Welcome to your OCR A2 Biology 2 1. Induced pluripotent stem cells (iPS cells) can be produced from ____________. Blood cells Germ cells Fat cells Adult somatic cells2. A process which does not facilitate natural selection. Predation Disease Competition Artificial breeding3. The primary source of genetic variation within a population of a species. Mutation Meiosis Environmental factors Sexual reproduction4. Choose the correct order of formation. Community-population-ecosystem Population-community-ecosystem Population-ecosystem-community Ecosystem-community-population5. Which of the following geographical barriers can lead towards allopatric speciation? a) Rivers b) Mountain ranges c) Continental drift d) Small pond b & c only a, b & c a, c & d b & d6. A disorder caused by gene mutation. Sickle cell anemia ADHD Pneumonia Tuberculosis7. Select the incorrect statement regarding allopatric speciation. Very small or immobile organisms can be isolated by smaller-scale barriers. 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. Species of plants and animals in Hawaiian islands is not an example of allopatric speciation.8. A behavioural barrier which could cause sympatric speciation. Mating dances Salinity Different habitats pH9. Select the incorrect statement about frameshift mutation. Insertions and deletions result in frame shift mutations. Completely different amino acids are coded because of frameshift mutation. The resulting protein is usually functional. Insertions could increase the number of times a nucleotide sequence is repeated.10. A process which does not facilitate natural selection. Predation Artificial breeding Disease Competition11. 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? 36% 46% 42% 50%12. 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 only a, c & d All13. Change in allele frequencies due to a new environmental factor or a new allele. Directional selection Disruptive selection Stabilising selection Natural selection14. An example of multipotent cells. Stem cells found in bone marrow Stemcells found in gut Stem cells found in skin Stemcells found in heart15. Which type of stem cells are used in treating human disorders? Unipotent Multipotent Pluripotent Totipotent 16. 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? 13 14 12 1517. Unique species of plants and animals in the Hawaiian and Galapagos islands is an example of ____________. Extinction Natural selection Allopatric speciation Sympatric speciation18. Which of the following is not a mutagen? Radioactive decay Ionizing radiations UV radiations Alcohol19. Which disorder proves to be an example of the relationship between a gene, an enzyme and a human phenotype? Albinism Huntington's disease Colour blindness Down syndrome20. A mutated gene that causes cancer. Leukogene Nanogene Hepatogene Oncogene21. The mark-release-recapture method of sampling is used among __________. Motile organisms Only deers Non motile organisms Motile and non motile organisms
