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Department
Psychology
Course
PS263
Professor
Paul Mallet
Semester
Summer

Description
C HAPTER 5 THE RESEARCH M ETHODS OF B IOPSYCHOLOGY : U NDERSTANDING W HAT BIOPSYCHOLOGISTS D O M ULTIPLEC HOICE QUESTIONS 1) Vestibular function can be assessed by assessing a patient's reaction to A) facial nerve stimulation. D) needles inserted in the face. B) electroencephalography. E) needles inserted in the foot. C) cold water flushed in the ear. Answer: C Diff: 2 Page Ref: 102 Topic: Chapter 5 Introduction 2) The ironic case of Professor P. makes the point that A) two brains are better than one. B) Alzheimer's disease can have an early onset. C) many research methods of biopsychology are used in clinical settings. D) brain tumors can be bilateral. E) cortical tumors are usually malignant. Answer: C Diff: 3 Page Ref: 102 Topic: Chapter 5 Introduction 3) Which contrast X-ray technique is designed to locate vascular abnormalities in the brains of human patients? A) cerebral angiography D) CT scans B) X-ray photography E) PET scans C) pneumoencephalography Answer: A Diff: 1 Page Ref: 103 Topic: 5.1 Methods of Visualizing the Living Human Brain 4) Which of the following is a contrast X-ray technique? A) angiography D) structural magnetic resonance imaging B) magnetoencephalography E) functional MRI C) positron emission tomography Answer: A Diff: 2 Page Ref: 103 Topic: 5.1 Methods of Visualizing the Living Human Brain 5) A computed tomography (CT) scan of the brain is usually presented as a series of eight or nine A) horizontal sections. D) sagittal sections. B) frontal sections. E) midsagittal sections. C) coronal sections. Answer: A Diff: 3 Page Ref: 103 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain Copyright © 2011 Pearson Education, Inc. All rights reserved. 101 Test Bank for Biopsychology, 8/e 6) Which technique is illustrated here? A) computed tomography B) cerebral angiography C) electroencephalography D) magnetic resonance imaging E) positron emission tomography Answer: A Diff: 3 Page Ref: 103 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 7) Which of the following procedures is not an adaptation of X-ray photography? A) computed tomography D) angiography B) MRI E) both A and C C) CT Answer: B Diff: 2 Page Ref: 104 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 8) Which of the following provides the most detailed three-dimensional view of the structure of the living human brain? A) CT D) EEG B) PET E) MRI C) angiography Answer: E Diff: 2 Page Ref: 104 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 9) Positron emission tomography is a valuable research tool because it A) pictures the brain in fine detail. D) provides an image of brain structure. B) involves angiography. E) involves low levels of radioactivity. C) provides an image of brain function. Answer: C Diff: 3 Page Ref: 104 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 10) A patient is sometimes injected with radioactive 2-deoxyglucose before A) a CT scan. D) positron emission tomography. B) magnetic resonance imaging. E) a sodium amytal test. C) a contrast X-ray. Answer: D Diff: 2 Page Ref: 104 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 102 Chapter 5: The Research Methods of Biopsychology 11) The reason why radioactive 2-DG is useful for revealing the level of activity of neurons in different parts of the brain is that 2-DG A) is absorbed by neurons in relation to their level of activity. B) is metabolized by neurons in relation to their level of activity. C) is not metabolized by neurons. D) both A and C E) both A and B Answer: D Diff: 3 Page Ref: 104 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 12) Functional MRI generates images of increases to areas of the brain of A) oxygenated blood flow. D) alpha waves. B) water flow. E) 2-DG. C) nitric oxide flow. Answer: A Diff: 2 Page Ref: 105 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 13) Which technique records the BOLD signal? A) MRI D) PET B) CT E) MEG C) fMRI Answer: C Diff: 2 Page Ref: 105 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 14) Functional MRI requires the injection of radioactive A) water. D) oxygen. B) glucose. E) none of the above C) 2-DG. Answer: E Diff: 3 Page Ref: 105 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 15) Which method provides structural and functional information about the living human brain on the same image? A) functional MRI D) CT B) angiography E) EEG C) PET Answer: A Diff: 2 Page Ref: 106 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 16) Which of the following technique measures changes in magnetic fields on the surface of the brain? A) MRI D) EMG B) fMRI E) EEG C) MEG Answer: C Diff: 2 Page Ref: 106 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 103 Test Bank for Biopsychology, 8/e 17) Which of the following is a method used by cognitive neuroscientists to turn off part of the brain while the effects on cognition and behavior are assessed? A) 2-DG. D) PET. B) ERP. E) EEG. C) TMS. Answer: C Diff: 1 Page Ref: 107 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 18) Unlike brain-imaging techniques, TMS permits the study of __________ between human cortical activity and cognition. A) links D) neural connections B) causal relations E) communication C) correlations Answer: B Diff: 1 Page Ref: 107 Topic: 5.1 Methods of Visualizing and Stimulating the Living Human Brain 19) An electroencephalograph is A) a gross measure of the electrical activity of the brain. B) a gross measure of the electrical activity of the cortex. C) a gross measure of the electrical activity of neurons. D) a gross measure of the electrical activity of groups of neurons. E) an EEG machine. Answer: E Diff: 3 Page Ref: 107 Topic: 5.2 Recording Human Psychophysiological Activity 20) In human patients, EEG activity is commonly recorded directly from A) muscle. D) the neocortex. B) the hippocampus. E) the heart. C) the scalp. Answer: C Diff: 1 Page Ref: 107 Topic: 5.2 Recording Human Psychophysiological Activity 21) Alpha wave EEG activity is associated with A) high arousal. D) epilepsy. B) sleep. E) evoked potentials. C) relaxed wakefulness. Answer: C Diff: 2 Page Ref: 107 Topic: 5.2 Recording Human Psychophysiological Activity Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 104 Chapter 5: The Research Methods of Biopsychology 22) Which of the following biopsychologists would be most likely to study cortical ERPs in human volunteers? A) a neuropsychologist D) a psychopharmacologist B) a psychophysiologist E) a comparative psychologist C) a physiological psychologist Answer: B Diff: 2 Page Ref: 108 Topic: 5.2 Recording Human Psychophysiological Activity 23) Signal averaging is commonly used in the recording of ERPs because it reduces the magnitude of A) large signals. D) the P300. B) sensory evoked potentials. E) far-field potentials. C) random signals. Answer: C Diff: 3 Page Ref: 108 Topic: 5.2 Recording Human Psychophysiological Activity 24) The main difference between an average evoked potential (AEP) and a "raw" evoked potential is that A) an AEP is usually unobservable. B) an AEP is an alpha wave. C) a raw evoked potential is often unobservable amidst the random noise of the ongoing EEG signal. D) an AEP is a unit response. E) a raw evoked potential is likely to be larger. Answer: C Diff: 3 Page Ref: 108 Topic: 5.2 Recording Human Psychophysiological Activity 25) The P300 A) is an EEG wave that often occurs after the presentation of a momentary stimulus meaningful to the subject. B) is a negative EEG wave. C) is a far-field potential occurring 300 mm from the electrode. D) occurs about 300 seconds prior to a response. E) is a component of the potential evoked by a meaningless click. Answer: A Diff: 2 Page Ref: 108 Topic: 5.2 Recording Human Psychophysiological Activity 26) The signals in the first few milliseconds of the average auditory evoked potential A) always originate next to the scalp electrode. B) are far-field potentials. C) originate in the sensory nuclei of the brain stem. D) all of the above E) both B and C Answer: E Diff: 3 Page Ref: 109 Topic: 5.2 Recording Human Psychophysiological Activity Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 105 Test Bank for Biopsychology, 8/e 27) Components of AEPs recorded in the first few milliseconds after a stimulus are A) almost always auditory. B) almost always visual. C) not usually influenced by the meaning of the stimulus. D) of special interest to cognitive psychologists. E) almost always influenced by the meaning of the stimulus. Answer: C Diff: 3 Page Ref: 109 Topic: 5.2 Recording Human Psychophysiological Activity 28) The short-latency low-amplitude signals (indicated by the arrow) in this average auditory evoked potential are termed A) the P300. B) the P400. C) the ERP. D) the sensory evoked potential. E) far-field potentials. Answer: E Diff: 2 Page Ref: 109 Topic: 5.2 Recording Human Psychophysiological Activity 29) Modern computer techniques have made it possible to estimate the A) time of particular EEG signals. C) frequency of particular EEG signals. B) location of the source of particular EEG D) latency of far-field potentials. signals. E) P300. Answer: B Diff: 2 Page Ref: 109 Topic: 5.2 Recording Human Psychophysiological Activity 30) Muscle tension is monitored by A) electroencephalography. D) ERPs. B) electromyography. E) MEGs. C) electrooculography. Answer: B Diff: 1 Page Ref: 109 Topic: 5.2 Recording Human Psychophysiological Activity 31) Electrooculography is A) usually performed with one electrode mounted on each cornea. B) a method of estimating eye movement from eye muscle activity. C) a method of measuring skin conductance. D) an indirect method of measuring pupil constriction. E) both A and B Answer: B Diff: 2 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 106 Chapter 5: The Research Methods of Biopsychology 32) Electrooculography is a technique for monitoring A) penile engorgement. D) eye movement. B) cortical activity. E) muscle tension. C) blood pressure. Answer: D Diff: 1 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 33) In electrooculography, how many electrodes are typically used to monitor the movements of one eye? A) 4 D) 1 B) 8 E) 6 C) 2 Answer: A Diff: 1 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 34) Illustrated here is A) electroencephalography. B) magnetoencephalography. C) electrooculography. D) plethysmography. E) electromyography. Answer: C Diff: 1 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 35) If you were startled by a loud noise, there would be an increase in your skin's conductance of electricity. This response is called A) a skin conductance response. D) an average evoked potential. B) an EKG. E) a P300 wave. C) a skin conductance level. Answer: A Diff: 1 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 36) Which gland or glands directly influence the SCL and the SCR? A) gonads D) pancreas B) pituitary gland E) thymus gland C) sweat glands Answer: C Diff: 1 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 107 Test Bank for Biopsychology, 8/e 37) Which of the following is a record of a person's heart beat? A) electrocardiogram D) all of the above B) ECG E) both A and B C) EKG Answer: D Diff: 2 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 38) Hypertension is A) stress. D) chronic low blood pressure. B) caused by excitement. E) a sphygmomanometer. C) chronic high blood pressure. Answer: C Diff: 1 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 39) The level of 130/70 mmHg is A) indicative of stress. . B) the ratio of diastolic to total systolic blood D) a healthy human blood pressure. pressure. E) both A and C C) indicative of hypertension Answer: D Diff: 3 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 40) Which of the following have traditionally been used by physicians to measure blood pressure? A) sphygmomanometers D) electrodes B) plethysmographs E) ERPs C) oscilloscopes Answer: A Diff: 2 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 41) Penile erection is A) a muscular response. D) a sphygmomanometric response. B) an electromyographic response. E) an aberrant response. C) a plethysmographic response. Answer: C Diff: 3 Page Ref: 110 Topic: 5.2 Recording Human Psychophysiological Activity 42) Stereotaxic surgery typically requires A) a stereotaxic atlas. D) an electrode holder. B) a stereotaxic instrument. E) all of the above C) a head holder. Answer: E Diff: 1 Page Ref: 111 Topic: 5.3 Invasive Physiological Research Methods Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 108 Chapter 5: The Research Methods of Biopsychology 43) The method by which the experimental devices are accurately positioned in subcortical structures is A) autoradiography. D) stereotaxic surgery. B) cryogenesis. E) aspiration. C) perfusion. Answer: D Diff: 1 Page Ref: 111 Topic: 5.3 Invasive Physiological Research Methods 44) Bregma is A) the point of intersection between two major skull sutures. B) a common reference point for rat stereotaxic brain surgery. C) a naughty word. D) a type of electrode holder. E) both A and B Answer: E Diff: 1 Page Ref: 111 Topic: 5.3 Invasive Physiological Research Methods 45) The reference point for many stereotaxic atlases of the rat brain is A) smegma. D) bregma. B) lambda. E) both C and D C) the intersection between two major fissures. Answer: D Diff: 1 Page Ref: 111 Topic: 5.3 Invasive Physiological Research Methods 46) Unlike subcortical lesions, cortical lesions are often made by A) the electrolytic method. D) transection. B) aspiration. E) stereotaxic surgery. C) radio-frequency current. Answer: B Diff: 1 Page Ref: 111 Topic: 5.3 Invasive Physiological Research Methods 47) Which of the following brain lesion techniques is least likely to be associated with the destruction of major blood vessels? A) aspiration lesions D) knife cuts B) electrolytic lesions E) lobotomy C) radio-frequency lesions Answer: A Diff: 3 Page Ref: 112 Topic: 5.3 Invasive Physiological Research Methods 48) The __________ created by the current is the main cause of tissue damage produced be a radio- frequency lesion. A) vibration D) ion deposits B) current induction E) acid C) heat Answer: C Diff: 2 Page Ref: 112 Topic: 5.3 Invasive Physiological Research Methods Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 109 Test Bank for Biopsychology, 8/e 49) Cryogenic blockade, if properly done, A) destroys only those neurons that have been cooled. B) produces a discrete area of permanent damage. C) destroys neurons by freezing them. D) produces little or no permanent neural damage. E) eliminates all neural activity in the brain. Answer: D Diff: 1 Page Ref: 112 Topic: 5.3 Invasive Physiological Research Methods 50) Cryogenic blockade is often referred to as a functional or reversible lesion because A) the damage that it produces lasts only a few weeks. B) the damage that it produces lasts only a day or two. C) it temporarily eliminates the contribution of a particular area of the brain without damaging the brain. D) it produces lesions that can be reversed with drugs. E) the subjects always survive. Answer: C Diff: 2 Page Ref: 112 Topic: 5.3 Invasive Physiological Research Methods 51) A temporary or reversible lesion can be produced by A) excision or cutting. D) radio-frequency current. B) aspiration or suction. E) invasive EEG. C) cryogenic blockade. Answer: C Diff: 1 Page Ref: 112 Topic: 5.3 Invasive Physiological Research Methods 52) Reversible lesions can be produced by microinjection directly into the target brain structure of A) a local anesthetic. D) all of the above B) lidocaine. E) both A and B C) a coolant. Answer: E Diff: 3 Page Ref: 112 Topic: 5.3 Invasive Physiological Research Methods 53) Lesions that are commonly referred to as amygdala lesions often A) damage neural structures other than the amygdala. B) do not destroy the entire amygdala. C) damage prefrontal cortex. D) both A and B E) both B and C Answer: D Diff: 3 Page Ref: 112 Topic: 5.3 Invasive Physiological Research Methods Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 110 Chapter 5: The Research Methods of Biopsychology 54) Lesions restricted to structures on one half of the brain are called A) unilateral lesions. D) bipolar lesions. B) bilateral lesions. E) unitary lesions. C) monopolar lesions. Answer: A Diff: 1 Page Ref: 113 Topic: 5.3 Invasive Physiological Research Methods 55) Lesions restricted to structures in one half of the brain usually have effects that are much less severe than comparable A) unilateral lesions. D) aspiration lesions. B) bipolar lesions. E) bilateral lesions. C) cryogenic lesions. Answer: E Diff: 1 Page Ref: 113 Topic: 5.3 Invasive Physiological Research Methods 56) Intracellular unit recording is not commonly used in biopsychological research because A) it is too difficult for biopsychologists. B) biopsychologists are usually not interested in neurons. C) it is a neurophysiological procedure. D) it is very difficult to keep the tip of a microelectrode inside a single neuron in a moving subject. E) all of the above Answer: D Diff: 1 Page Ref: 113 Topic: 5.3 Invasive Physiological Research Methods 57) Intracellular unit recording is very difficult in A) humans. D) freely moving animals. B) monkeys. E) higher species. C) rats. Answer: D Diff: 1 Page Ref: 113 Topic: 5.3 Invasive Physiological Research Methods 58) Which method was used to record this signal? A) extracellular unit recording B) intracellular unit recording C) electroencephalography D) integrated multiple-unit recording E) plethysmography Answer: B Diff: 2 Page Ref: 113 Topic: 5.3 Invasive Physiological Research Methods Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 111 Test Bank for Biopsychology, 8/e 59) Unlike other electrophysiological methods of recording neural activity, intracellular unit recording provides measurements of A) cell firing. D) reductions in neural firing. B) action potentials. E) EEG activity. C) the membrane potential. Answer: C Diff: 3 Page Ref: 113 Topic: 5.3 Invasive Physiological Research Methods 60) Extracellular unit recording provides information about A) the magnitude of the membrane potential. D) all of the above B) the wave form of action potentials. E) none of the above C) EPSPs. Answer: E Diff: 3 Page Ref: 113 Topic: 5.3 Invasive Physiological Research Methods 61) Which method was used to record this signal? A) extracellular unit recording B) intracellular unit recording C) electroencephalography D) integrated multiple unit recording E) plethysmography Answer: A Diff: 2 Page Ref: 113 Topic: 5.3 Invasive Physiological Research Methods 62) Multiple-unit signals are typically A) recorded through microelectrodes. B) recorded through electrodes that are larger than microelectrodes. C) integrated to facilitate their interpretation. D) both A and C E) both B and C Answer: E Diff: 3 Page Ref: 114 Topic: 5.3 Invasive Physiological Research Methods 63) In laboratory animals, cortical EEG signals are commonly recorded through A) stainless steel skull screws. D) disk electrodes taped to the scalp. B) electrodes placed around the eyes. E) cortical pipettes. C) subcortical electrodes. Answer: A Diff: 1 Page Ref: 114 Topic: 5.3 Invasive Physiological Research Methods Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 112 Chapter 5: The Research Methods of Biopsychology 64) IP, SC, and IM are all A) recording methods. D) cranial nerves. B) drugs. E) routes of drug administration. C) stimulation methods. Answer: E Diff: 2 Page Ref: 115 Topic: 5.4 Pharmacological Research Methods 65) Drugs that don't penetrate the blood brain barrier can be administered to brain tissue A) by SC injection. B) through a stereotaxically positioned cerebral cannula. C) through an intracerebral microelectrode. D) by IV injection. E) by injection into a carotid artery. Answer: B Diff: 2 Page Ref: 115 Topic: 5.4 Pharmacological Research Methods 66) Both ibotenic acid and kainic acid A) are neurotoxins. B) destroy neurons whose cell bodies are at the tip of an intracerebral cannula, while leaving axons passing through the region undamaged. C) are selective dopamine agonists. D) are selective dopamine antagonists. E) both A and B Answer: E Diff: 2 Page Ref: 115 Topic: 5.4 Pharmacological Research Methods 67) The neurotoxin, 6-hydroxydopamine (6-OHDA) selectively destroys A) neurons that release dopamine or norepinephrine. B) axons. C) cell bodies. D) multipolar neurons. E) the hypothalamus. Answer: A Diff: 2 Page Ref: 115 Topic: 5.4 Pharmacological Research Methods 68) A method of identifying all of the brain areas of a laboratory animal that were particularly active during a behavioral test is A) cerebral dialysis. D) the 6-OHDA technique. B) the 2-deoxyglucose technique. E) the kainic acid technique. C) immunocytochemistry. Answer: B Diff: 2 Page Ref: 115 Topic: 5.4 Pharmacological Research Methods Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 113 Test Bank for Biopsychology, 8/e 69) The final stage of the 2-deoxyglucose technique involves A) autoradiography. D) immunocytochemistry. B) injecting 2-DG. E) cerebral dialysis. C) injecting radioactive 2-DG. Answer: A Diff: 3 Page Ref: 115 Topic: 5.4 Pharmacological Research Methods 70) A method of measuring the levels of neurochemicals in particular sites in the brains of active laboratory animals is A) cerebral dialysis. D) immunocytochemistry. B) the 6-OHDA histological technique. E) electroencephalography. C) in situ hybridization. Answer: A Diff: 2 Page Ref: 115 Topic: 5.4 Pharmacological Research Methods 71) Cerebral dialysis is a method of A) stimulating the brain. B) stimulating the neuroendocrine system. C) measuring changes in the extracellular concentrations of various neurochemicals at particular sites in the brains of active animals. D) 6-OHDA. E) recording AEPs. Answer: C Diff: 1 Page Ref: 115 Topic: 5.4 Pharmacological Research Methods 72) Which of the following is a technique for locating particular proteins in the brain? A) immunocytochemistry. D) both A and B B) the 6-OHDA technique. E) both A and C C) in situ hybridization. Answer: E Diff: 3 Page Ref: 116 Topic: 5.4 Pharmacological Research Methods 73) Which of the following procedures employs labeled antibodies? A) immunocytochemistry D) electroencephalography B) in situ hybridization E) both A and B C) cerebral dialysis Answer: A Diff: 2 Page Ref: 116 Topic: 5.4 Pharmacological Research Methods 74) In immunocytochemistry, the labeled ligand is A) an amino acid. D) a neurotransmitter. B) a microelectrode. E) a receptor. C) an antibody. Answer: C Diff: 2 Page Ref: 116 Topic: 5.4 Pharmacological Research Methods Copyright © 2011 Pearson Education, Inc. All Rights Reserved. 114 Chapter 5: The Research Methods of Biopsychology 75) Immunocytochemistry is to in situ hybridization as A) antibody is to messenger RNA. D) antibody is to DNA. B) DNA is to antibody. E) RNA is to antibody. C) neurotransmitter is to cell body. Answer: A Diff: 3 Page Ref: 116 Topic: 5.4 Pharmacological Research Methods 76) Knockout mice are mice that A) have had a concussion. D) both A and C B) are susceptible to concussion. E) none of the above C) have amnesia. Answer: E Diff: 1 Page Ref: 117 Topic: 5.5 Genetic Engineering 77) Which of the following is a weakness of the gene knockout technique as a method of biopsychological research? A) Most behavioral traits are influenced by many interacting genes. B) Elimination of one gene often influences the expression of other genes. C) The effects of some gene knockouts are likely to depend on experience. D) all of the above E) none of the above Answer: D Diff: 2 Page Ref: 117 Topic: 5.5 Genetic Engineering 78) Melanopsin knockout mice have difficulty A) adjusting their circadian rhythms in response to changes in the daily light-dark cycle. B) seeing. C) sleeping on a regular schedule. D) displaying circadian rhythms. E) recognizing circadian signals. Answer: A Diff: 2 Page Ref: 117 Topic: 5.5 Genetic Engineering 79) Transgenic mice always possess A) more genes than normal. D) fewer chromosomes than normal. B) fewer genes than normal.
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