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MCAT Biology 3

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The bond between two amino acids. Non - rotational because it has partial double - bond characteristics






2. A type of intermediate filament found in epithelial cells






3. Small single - celled organisms that lack a definite nucleus and distinct interior compartments; they are encased within a rigid cell wall. Two main groups are archaebactera and bacteria






4. A network of integrins that connects the actin filaments of one cell with those of neighboring cells or with the extra cellular matrix






5. Laid down when a plant cell is still growing; composed of chitin in fungi and cellulose in plants and protists






6. Components of cytoskeleton






7. Two scientists attempted to reproduce the condition of the (assumed) earth's primitive ocean's under a reducing atmosphere. They produced some of the key molecules to life (amino acids and nucleotides).






8. Organelles found in plants and algae that perform photosynthesis and act as storage units; they all arise from the division of themselves






9. Small single - ringed structures: cytosine found in both DNA and RNA - uracil found in RNA - and thymine found in DNA






10. Biological process in which a some single celled prokaryotes collect intracellular water with a contractile vacuole and then pump it out






11. Anchor epithelial cells to a basement membrane






12. Simple sugars; may be as few as three carbon atoms; those used in energy storage are 6 carbon chains that form rings in solution






13. Most common atoms found in biological molecules






14. A three carbon alcohol in which each carbon is attached to a hydroxyl group






15. Methane - producing archaebacteria - one of the most primitive archaebacteria that are alive today






16. Responsible for cellular movments like contraction - crawling - pinching during division or cytosis - and formation of cellular extensions






17. Mechanically attach the cytoskeleton of a cell to the cytoskeletons of other cells or to the extracellular matrix. Common in tissues experiencing mechanical stress - eg muscle and skin epithelium






18. A special motor protien that moves along the microtubule toward its positive end; in most cells this movement is from the center to the periphery - in the axon it is anterograde transport






19. Glycine - Serine - Threonine - Asparagine - Glutamine






20. A cellular structure that aids in the assembly of microtubules; lacking in cells of plants and fungi






21. Archaebacteria that live in very salty environments - such as the Dead Sea






22. Energy rich molecules that consist only of carbon and hydrogen






23. The bond between two sugar molecules






24. The final folded shape of a globular protein -- positions folds nonpolar side groups within the interior






25. 5- carbon sugar - adenine - and a tri - phosphate group






26. Term for the beta - alpha - beta motif that is found at the core of nuceotide binding sites






27. Function section of a protein that is able to fold independently of the other sections - encoded by exons (functional sections of a gene)






28. Proteins that are anchored in and pass through the plasma membrane; attached to the cytoskeleton on the interior and to the ECM on the exterior






29. Protein found in RBCs that cause their characteristic biconclave shape; connects proteins in the plasma membrane with actin in the cytoskeleton






30. Catalysis (enzymes) - Defense/recognition (immune and hormonal systems) - Transport (eg hemoglobin) - Support (eg collagen) - Motion (actin and myosin) - Regulation (hormones) - Storage (eg bound calcium and iron)






31. Transmembrane proteins that play an important role in cell - cell adhesion; their function is dependent upon calcium; vertebrate migration of neurons is affected by which type of this protein is expressed on the cell's plasma membrane






32. Responsible for moving organelles within a cell - also facilitate cell movement






33. The animal version of starch. An insoluble polysaccharide containing branched amylose chaings. (chain length is much greater than starch and there are more branches)






34. Level of protein structure that is formed by the hydrogen bonds between the polar side groups of the main chain






35. Not soluble in water - the more unsaturated the lower the MP - energy rich (more than twice that of carbohydrates) - animals produce saturated while most plants produce unsaturated






36. The second major group of prokaryotes that have very strong cell walls and are photosynthetic






37. The sugar in RNA contains an extra hydroxyl group and RNA uses uracil instead of thymine






38. Proteins - lipids - carbohydrates - nucleic acids






39. The manner in which all macromolecules are assembled -- water is a product of the reaction






40. Two simple sugars joined together






41. A cluster in the nucleus of ribosomal RNA genes - ribosomal proteins - and the RNAs they produce: it is the site of mass ribosome production






42. A type of anchoring junction that connects the cytoskeletons of adjacent cells






43. Composed of connexons; creates a channel that connects the cytoplasm of two cells






44. The inward movement of one molecule is coupled with the outward movement of another (across the cell membrane)






45. 1 joule = 0.239 calories






46. Adenine and Guanine






47. A modified form of cellulose with a nitrogen group added to the glucose units; structural building material found in arthropods and cell walls of many fungi.






48. The region surrounding a pair of centrioles






49. Nonpolar - polar uncharged - charged - aromatic (nonpolar and polar uncharged) - special function






50. Cholesterol receptors lack tails and cannot be taken up by cells; stays in the bloodstream and coats arteries






Can you answer 50 questions in 15 minutes?



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