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MCAT Biology 2

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 reduced form of NAD+ (nicotinamide adenine dinucleotide). This is the most common electron carrier in cellular respiration.






2. Inactivity resulting from torpidity and lack of vigor or energy






3. A protein present in muscle fibers that aids in contraction and makes up the majority of muscle fiber






4. Assist the enzyme by building the enzyme on a site other than the active site to boost the activivty.






5. The portion of the vertebrate nervous system consisting of the brain and spinal cord






6. After completing meiosis I - these are produced along with a polar body and are released into the fallopian tube.






7. Units in the microscopic structure of mammalian bone. layers of mineralized matrix are deposited around a central canal containing blood vessels and nerves that service the bone






8. Accounts for 2/3 of the weight of bone; formed when calcium phosphate interacts with calcium hydroxide






9. One of the small intracellular globules composed of fats that are mixed cholesterol and coated with special proteins






10. Muscles lying between the ribs that - together with the rib cage - form the sides and top of the thoracic cavity






11. Lines the surface of the lung and follows the contours of the lung itself






12. A spiral shape constituting one form of the secondary structure of proteins - arising from a specific hydrogen - bonding structure.






13. Blood vessel that carries blood away from the kidney and toward the heart






14. Formed from two secondary spermatocytes that undergo meiosis II to produce 4 of them






15. Pertaining to substances that don't contain carbon; a substance that is produced from the breakdown of PC and is the leading cause of fatigue in working muscles






16. Complex proteins or glycoproteins embedded in the membrane with sites that bind to specific molecules in the cells external environment.






17. A mixed nerve that supplies the pharynx and larynx and lungs and heart and esophagus and stomach and most of the abdominal viscera






18. Excited electrons are passed from protein to protein in the thylakoid membrane






19. Concentric rings made up of groups of hollow tubes of bone matrix






20. Molecule binds to an enzyme somewhere other than active site and inhibits. - change the shape of the active site - and may enhance enzyme function






21. The minimum length of time after an action potential during which another action potential cannot begin






22. The period of the cell cycle during which the nucleus is not undergoing division - typically occurring between mitotic or meiotic divisions






23. Blood cells containing hemoglobin that carry oxygen through the bloodstream






24. Movement from a high concentration area to a low concentration area - only works with oily substances - needs to cross oily cell membrane (nonpolar substances) - no energy is required. Movement down concentration gradient






25. Include bacteria and cyanobacteria - are unicellular organisms with simple cell structure. Have an outermembrane but do not contain membrane bound organelles. There is no true nucleus and the genetic material consists of a single circular molecule of






26. A regulatory protein that is a component of the thin filament. When calcium ions (Ca2+) bind to troponin - it undergoes a change in shape; this conformational change moves tropomyosin away from myosin - binding sites on actin molecules - and muscle c






27. Synthesis of lipids - phospholipids and steroid sex hormones - help detoxify drugs and poisons (liver cells) involves adding hydroxyl groups to drugs to make soluble and easier to flush from body. - That portion of the endoplasmic reticulum that is f






28. Mature spermatids that are fully functional and capable of fertilizing a human ovum






29. A neural impulse; a brief electrical charge that travels down an axon. the action potential is generated by the movement of positively charged atoms in and out of channels in the axon's membrane






30. The maximal volume of air that the lungs can contain. Total lung capacity is the sum of the vital capacity and the residual volume - and is typically about 6000 mL (6L).






31. An organism that uses energy to control its internal environment






32. The side by side pairing of homologous maternal and paternal chromosomes at the start of meiosis






33. A fatty acid possessing one or more double bonds between the carbons in the hydrocarbon tail. Such bonding reduces the number of hydrogen atoms attached to the carbon skeleton.






34. A group of bioactive - hormone - like chemicals derived from fatty acids that have a wide variety of biological effects including roles in inflammation - platelet aggregation - vascular smooth muscle dilation and constriction - cell growth - protecti






35. The activated form of the blood - clotting protein fibrinogen - which aggregates into threads that form the fabric of the clot.






36. The part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands






37. When comparing two solutions - the solution with the greater concentration of solutes






38. The passage to the stomach and lungs






39. Voice box; passageway for air moving from pharynx to trachea; contains vocal cords






40. A group of hereditary bleeding disorders in which there is a defect in clotting factors necessary for the coagulation of blood






41. A hemoprotein that receives oxygen from hemoglobin and stores it in the tissues until needed - A globular protein found in muscle tissue that has the ability to bind oxygen. Myoglobin helps to store oxygen in the muscle for use in aerobic respiration






42. One of the two glands in the male reproductive system that add fluid to the semen during ejaculation






43. Drains away fluid so that it does not accumulate in the tissues of our body.






44. The opening of the archenteron in the gastrula that develops into the mouth in protostomes and the anus in deuterostomes






45. Most superficial - 'horn - like' cornified or keratinized - 15-30 layers flat and dead - 15-30 days from stratum basale then 10-14 days until lost - tightly connected






46. Human Chorionic Gonadotropin - a hormone secreted by the trophoblast cells of a blasocyst (i.e. developing embryo) that prolongs the life of the corpus luteum - and thus increases the duration and amount of secreted progesterone. This helps to mainta






47. Carries both electrons and protons (2 at a time)






48. A capsule of several layers of granulosa cells that surrounds the developing secondary oocyte. this remains intact for when the secondary oocyte enters the uterine tubes






49. Non - membrane bound organelles - large - ATP- dependant - a giant protein complex that recognizes and destroys proteins tagged for elimination by the small protein ubiquitin






50. Located between the right atrium and the right ventricle. closes when the right ventricle contracts - allowing blood flow into the lungs and prevent backflow into the right atrium






Can you answer 50 questions in 15 minutes?



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