Welcome to your OCR A2 Biology 2 1. Choose the correct order of formation. Community-population-ecosystem Ecosystem-community-population Population-ecosystem-community Population-community-ecosystem2. A disorder caused by gene mutation. Pneumonia Sickle cell anemia ADHD Tuberculosis3. Which of the following geographical barriers can lead towards allopatric speciation? a) Rivers b) Mountain ranges c) Continental drift d) Small pond b & d a, b & c b & c only a, c & d4. A behavioural barrier which could cause sympatric speciation. pH Different habitats Salinity Mating dances5. Which type of stem cells are used in treating human disorders? Totipotent Multipotent Pluripotent Unipotent6. A mutated gene that causes cancer. Oncogene Nanogene Hepatogene Leukogene7. Which of the following is not a mutagen? Alcohol UV radiations Radioactive decay Ionizing radiations8. Select the incorrect statement about frameshift mutation. Completely different amino acids are coded because of frameshift mutation. Insertions could increase the number of times a nucleotide sequence is repeated. Insertions and deletions result in frame shift mutations. The resulting protein is usually functional.9. Select the incorrect statement regarding allopatric speciation. Species of plants and animals in Hawaiian islands is not an example of allopatric speciation. Species of plants and animals in Galapagos islands is an example of allopatric speciation. Allopatric speciation is when new species arise due to isolation of a population by geographical barriers. Very small or immobile organisms can be isolated by smaller-scale barriers.10. A process which does not facilitate natural selection. Competition Artificial breeding Disease Predation11. Which disorder proves to be an example of the relationship between a gene, an enzyme and a human phenotype? Huntington's disease Albinism Down syndrome Colour blindness12. Change in allele frequencies due to a new environmental factor or a new allele. Directional selection Disruptive selection Natural selection Stabilising selection13. The mark-release-recapture method of sampling is used among __________. Motile organisms Only deers Motile and non motile organisms Non motile organisms14. An example of multipotent cells. Stem cells found in bone marrow Stemcells found in heart Stem cells found in skin Stemcells found in gut15. Unique species of plants and animals in the Hawaiian and Galapagos islands is an example of ____________. Extinction Allopatric speciation Natural selection Sympatric speciation16. A process which does not facilitate natural selection. Predation Disease Artificial breeding Competition17. Select the correct statements from the following. a) Fish populations can be preserved if quotas are observed. b) Bioaccumulation is when plants are produced in large numbers within an ecosystem. c) Forests can be preserved if the trees are replanted. d) Sometimes there are tensions between conservation efforts and the needs of local communities. a, b & c a, c & d All a & c only18. A group of scientists found out the estimated number of meerkats in an area to be 2992 using the mark-release-capture technique. The number caught and marked in the first sample was 151. The number caught in the second sample was 240. How many was marked in the second sample? 12 14 15 1319. Induced pluripotent stem cells (iPS cells) can be produced from ____________. Adult somatic cells Germ cells Fat cells Blood cells20. The primary source of genetic variation within a population of a species. Mutation Sexual reproduction Meiosis Environmental factors21. Within a population of rabbits, the colour black (B) is dominant over the colour white (b). And, 30% of all rabbits are white. What is the percentage of heterozygous rabbits in the population? 42% 46% 36% 50%Time is Up!