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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. Where myosin heads can attach. 2 proteins usualy cover the locations of attachments for the myosin heads: troponin and tropomyosin.






2. Blood vessels that carry blood back to the heart






3. This poison that can carru protons across inner membrane; uncouples the electron transport chain from the proton gradient established across the inner mitochondrial membrane.






4. Form gametes which combine to form zygotes that develope into more sporozoites






5. Used to create ATP. H+ in the thylakoid space can only diffuse down it gradient through an enzyme called ATPsynthase. ATPsynthase consists of two parts. One is a proton channel that allows the H+ to diffuse into the stroma. The other part couples thi






6. Abnormally low blood sugar usually resulting from excessive insulin or a poor diet






7. An enzyme complex in the inner membrane of a mitochondrion and the thylakoid membrane of a chloroplast that catalyzes the formation of ATP.






8. 1) is the 2nd and deepest layer of the dermis. 2) Compose of Dense Irregular CT. 3) Contains interlacing Collagen and Elastic Fibers. 4) Is packed with oil glands - sweat gland ducts - fat - and hair follicles. 5) It provides strength - extensibility






9. Body cell; no egg or sperm






10. Tissue consisting of long muscle cells that are capable of contracting when stimulated by nerve impulses. Three types skeletal - cardiac - and smooth.






11. Activated in the duodenum by enterokinase - which is produced in the cells lining the duodenum






12. Minerals that carry electrical charges that help maintain the body's fluid balance






13. Process by which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell






14. First and longest phase of mitosis - during which the chromosomes become visible and the centrioles separate and take up positions on the opposite sides of the nucleus






15. Two components: organinc which is collagen fibers and inorganic which is hydroxyapatite crystals






16. (Vh and Vl) variable N- terminal portions of the L and H chains that cause the differences between antibodies and combine to make up the antigen - binding region of the antibody.






17. Cortisol and Cortisone are types of these hormones - produced in the Adrenal cortex - which increase blood glucose levels through stimulation of gluconeogenesis and the decrease of protein synthesis. They also reduce the body's immunological and infl






18. Reproduction that consists of only females that produce more females from unfertilized eggs






19. The thin endometrium layer of the uterus that does not shed and is responsible for forming a new functional layer after menstruation ends






20. The contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery






21. Small nuclear ribonucleoproteins; recognize the splice sites in the pre - mRNA; located in the nucleus and are composed of proteins and RNA






22. Stimulates and sustains a woman's milk production following the birth of an infant






23. Enzyme in the intestinal juice that converts inactive trypsinogen into active trypsin






24. Duct formed by the union of the vas deferens with the duct of the seminal vesicle; its fluid is carried into the urethra






25. Aid in expiration by contracting to pull the ribs downward and decrease the volume of the thoracic cavity (internal intercostal muscles originate in the inferior rib and insert on the superior rib)






26. A solution in which the concentration of solutes is greater than that of the cell that resides in the solution






27. Presence of an abnormal amount of ketone bodies in the blood and urine indicating an abnormal utilization of carbohydrates as seen in uncontrolled diabetes and starvation






28. Consists of layer of compact bone encloses in spongy bone at the ends of the long bones






29. Stage of the cell cycle when a cell is actively dividing - the part of the cell cycle when mitosis divides the nucleus and distributes its chromosomes to the daughter nuclei and cytokinesis divides the cytoplasm - producing two daughter cells.






30. Thin - walled microscopic air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place






31. A fluid - filled sphere formed about 5 days after fertilization of an ovum that is made up of an outer ring of cells and inner cell mass. THis is the structure that implants in the endometrium of the uterus.






32. Joint that allows range of movement






33. Require B and T cells. B cells undergo clonal selection with production of plasma cells and memory B cells after their B- cell receptor combines with a specific antegen. Plasma cells secrete antibodies and eventually undergo apoptosis. Memory B cells






34. The coupling of the 'downhill' diffusion of one substance to the 'uphill' transport of another against its own concentration gradient






35. Organelles that serve as specialized containers for metabolic reactions.






36. Area of prokaryotic cells where the DNA is concentrated.






37. Corticotropin releasing factor; secreted by hypothalamus and stimulates the pituitary gland and activated adrenal gland and then get the release of corisol as part of the 'stress response'






38. The production - growth - and maturation of an egg - or ovum






39. Glands located in the walls of the stomach - secreting the hormone gastrin in response to certain substances in food.






40. A vein connecting the capillary bed of the intestines with the capillary bed of the liver. This allows amino acids and gluocse absorbed from the intestines to be delivered first to the liver for processing before being transported throughout the circ






41. Neuroepithelial edges of the neural groove - the apical edges of which meet in the midline to close the neural tube






42. Measurement of amount of blood ejected from a ventricle in one contraction






43. The model of the enzyme that shows the substrate binding to the active site and the active site altering slightly is the






44. The removal of an amino group from an organism - particularly from an amino acid






45. Generation of glucose from non - sugar carbon substrates like pyruvate - lactate - glycerol - and amino acids The vast majority takes place in the liver and - to a smaller extent - in the cortex of kidney. This process occurs during periods of fastin






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






47. An amino acid in a polypeptide that is not the N or C terminal AA. This refers to every amino acid in a polypeptide chain.






48. Tiny passageways interconnecting the lacunae/osteocytes with the blood vessels - nerves - etc. in the Haversain Canal of an Haversian System






49. Any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes - thus producing an immune response






50. The transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins.