Bio Final Longer Questions PDF

1. Phospholipid bilayers _________ form micelles in the aqueous solutions, contain a hydrophilic head and a hydrophobic tail, form bilayers. Answer: form micelles in aqueous solution, contain a hydrophilic head and a hydrophobic tail, form bilayers in cell membrane, (all are correct) 2....

1. Phospholipid bilayers _________ form micelles in the aqueous solutions, contain a hydrophilic head and a hydrophobic tail, form bilayers. Answer: form micelles in aqueous solution, contain a hydrophilic head and a hydrophobic tail, form bilayers in cell membrane, (all are correct) 2. Which of the following are types of trans membrane proteins? Answer: carrier proteins, receptors for hormones or neurotransmitters, channel proteins 3. Activation energy ________. Answer: Determines the speed of a reaction AND can be acquired from the kinetic energy of colliding molecules. 4. If sodium ion is attracted to the inside of a cell ___________. Answer: There must be a net excess of negative charges inside the cell with respect to the outside. 5. 8.) The term simple diffusion can be used to describe _____________. Answer: The movement of OXYGEN molecules across the cell membrane 6. If many solutes are constantly being pumped into or out of cells, why do the intercellular content ratings of these solutes change? Answer: For any give solute, the rate of active transport in one direction is equal to the passive movement (leak) of the solute in the opposite direction. 7. What type of molecule is shown? Answer: (Know what MONISACCHRIDES, DISACCHARIDE, FATTY ACID, PHOSPHOLIPD look like 8. What is the major difference between active transport and passive transport? Answer: active transport requires the addition of energy, passive transport does not 9. A carrier is a transmembrane protein that moves molecules across the membrane through? Answer: Conformational changes in its protein shape. 10. Homeostasis is a term by which describes the process whereby the body? Answer: maintains a constant infernal environment 11. What is the major difference between active transport and passive transport? Answer: active transport requires the addition of energy, passive transport does not 12. A carrier is a transmembrane protein that moves molecules across the membrane through? Answer: Conformational changes in its protein shape. 13. Homeostasis is a term by which describes the process whereby the body? Answer: maintains a constant infernal environment 14. What is the major difference between active transport and passive transport? Answer: active transport requires the addition of energy, passive transport does not 15. A carrier is a transmembrane protein that moves molecules across the membrane through? Answer: Conformational changes in its protein shape. 16. Homeostasis is a term by which describes the process whereby the body? Answer: maintains a constant infernal environment 17. What is the major difference between active transport and passive transport? Answer: active transport requires the addition of energy, passive transport does not 18. A carrier is a transmembrane protein that moves molecules across the membrane through? Answer: Conformational changes in its protein shape. 19. Homeostasis is a term by which describes the process whereby the body? Answer: maintains a constant infernal environment 20. A neutral atom of calcium has two electrons in its outer shell. Which of the following will occur when calcium forms an ion? Answer: calcium will lose 2 electrons to have a full valence shell. 21. Know how to read a DNA sequence. 22. If the na+/k+ pump was turned off, the membrane potential would eventually become equal to the___. Zero mv, no difference between the charge inside compared to outside. 23. Put the phase of the action potential in order. Rapid depolarization, repolarization, after- hyperpolarization 24. Which of the following statements about graded potentials if false. >Graded potentials are limited in duration by the refractory period. 25. An inhibitory postsynaptic potential “ipsp” may___. Move the membrane potential pf the postsynaptic neuron away from threshold. Stabilize the membrane potential of the postsynaptic neuron at the resting potential. 26. Which of the following is a false statement about opening cl- channels and the effect on membrane potential? The electrical gradient moves cl- out. 27. If a resting membrane potential = - 70 mv and the threshold for a neuron = -55mv, an epsp = +8 and an epsp = +9 occurring in quick succession will result in. The generation of the action potentiaL 28. Which statement best describes why the brain requires an uninterrupted supply of blood? The can has limited glycogen to convert to glucose, it does not have access to fatty acids for energy, and it can't produce anergy anaerobically. 29. For ions to move across the capillary endothelial cells of the blood- brain barrier, they must. Be transported across endothelial cells 30. How is the muscle spindle stretch reflex “knee jerk reflex” classified? Spinal, somatic, innate, monosynaptic 31.. What is the temperature range of a cold receptor? 20-35 degrees *c and greater than 45 degrees 32. In which somatosensory pathway does the second order neuron cross to the contralateral side in the medulla Spinothalamic tract 33. During which of the following states are the majority of voltage- gated sodium channels closed and incapable of opening. During the absolute refectory period 34. Regarding ventricular volumes? >Larger the end-diastolic volume, the larger the stroke volume becomes >An increase in the force of ventricular contraction decreased the end- systolic volume 35. The following would produce vasocontraction of the arterioles in an organ? -Stretching of arterioles walls and increased blood-flow 36. A decrease in central venous pressure would decrease? -(All are correct) -Mean Arterial pressure -Cardiac output -Stroke volume 37. A decrease in which of the following would also cause mean arterial pressure to decrease? (All are correct) -Heart rate -Stroke Volume -Total peripheral resistance 38. Which of the following plasma proteins are required for the formation of platelet plug? Von Wille brand facts and Thromboxane 39. Which of the following processes is NOT a part of external respiration? The use of oxygen and generation of carbon dioxide