Practise_Q_for_Ch6_on - Practise questions [Ch 6...

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Unformatted text preview: Practise questions [Ch 6 onwards] Choose the single best answer for each question. 1. Which of the following statements describes the results of this reaction? C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy A. B. C. D. E. F. O2 is reduced and CO2 is oxidized. C6H12O6 is oxidized and O2 is reduced. O2 is oxidized and H2O is reduced. CO2 is reduced and O2 is oxidized. C6H12O6 is reduced and CO2 is oxidized. More than one of the above statements describes the results of the reaction. 2. Following glycolysis and the Krebs cycle and before the electron transport chain and oxidative phosphorylation, the carbon skeleton of glucose has been broken down to CO2. Most of the energy from the original glucose at that point is in the form of ________. A. B. C. D. ATP. CO2. H2O. NADH. 3. Where are the protein complexes of the respiratory electron transport chain located? A. B. C. D. E. mitochondrial outer membrane mitochondrial inner membrane mitochondrial intermembrane space mitochondrial matrix cytosol 4. The skeletal and heart muscles and the brain are typically the regions most affected in people with mitochondrial disorders. Which of the following best explains why this is so? A. B. C. D. E. They are generally very fragile. They have the most extensive endomembrane systems of all cells. They have fewer mitochondria in the cell compared to those of other tissues. They are the most important organs. They have the highest energy needs. 5. All of the following processes are associated with photosystem I EXCEPT A. B. C. D. NADPH synthesis. splitting of water. accepting electrons flowing from the electron transport chain. cyclic electron flow. 1 Practise questions [Ch 6 onwards] 6. The Calvin cycle (light independent reactions) requires all of the following to be present EXCEPT A. B. C. D. E. NADPH. glucose. CO2. RuBP. ATP. 7. Which of the following best explains why photorespiration is more likely in warm weather? A. Plants require warm weather to drive photosynthesis. B. Plants are more likely to open their stomata in the daytime heat than at night when it is cool. C. Plants are more likely to dehydrate in warm weather, forcing them to close their stomata to conserve water; this prevents CO2 from entering the leaf. D. The rubisco enzyme is temperature sensitive & becomes less selective in warmer temperatures. 8. Steroid hormones do not require a membrane receptor because they A. B. C. D. only pass between cell junctions of adjacent cells. are soluble in the lipid bilayer. pass through special membrane channels. are water soluble. 9. In most cases, protein kinases A. B. C. D. add phosphate groups to proteins. bind cGMP. stimulate adenylyl cyclase. polymerize amino acids into polypeptide chains. 10. The reason that some individual hormones have so many different effects is that A. they are recognized by several different types of receptors in any given cell/tissue. B. they trigger a second messenger system that produces a cascade effect. C. there are many different cells in different tissues that have the specific receptor for the hormone. D. they induce transcription of sets of genes that are only present in certain types of cells. 11. The antibiotic clindamycin acts against bacterial ribosomes, preventing polypeptide (protein) elongation. When using clindamycin to treat infections, which of the following best describes the level at which we are controlling gene expression in the bacteria? A. B. C. D. Transcriptional. Post ­transcriptional. Translational. Post ­translational. 2 Practise questions [Ch 6 onwards] 12. A somatic cell divides to form two genetically identical daughter cells during mitosis. Prior to mitosis occurring, which of the following must occur? A. B. C. D. The cell must replicate its DNA. The cell must first be fertilized. The nucleus must divide. Chromatids must be separated. 13. Some plants are triploid. If a triploid plant has a chromosome number of 12, how many chromosomes are present in its somatic cells? A. B. C. D. 36 24 12 6 14. The Cdk4 protein is a human cyclin dependent kinase. A mutation in the gene that results in overactive Cdk4 is associated with certain cancers. The original (non ­mutated) cdk4 gene can best be termed: A. B. C. D. E. a proto ­oncogene. an oncogene. a tumor suppressor gene. an enhancer. Two of the above (in A through D) are appropriate terms for the original cdk4 gene. 15. Which statement best describes the difference between mitotic cell division in plant and animal cells? A. In animal cells, but not plant cells, cytokinesis is accomplished by formation of a cleavage furrow. B. In plant cells, but not animal cells, cytokinesis is accomplished by formation of a cleavage furrow. C. In plant cells, there is no nuclear envelope and only a single circular chromosome to be divided, while in animal cells linear chromosomes are in nuclei, and nuclear division occurs. D. In animal cells, mitotic division results in 2 (two) identical daughter cells, while in plant cells mitotic division yields 4 (four) identical spores. 16. Just considering the distribution (assortment) of maternal & paternal chromosomes, how many different gametes could 1 individual fruit fly (2n = 8) create? A. B. C. D. E. 128 16 8 256 64 3 Practise questions [Ch 6 onwards] 17. Which of the following statements best describes a phase that occurs in meiosis II? A. B. C. D. E. Crossing over of non ­sister chromatids occurs. Tetrads migrate to the metaphase plate. Sister chromatids separate and begin moving to opposite sides of the cell. Homologous chromosomes separate and begin moving to opposite sides of the cell. Chromosomes replicate, doubling the DNA content in the cell. 18. Convict cichlid fish colour is determined by a single autosomal gene, where grey is dominant over pink. You obtained a pair of fish, both grey, from the Biology UG Office. These fish spawn, and produce 44 offspring (32 grey and 12 pink). With respect to the colour gene, your original grey mating pair would be: A. B. C. D. E. Both homozygous for the grey allele. One homozygous for the grey allele while the other is heterozygous. Both heterozygous. Both homozygous for the pink allele. Two of the above in A through D would be possible. Trimethylaminura (TMU or “fish odor syndrome”) is caused by a recessive autosomal allele. A man and woman, both unaffected, have a child that has this condition; answer Q 19 & 20 using this information. 19. Considering this trait, what is the genotype of the child? A. B. C. D. E. heteromorphic homozygous recessive heterozygous homozygous dominant unknown; not enough information is provided 20. The mother is pregnant again, and her doctor tells her she is carrying fraternal twins. What is the probability that both children will NOT have TMU? A. 16/16 B. 1/4 C. 3/4 D. 9/16 E. 1/16 ___ 21. Vermilion eye colour is a sex ­linked recessive characteristic in fruit flies. If a female having vermilion eyes is crossed with a wild ­type male, what percentage of the F1 males will have vermilion eyes? A. B. C. D. E. 75% 25% 0% 50% 100% 4 Practise questions [Ch 6 onwards] 22. Alleles of two linked genes are A. B. C. D. E. most likely both recessive. more usually inherited together than alleles of genes that are not linked. less often inherited together than alleles of genes that are not linked. usually polygenic. most likely both dominant. 23. You are reviewing the karyotype of a child who exhibits the symptoms of Down Syndrome. You see two (2) normal copies of chromosome 21. What is the most likely explanation? A. B. C. D. E. The child is likely monosomic with respect to a sex chromosome. The child likely has a fragment of chromosome 21 material attached to another chromosome. The child likely is missing a small fragment from each copy of chromosome 21. The child likely has a fusion of chromosome 9 and chromosome 22. The child is likely trisomic for an autosome other than chromosome 21. 5 ...
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This note was uploaded on 05/31/2011 for the course BIOL 100 taught by Professor Jackson during the Spring '11 term at York University.

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