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






2. The most stable and durable element of cytoskeletal structure; includes vimentin - keratin - and neurofilaments






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






4. Gram positive bacteria have a think - single - layered cell wall that retains the dye used in Gram - staining. Penicillin only works on gram - positive bacteria.






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






6. A carrier protein that simultaneously moves one molecule in as it moves another out






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






8. The bond between the hydroxyl group of one nucleotide and the phosphate group of another.






9. 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






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






11. 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






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






13. 5- carbon sugar - adenine - and a tri - phosphate group






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






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






16. Eukaryotic cell's internal protein scaffold which provides structural support and is extremely important for organizing the cell's activites; a dynamic system that is constantly forming and disassembling






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






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






19. Energy cannot be created or destroyed






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






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






22. 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






23. A short - branched polysaccharide with short - linear amylose branches that are typically 20-30 subunits






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






25. The connection beteween two plasma membranes of plant cells






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






27. The exact sequence of amino acids specified by DNA






28. Proteins - lipids - carbohydrates - nucleic acids






29. Glycerol attached to 3 fatty acids. Also called triglyceride or triacylglycerol






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






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






32. Adenine and Guanine






33. Cytosine - Uracile - Thymine






34. Alanine - Valine - Leucine - Isoleucine






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






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






37. Archaebacteria that live in extermely hot environments - such as hydrothermal vents under the ocean






38. A type of intermediate filament found in epithelial cells






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






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






41. Most common atoms found in biological molecules






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






43. Adenine --- Thymine (DNA) - Adenine --- Uracil (RNA) - Guanine --- Cytosine






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






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






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






47. A structural starch that is a string of beta glucose molecules; it is the chief structural component of plant cell walls. Starch - degrading enzymes that occur in most organisms cannot break the bond between two beta - glucose molecules.






48. A hydrocarbon chain that terminates with a carboxyl group.






49. Phenyalanine - Tryptophan - Tyrosine






50. The region surrounding a pair of centrioles






Can you answer 50 questions in 15 minutes?



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