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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. Proteins with short chains of sugars attached to them; in eukaryotic cells they are important membrane proteins that allow cell - cell recognition and interaction






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






3. Phenyalanine - Tryptophan - Tyrosine






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






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






6. The unfolding of a protein caused by a shift in pH - ion concentration - or temperature.






7. Energy cannot be created or destroyed






8. Glycoproteins that forms a complex web that forms a protective layer of the surface of animal cells






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






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






11. Manner in which macromolecules are broken down -- water is separated into H and OH






12. Adenine and Guanine






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






14. Protein that plays a major role in vesicle formation during receptor mediated endocytosis; forms a coated pit on the plasma membrane






15. Insoluble polysaccharides made by plants that are formed stricly from glucose (alpha form).






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






17. 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.






18. 5 carbon sugar (ribose or deoxyribose) bound to a phosphate and a nitrogenous base






19. Long - threadlike structures protruding from the surface of a cell that are used for locomotion






20. Ancient prokaryotes that survive in extreme anaerobic conditions - such as deap sea vents; they lack peptidoglycan in their cell walls






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






22. 5- carbon sugar - adenine - and a tri - phosphate group






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






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






25. Large - membrane bound sac in plant cells that stores proteins - pigments - and waste material






26. Large (relative to pyrimidines) double ringed molecules that are found in both DNA and RNA






27. A group of about 20 lipids that are modified fatty acids - 5- carbon ring w/ 2 nonpolar tails.






28. A structure that some fully expanded plant cells produce; provides very strong structural support






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






30. A glucose ring formed with the hydroxyl group in the opposite plane of the methanol group






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






32. Most abundant protein found in vertebrate body; forms matrix of skin - ligaments - tendons - and bones; found in the ECM






33. Two simple sugars joined together






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






35. Glycoprotein that attaches the ECM to the plasma membrane






36. A form of endocytosis where an animal cell engulfs liquid matter






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






38. 1. All organisms are composed of one or more cells 2. Cells are the smallest living things - the basic units of organization of all organmisms 3. Cells arise only by division of a previously existing cell






39. 1 joule = 0.239 calories






40. Cysteine - Methionine - Proline






41. A sticky substance that acts as a glue between the primary cell walls of plant cells






42. A glucose ring formed with the hydroxyl group in the same plane as the methanol group






43. Simplest starch which is a long unbranching chain of glucose molecules






44. Proteins that help another protein fold properly; elevated levels of this protein are found when the cell is exposed to elevated temperatures






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






46. 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






47. They connect the plasma membranes of adjacent cells in a sheet - preventing molecules from leaking between the cells.






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






49. The bond between two sugar molecules






50. Glycerol attached to a phosphate group and two fatty acid chains