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Test sobre W5 Questions, creado por Madi Egan el 12/10/2018.

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W5 Questions

Pregunta 1 de 34

1

Protein degradation
What degrades damaged mitochondria?

Selecciona una de las siguientes respuestas posibles:

  • Macroautophagy

  • Caspases

  • Chaperon-mediated autophagy

  • 26S proteasomes

Explicación

Pregunta 2 de 34

1

Protein degradation (Wojcik)
What is the difference between lysosomes and proteasomes?

Selecciona una de las siguientes respuestas posibles:

  • In contrast to proteasomes, lysosomal enzymes operate at alkaline pH.

  • In contrast to lysosomes, proteasomes are not surrounded by a membrane.

  • In contrast to proteasomes, lysosomes do not degrade cytoplasmic proteins.

  • In contrast to lysosomal enzymes, proteasomes have only one catalytic activity.

Explicación

Pregunta 3 de 34

1

Protein degradation (Wojcik)
Proteasome inhibitors are currently used for the treatment of which of the following conditions?

Selecciona una de las siguientes respuestas posibles:

  • Malaria

  • Asthma

  • Multiple myeloma

  • Ulcerative colitis

Explicación

Pregunta 4 de 34

1

Anatomy (Nelsen)
A 28-year-old man presents with chest pain and breathlessness resulting from formation and rupture of a lung bleb (a weakening in
the alveolar wall resulting in an out-pocketing and eventual rupture into the pleural space). In addition to the breakdown of the epithelial wall of the alveoli, what is the final membrane that must be breached in order to allow air to escape from the lung into the pleural cavity?

Selecciona una de las siguientes respuestas posibles:

  • Endothoracic fascia

  • Parietal pleura

  • Visceral pleura

  • Pulmonary ligament

Explicación

Pregunta 5 de 34

1

Nelson-Anatomy: cardiovascular
A 45-year-old woman is admitted to the hospital with edema of the lower extremities. Ultrasound imaging reveals an incompetent bicuspid valve. Into which area will regurgitation (i.e., backwards flow) of blood occur in this patient?

Selecciona una de las siguientes respuestas posibles:

  • Ascending aorta

  • Left atrium

  • Pulmonary trunk

  • Right ventricle

Explicación

Pregunta 6 de 34

1

Histology (Wojcik)
Volkmann's (aka perforating) canals allow direct connections between what structures?

Selecciona una de las siguientes respuestas posibles:

  • Two osteocytes

  • Blood vessels in adjacent osteons

  • Blood vessels outside a bone and inside an osteon

  • Blood vessels outside a bone and inside the marrow cavity

Explicación

Pregunta 7 de 34

1

Histology (Wojcik)
By what route do nutrients and oxygen reach chondrocytes in hyaline cartilage?

Selecciona una de las siguientes respuestas posibles:

  • Diffusion from endochondral capillaries

  • Diffusion from the perichondrium

  • Passage through canaliculi

  • Passage through gap junctions

Explicación

Pregunta 8 de 34

1

Johnstone-Extracellular Matrix
What is the importance of the non-covalent aggregation of aggrecan (The major proteoglycan of articular cartilage) along hyalurononan chains?

Selecciona una de las siguientes respuestas posibles:

  • Aggregates provide tensile strength to connective tissues.

  • Aggregation causes the hyaluronan to unfold and form microfibrils.

  • It allows outside-in signaling to occur at the cell surface.

  • It holds aggrecan in tissues, providing a high net negative charge.

Explicación

Pregunta 9 de 34

1

Johnstone-Extracellular Matrix
Collagen type I is the major collagen of the human body. Which of the following is a collagen type I rich tissue?

Selecciona una de las siguientes respuestas posibles:

  • Articular cartilage

  • Basal lamina

  • Skin

  • Zona apparatus of the eye

Explicación

Pregunta 10 de 34

1

Epi Diagnostic (Gorman)
In clinical skills lab you learn to rate the loudness of heart murmurs according to a standard scale as follows: This data represents which type of variable?

Selecciona una de las siguientes respuestas posibles:

  • Continuous

  • Nominal

  • Ordinal

  • Interval

Explicación

Pregunta 11 de 34

1

Epi Diagnostic (Gorman)
A patient you are seeing in clinic has blood pressures recorded by her doctor at each of the last 6 visits. During the same period, the patient had her blood pressure checked by firefighters at the neighborhood fire station. Blood pressure values are shown in the table: You note an overall difference between the blood pressure values taken at the doctor's office to those obtained at the fire station, and attribute the difference to which of the following?:

Selecciona una de las siguientes respuestas posibles:

  • Measurement bias

  • Selection bias

  • Reliability

  • Chance

Explicación

Pregunta 12 de 34

1

Gene Expression (Spellman)
Histones alter gene expression by which of the following processes?

Selecciona una de las siguientes respuestas posibles:

  • Condensing DNA and methylating DNA

  • Condensing DNA

  • Methylating DNA

  • Interacting with transcription factors that contain bromodomains and chromodomains

Explicación

Pregunta 13 de 34

1

Gene Expression (Spellman)
Mammalian mRNAs are primarily transcribed by which of the following?

Selecciona una de las siguientes respuestas posibles:

  • RNA Polymerase III and then spliced by the spliceosome and capped

  • RNA Polymerase II, which recruits splicing and capping enzymes

  • RNA Polymerase I and then translated by the ribosome

  • RNA Polymerase's CTD

Explicación

Pregunta 14 de 34

1

Gene Expression (Spellman)
Epigenetic regulation allows information to be passed from which of the following?:

Selecciona una de las siguientes respuestas posibles:

  • Cells to their daughters

  • One cell to nearby cells

  • Viruses to cells that they infect

  • Many nearby cells to a target cell

Explicación

Pregunta 15 de 34

1

Gene Expression (Spellman)
The Central Dogma of Molecular Biology is which of the following?

Selecciona una de las siguientes respuestas posibles:

  • DNA encodes genes that make protein

  • RNA is translated into protein

  • DNA is used to make RNA, which is used to make protein

  • DNA encodes genes, RNA encodes proteins

Explicación

Pregunta 16 de 34

1

Marfan (Sakai)
In the absence of a family history of Marfan syndrome, diagnosis of Marfan syndrome (according to the new Ghent criteria) requires an enlarged aortic root and which of the following?

Selecciona una de las siguientes respuestas posibles:

  • FBN1 mutation known to cause Marfan syndrome

  • Systemic score less than 7 points

  • Scoliosis and facial features

  • Wrist and thumb sign

Explicación

Pregunta 17 de 34

1

Marfan (Sakai)
Marfan Syndrome is a good example of a pleiotropic disease: multiple clinical manifestations are caused by a single defect in a single gene. Which of the following clinical manifestations are characteristic of Marfan syndrome?

Selecciona una de las siguientes respuestas posibles:

  • Joint contractures, arachnodactyly, and short stature

  • Ectopia lentis, short stature and stiff joints

  • Aortic aneurysm, hypertelorism, and bifid uvula

  • Aortic aneurysm, ectopia lentis, scoliosis, joint hypermobility and tall stature

Explicación

Pregunta 18 de 34

1

Metabolism (Wirz)
Children with kawashiorkor usually have a fatty liver, due to which of the following?

Selecciona una de las siguientes respuestas posibles:

  • The high fat content of their diet

  • The high carbohydrate content of their diet

  • The lack of substrates for gluconeogenesis in the liver

  • The lack of substrates for protein synthesis in the liver

Explicación

Pregunta 19 de 34

1

Nitrogen metabolism (Wirz)
Pyridoxal Phosphate is required for which of the following reactions?

Selecciona una de las siguientes respuestas posibles:

  • Glucose -> glycogen

  • Phenylalanine -> tyrosine

  • Propionyl-CoA -> succinyl-CoA

  • Pyruvate -> Alanine

Explicación

Pregunta 20 de 34

1

Nitrogen Workshop (Hansen)
An individual with a deficiency in the conversion of trypsinogen to trypsin would be expected to experience a more detrimental effect on protein digestion than an individual who was defective in other digestive proteases. Why would that be?

Selecciona una de las siguientes respuestas posibles:

  • Trypsin activates other zymogens that are secreted by the pancreas.

  • Trypsin has a greater and wider range of substrates.

  • Trypsin activates pepsinogen, which allows digestion to begin in the stomach.

  • Trypsin inhibits intestinal motility, allowing substrates more time to be exposed to the proteolytic enzymes.

Explicación

Pregunta 21 de 34

1

Nitrogen Workshop (Hansen)
Elevated plasma phenylalanine levels are indicative of which disorder?

Selecciona una de las siguientes respuestas posibles:

  • Tyrosinemia

  • Argininosuccinic aciduria

  • Maple syrup urine disease

  • Phenylketonuria

Explicación

Pregunta 22 de 34

1

Nitrogen Workshop (Hansen)
Tetrahydrobiopterin is required for which of the following reaction pathways?

Selecciona una de las siguientes respuestas posibles:

  • Methionine -> cysteine + alpha-ketobutyrate

  • Propionyl-CoA -> succinyl-CoA

  • Phenylalanine -> tyrosine

  • Pyruvate -> acetyl-CoA

Explicación

Pregunta 23 de 34

1

Pathology (Graf)
A 71 year old woman survives a myocardial infarction (MI). Thirty years later, she has an unfortunate sky-diving accident and dies. At autopsy, a microscopic slide is taken in the area of the old MI and shows which of the following?

Selecciona una de las siguientes respuestas posibles:

  • Necrotic myocytes

  • Clusters of neutrophils

  • Aggregates of macrophages

  • Fibrosis

Explicación

Pregunta 24 de 34

1

Pathology (Graf)
After partial resection of the liver, hepatocytes proliferate to re-build the liver. This is an example of which of the following?

Selecciona una de las siguientes respuestas posibles:

  • Hyperplasia

  • Hypertrophy

  • Neoplasia

  • Dysplasia

Explicación

Pregunta 25 de 34

1

Pathology (Graf)
A 54 year-old man with a long history of sinusitis presented with progressively worsening headaches. Imaging showed a lesion in his left frontal lobe consistent with an abscess. On biopsy, the center of the lesion was filled with amorphous necrotic debris and acute inflammatory cells. Which type of necrosis does this represent?

Selecciona una de las siguientes respuestas posibles:

  • Coagulative

  • Liquefactive

  • Caseous

  • Fibrinoid

Explicación

Pregunta 26 de 34

1

Pathology (Graf)
The left photograph shows a benign neoplasm and the right photograph shows a malignant neoplasm. Which feature of these images best helps to distinguish benign from malignant on gross examination?

Selecciona una de las siguientes respuestas posibles:

  • Circumscribed versus infiltrative border

  • Pale yellow color

  • In the uterine cavity versus within the uterine wall

  • Multiple versus single tumors

Explicación

Pregunta 27 de 34

1

Safety (gorman)
Straight out of residency, your new hospitalist job requires special weekend shifts of 48 hours on call, with sufficient staffing so that each person has several hours of down time in which to take a nap. To achieve more competitive premium rates, the health system cuts back on hospitalist staffing, so that naps are no longer possible during weekend shifts. In passing, several of your colleagues mention that they have caught themselves falling asleep at times, such as when browsing through someone's medical record or doing documentation. This is an example of which of the following?:

Selecciona una de las siguientes respuestas posibles:

  • Normal accidents

  • Swiss cheese model

  • Human fallibility

  • Latent error

Explicación

Pregunta 28 de 34

1

Safety (Gorman)
An intern rotating on your service prescribes nitrofurantoin for a UTI, failing to notice the patient's allergy to this medication on the new handoff forms. The allergy also escapes the notice of the computer decision support system, the pharmacist, and the nurse who checks off all med orders. Fortunately, the person who is passing meds notices the allergy on the patient's ID and does not administer the medication. This situation is an example of which of the following?:

Selecciona una de las siguientes respuestas posibles:

  • Reason's Swiss cheese model

  • Perrow's Normal accidents model

  • Snook's Practical Drift

  • Page's Complex adaptive system

Explicación

Pregunta 29 de 34

1

Trust (Coleman)
You are a medical student rotating in the Emergency Department. Your preceptor asks you go see Sasha, a 22 year-old woman with a chief concern of abdominal pain, who has just been roomed. You introduce yourself to the patient and her companion, Maricel, whom Sasha introduces as her friend. After a brief conversation, you kindly say to Sasha, "I'm glad you have Maricel here for support. I normally like to talk with patients and examine them alone, so in a minute I'd like to have you, Maricel, wait in the lobby, if that's OK with the two of you. Separating an adult (or older child) from a companion can help support a patient's autonomy. Which other ethical principle does this directly support?

Selecciona una de las siguientes respuestas posibles:

  • Fidelity

  • Veracity

  • Stewardship

  • Justice

Explicación

Pregunta 30 de 34

1

Trust (Coleman)
A pillar of biomedical ethics is the concept of fidelity. In the context of medicine, fidelity is best described as which one of the following?

Selecciona una de las siguientes respuestas posibles:

  • The exactness or reproducibility of a given doctor-patient communication

  • Loyalty between doctor and patient

  • Truth-telling between doctor and patient

  • The development of trust between a doctor and patient

Explicación

Pregunta 31 de 34

1

Urea (Ralle)
Which step of the urea cycle takes place inside the mitochondria?

Selecciona una de las siguientes respuestas posibles:

  • Synthesis of carbamoyl phosphate

  • Synthesis of argininosuccinate

  • Synthesis of arginine

  • The release of urea from arginine

Explicación

Pregunta 32 de 34

1

Urea (Ralle)
Which two enzymes provide the ammonia that enters the urea cycle?

Selecciona una de las siguientes respuestas posibles:

  • Ornithine transcarbamoylase and nitric oxide synthase in the liver

  • Glutamate synthetase and glutaminase in the liver

  • Alanine aminotransferase and glutamate dehydrogenase in the muscle

  • Glutaminase and glutamate dehydrogenase in the liver

Explicación

Pregunta 33 de 34

1

Urea (Ralle)
In the urea cycle, the first nitrogen comes from ammonia. Where does the second nitrogen in urea come from?

Selecciona una de las siguientes respuestas posibles:

  • Lysine

  • Glycine

  • Alanine

  • Aspartate

Explicación

Pregunta 34 de 34

1

Anatomy
The thoracic cardiac nerves that pass through the cardiac plexus contain which type of nerve fibers?

Selecciona una de las siguientes respuestas posibles:

  • Preganglionic sympathetic axons

  • Postganglionic sympathetic axons

  • Preganglionic parasympathetic axons

  • Postganglionic parasympathetic axons

Explicación