases is based on Knockout mice Knockdown mice Sterile mice White mice One of the disadvantages of GM crops are genes resistant to antibiotics herbicide resistance lower production lower shelf-life Select the correct order of DNA fingerprinting. Isolation,fragmentation,seperation,comparison Fragmentation,seperation,comparison,isolation Isolation,comparison,seperation,fragmentation Isolation,fragmentation,comparison,seperation Which is not a method of producing DNA fragments? Examination of an electropherogram. Conversion of mRNA to complementary DNA (cDNA) using reverse transcriptase. Cutting the gene in a 'gene machine'. Using restriction enzymes to cut the DNA into fragments. Why is splicing not required in prokaryotes? Prokaryotes don't have introns Prokaryotes don't have nucleus. Prokaryotes don't have mRNA Prokaryotes don't have tRNA Identify the parts that get removed during post-transcriptional modifications Introns Extrons Exons pre-mRNA In the procedure of PCR, What are the temperature conditions maintained for binding of DNA primers with DNA strands? Heating to 95 °C followed by cooling to 55 °C Maintaining 72 °C throughout Cooling to 15 °C followed by heating to 55 °C Alternative cycles of heating & cooling at 65 °C and 35 °C Which of the following is not a factor for determining Time of Death through forensics Body color Muscle contraction Identifying life stage of insects colonising the body Body temperature MN blood groups of humans are examples of Codominance Multiple alleles Heterozygous Phenotype A recessive allele is only expressed when The opposing dominant allele is absent Accompanied by any dominant allele The opposing recessive allele is absent Opposing dominant allele is present A recombination frequency of 0.5 indicates 50 percent of offspring are recombinants and the other 50 percent are parental types 0.5 percent of offspring are recombinants 0.5 percent of offspring are parental types Every type of allele combination is represented with 0.5 frequency The chromosomes which are not autosomes are X & Y both XX XY X only Hemofilia vectors are Human females Human males Female mosquito Male mosquito An example of continuous variation. Height Blood group Gender (male/female) Eye colour In Siamese cats, dark hair develops where the skin is at relatively low temperature. This is an example of Environmental effects on the phenotype Genetic mutation Independant assortment of chromosomes Effects on the phenotype due to random mating between organisms within a species. Where more than one gene contol inheritance of character it is called polygenic inheritance monogenic inheritance oligogenic inheritance environmental inheritance DNA sequence of human and chimpanzees share about 94% similarity 90% similarity 99% similarity 95% similarity
