which of following is not correct about interleukins?
1. IL-5 is produced by activated T helper cells and mast cells.
2. IL-3 is secreted by T helper cells and mast cells.[Answer]
3. IL-8 is secreted by monocytes and macrophages.
4. IL-10 is produced by activated T cells and mast cells
5. IL-7 is secreted by bone marrow stromal cells.
Each of the following DNA virus encodes a DNA polymerase except one, which is this exception?
1. Hepatitis B virus
2. SV40 [Answer]
3. Adneovirus
4. EB Virus
5. Poxvirus
The presence of a granulaomatous inflamation in the GI tract of a patient would be indicative of:
A: peritonitis
B: ulcerative colitis
C: Peutz-Jeghers syndrome
D: Diverticulitis
E: Crohn's Syndrome[Answer]
which of the following steps of collagen synthesis occurs within a fibroblast?
A. Hydrolysis of procollagen to form collagen,
B. Removal of the terminal peptides by collagen peptidase,
C. Formation of a triple helix,(Answer)
D. Formation of covalent crosslinks between lysin and histidine molecules
E. Assembly of the collagen fiber
Which of the following is the first type of cementum formed on a developing root?
A. Acellular intrinsic fibers[Answer]
B. Cellular Extrinsic fibers
C. Acellular extrinsic fibers
D. cellular intrinsic fibers
E. Acellular afibrillar
the founding of yeast cells and chlamydospores in the oral mucosa and also the main fungial infection treated by dentists is caused by:
A: Cryptococcus neoformans
B: Histoplastoma capsulatum
C: Candida albicans[Answer]
D: Aspergillus fumigatus
E: Trichophyton mentagrophytes
Of the following, the permanent tooth that is most frequently impacted is the
A: mandibular canine
B: maxillary canine[Answer]
C: Mandibular 2nd premolar
D: maxillary lateral incisor
E: mandibular lateral incisor
6. B cell receptor differs from T cell receptors in ttubules are lined byhat:
A: B cell receptor are HMC II complex
B: T cells do not have receptors
C: T cell receptors are MHC II complexes
D: B cell receptors can bind to antigens while T cell receptors cannot
E: B cell receptors have two "arms" while T cell receptors have only one[Answer]
Each of the following is a property is shared by filoviruses and hantaviruses except one, which is this exception
A: Both viruses are associated with hemorrhagic disease,
B: Both viruses have negative stranded genomic RNA,
C; Both viruses have segmented genomic RNA[Answer]
D: Both viruses are enveloped viruses
E: Both viruses encode virual RNA transcriptase.
When performing a nerve block at the mandibular foramen, the needle will penetrate the mucous membrane and lie:
A: Lateral to the medial pterygoid muscule(MPM) and medial to the pterygomandibular raphe(PMR).
B: lateral to both MPM and PMR
C: lateral to both the neck of the mandible and PMR. [Answer]
D: medial to the MPM and lateral to the neck of the mandible.
E: medial to both the MPM and PMR.
9. Each of the following organisms can cross the placenta barrire and infect the neonate in utero except one, which is the exception
A: syphilis
B: Rubella
C: HSV-2
D: HIV
E: Rotavirus [Answer]
Taste perception in the anterior 2/3 of the tongue is derived from which branchial arch?
A. 1st
B, 2nd[Answer]
C, 3rd
D. 4th
E, 6th
The maxillary sinus is lined by which of the following types of epithelium?
A. Simple Columnar
B. Simple squamous
C. Striatified squamous
D. Striatified Cuboidal
E. Striatified ciliated columnar(answer) [Answer]
Which of the following bacterial toxins is not found to exhibit ADP-rybosylation?
A. Pertussis toxin
B. Exotoxin A of Pseudomonas aeruginosa
C. Diphtheria toxin
D. Shiga toxin[Answer]
E. Cholera toxin
Which of the following is Not characteristic of mandibular canine
A. The mandibular canine has less pits and grooves than a maxillary crown(Answer)
B. The cusp tip is often lingual to the line bisecting the root.
C. The facial and lingual heights of contour are less than 0.5 milimeters
D. A common variation of mandibular canine is a bifurcated root.
The cell bodies involved in the jaw jerk reflex are found in the
A. trigenminal motor nucleus and trigeminal ganglion
B. mesencephalic nucleus and trigerminal motor nucleus[Answer]
C. trigeminal ganglion and trigeminal motor nucleus.
D. trigeminal motor nucleus and nucleus ambiguus
E. nucleus ambiguus, mesencephalic nucleus and trigeminal ganglion.
The secondary immune response differs from the primary immune response in that the secondary immune response
A. produce IgA instead IgG
B. can form antibodies after a extensive lag period
C. results in higher concentration of longer-term IgG titer[Answer]
D. uses a cell-mediated response rather than a humoral response
E. from antibody directly from memary cells.
Which of the following is characteristic during a Bennett movement
A. The condyl of non-working side exhibits lateral movement
B. The condyl of working side exhibits protusive movement
C. The condyl of working side exhibits medial movement
D. The condyl of working side exhibits lateral movement[Answer]
E. The condyl of working side exhibits lateral and protrusive movement
which of the following is most likely to exhibit a lingual pit?
A. Maxillary lateral incisor (correct answer)
B. Mandibular Lateral incisor
C. Mandibular canine
D. Maxillary central incisor
E. Maxillary canine
Respiratory syncytial virus(RSV) differs from influenza in each of the following ways EXCEPT one. Which is exception?
A.RSV has stable antigen
B.RSV causes syncytia
C.RSV is larger
D.RSV has hemolysin
E.RSV is a single stranded RNA virus[Answer]
Each of following events occurs in RNA splicing except one, which one is this exception
A.U2 snRNA recognizes and binds to the 3' splice site by complementary base pairing[Answer]
B.U1 snRNA recognizes and binds to the 5' splice site by complementary base pairing
C.2'OH of the adenine nucleotide at the brach point attacks the 5' splice site
D.The intron is cleaved off as a lariatl structure,
E.Exons are ligated through a 5' to 3' phosphodiester bond.
Which of the following permanent teeth possess the smallest root surface area
A.Maxillary central incisor
B.Mandibular 1st premolar
C.Mandibular canine
D.Maxillary lateral incisor[Answer]
E.Maxillary 1st premolar
Each of the following statements is correct in regards to the Complement system EXCEPT one. Which one is the EXCEPTION
A.C3a and C5a are vasoconstrictors[Answer]
B.C3a & C5a triggers degranulation of basophils and mast cells to release of histamine
C.C5b,C6,C7, C8 and C9 may assemble to form pores in cellular membranes
D.C3b and C4b may bind covalently to bacterial cell surface
E.Complement system helps to clear circulating immune complex.
Which of the following is NOT a characteristic that applies both for DNA polymerase and RNA polymerase?
A.Both require a primer[Answer]
B.Both require a template strand
C.Both add 5' nucleotides to 3' hydroxyl groups
D.Both reactions produce pyrophosphate as a product
E.Both use 5'nucleoside triphosphates
Which of the following is true of cytokines?
A.TGF-beta suppresses secretion of inflammatory mediators and enhance B cell proliferation
B.T cell proliferation is influenced by TNFs
C.Macropgages secrete TNF-alpha[Answer]
D.Bone marrow stromal cell secrete TNF-beta
E.IFN-beta has antiviral activity and inhibits MHC class I expression
Which of the following embryonic precursors form cementoblasts?
A.Dental papilla
B.Inner enamel epithelium
C.Hertwig's epithelial root sheath
D.Outer enamel epithelium
E.Dental sac[Answer]
Penicillin G is considered the first drug of choice in treating:
A.Staphylococcus aureus
B.E. Coli
C.N. gonorrhoeae
D.Enterococcus faecium
E.N. meningitides [Answer]
each of the following is a common feature of rabies & influenza except one, which one is the exception?
A. in bothe rabies and infleunza, the viral mRNA have a 5' cap structure,
B. in bothe rabies and infleunza, the isolated RNA is not infectious,
C. in bothe rabies and infleunza, the viral genome is single stranded RNA,
D. in bothe rabies and infleunza, the viral particles are enveloped,
E. in bothe rabies and infleunza, the viral genome is transcripted in the cytoplasm of the host cell. [Answer]
a 23 year old patient presents with pain radiation from his neck. Radiographic examination reveals no maxillary or mandibular 2rg molars. the patient claims that he has never had any extractions. which of the following describe the condition.
A. mulberry molars
B. supernumerary teeth
C. congenital absence [Answer]
D. Turner's spots
E. enamel pearl.
All the questions are from the crack of NBDE, the answer from this software might not be all right, just for your reference. please compare them with other reference book for the right answer.
