Arthropda vectors are responsible for disease transmission of the following diseases EXCEPT:

 # Arthropda vectors are responsible for disease transmission of the following diseases EXCEPT:

A. Malaria and Yellow fever

B. Typhus fever and Rocky mountain fever

C. Dengue fever and Japanese encephalitis

D. Diphtheria and tetanus

The correct answer is D. Diphtheria and tetanus.

The primary vectors for malaria are female mosquitoes of the Anopheles genus. Among the various species of Anopheles mosquitoes, Anopheles gambiae, Anopheles funestus, and Anopheles stephensi are particularly important in the transmission of malaria. These mosquitoes can carry and transmit the Plasmodium parasites, which cause malaria in humans.

The primary vector for yellow fever is the Aedes aegypti mosquito. This mosquito species is also known to transmit other diseases such as dengue, chikungunya, and Zika virus. Yellow fever is caused by the yellow fever virus (YFV), and the Aedes aegypti mosquito becomes infected when it bites a person already infected with the virus.

Typhus fever is a group of infectious diseases caused by different species of Rickettsia bacteria. The bacteria are transmitted to humans through the bite of infected arthropods, primarily body lice in the case of epidemic typhus.

American dog tick (Dermacentor variabilis) and Rocky Mountain wood tick (Dermacentor andersoni) are the primary vectors for Rocky Mountain spotted fever (caused by Rickettsia rickettsii).

Dengue fever is caused by the dengue virus, which is transmitted to humans through the bite of infected Aedes mosquitoes. Dengue is a significant public health concern in many tropical and subtropical regions.

Japanese encephalitis is caused by the Japanese encephalitis virus, which is transmitted to humans through the bite of infected Culex mosquitoes. It is a mosquito-borne viral infection prevalent in parts of Asia.

Diphtheria and tetanus are not transmitted by any vectors such as insects or animals. 

The fibroblasts associated with capillaries are:

 # The fibroblasts associated with capillaries are:

A. Plasma cell

B. Histiocytes

C. Lymphocytes

D. Pericytes

The correct answer is D. Pericytes.

Pericytes are cells associated with capillaries. They are located on the outer surface of capillaries and are in close proximity to endothelial cells. Pericytes play a role in supporting the structural integrity of capillaries, regulating blood flow, and contributing to angiogenesis (the formation of new blood vessels). They are not the same as fibroblasts, which are involved in the synthesis of extracellular matrix components in connective tissue. 

Some microorganisms produce a diffuse spreading inflammatory reaction due to the elaboration of:

 # Some microorganisms produce a diffuse spreading inflammatory reaction due to the elaboration of:

A. Coagulase

B. Peroxidase

C. Bradykinin

D. Hyaluronidase

The correct answer is D. Hyaluronidase.

Hyaluronidase is an enzyme produced by some microorganisms, such as Streptococcus, that can break down hyaluronic acid. Hyaluronic acid is a component of the connective tissue in the body, and its degradation by hyaluronidase can lead to the spread of inflammatory reactions by increasing permeability of tissues and facilitating the spread of the microorganisms through the host's tissues. This can contribute to the diffuse spreading of inflammation. 

Dental MCQs Practice for the Day 1st Jan 2024

# Which one of the following is the early feature of hypothyroidism?
A. Low T3
B. High TSH
C. Low T4
D. Low TSH

# In a healthy mouth, the distance between the cementoenamel junction and the border of alveolar bone proper is:
A. Constant
B. Changes with age
C. Depends on inclination of teeth
D. None of the above

# Herpes zoster most commonly affects:
A. Sympathetic ganglia
B. Anterior horn cells
C. Dorsal root ganglion
D. Spinal cord medulla




# The structureless highly mineralized layer formed on the mantle dentin during cementogenesis is called as:
A. Epithelial sheath of Hertwig
B. Hyaline layer of Hopwell Smith
C. Imbrication lines of Pickerill
D. Hyaline layer of von Ebner

# Enzyme appearing last in MI is:
A. CPK
B. LDH
C. SGOT
D. SGPT

# Which one of the following is not a common sign of a fractured zygoma?
A. Subconjunctival hemorrhage with no visible boundary
B. Diplopia
C. Epistaxis
D. Anosmia

# Apical root fracture is visible in:
A. Intraoral periapical X ray
B. Bitewing Xray
C. Occlusal X ray
D. OPG

# Pterygomandibular space contains:
A. Maxillary nerve
B. Facial nerve
C. IAN and lingual nerve
D. None

# The best indication of transpalatal arch is when:
A. there is bilateral missing of second deciduous molar
B. one side of the arch is intact and several primary teeth on the other side are missing
C. Bilateral molar distalization is required
D. Second primary molar is extracted or lost before the eruption of first permanent molar

# Before performing surgery on a patient who is taking warfarin, which of the following should be evaluated?
A. Bleeding time
B. Clotting time
C. Prothrombin time
D. Coagulation time

# Indications of removable appliance are all EXCEPT:
A. Simple tipping movement
B. Minor derotations of incisor teeth
C. Overbite reduction
D. Simple bodily movement

# Which of the following diseases mainly affect nervous system?
A. Meningitis and Herpes
B. Rabies and Herpes
C. Encephalitis and Poliomyelitis
D. Conjunctivitis and meningitis

# Caldwell-Luc operation is indicated in:
A. Chronic maxillary sinusitis
B. Fracture of floor of orbit
C. vidian neurectomy
D. All of the above

# Which of the following is recommended for investment of metal ceramics?
A. Gypsum bonded investment
B. Phosphate bonded investment
C. Ethyl silica investment
D. All of the above

# Foam cells are seen in:
A. Letterer Siwe disease
B. Eosinophilic granuloma
C. Hurler's syndrome
D. Hand Schuller Christian disease

Share

Dental MCQs Practice for the Day 2023 Dec 30

# The eosinophil count in the peripheral blood smear is increased in:
A. Allergic conditions
B. Anemia
C. Polycythemia
D. Typhoid fever

# The number of walls in the apical portion of the defect is often greater than that of its occlusal portion, it is referred to as:
A. Osseous craters
B. Combined osseous defect
C. Horizontal defect
D. Vertical defect



# In marasmus, wasting is due to:
A. Prolonged dietary deficiency of calories
B. Prolonged dietary deficiency of Protein
C. Excess catabolism of fat and muscle mass to provide energy
D. All of the above

# Hyperparathyroidism is associated with:
A. Renal stones
B. Bone resorption
C. Increased level of serum calcium
D. All of the above

# Normal body mass index is between:
A. 16.5-20.5
B. 18.5-24.9
C. 25.0-29.9
D. 30.0-39.9

# Speed at which electrons travel in gas tube once released from cathode filament is dependent on:
A. Potential difference between electrodes
B. Angle between filament and andoic target
C. Amount of kilovoltage applied to the circuit
D. Intensity of current applied to the target

# Most common cause of cerebrovascular accident:
A. Arterial thrombosis
B. Venous thrombosis
C. Embolism
D. Tumor

# Which one of the following is the precursor of both gonadal and adrenocortical hormones?
A. Progesterone
B. Cortisol
C. Testosterone
D. Corticosterone

# Gingival manifestation is seen maximum with:
A. AML
B. CLL
C. CML
D. ALL

# A material like amalgam with high compressive strength but low tensile strength is said to be having:
A. Toughness
B. Brittleness
C. Ductility
D. Malleability

# Immediate management of tension pneumothorax is:
A. Tracheostomy
B. CT thorax
C. Central venous line access
D. Decompression with needle or chest tube

# Platelets adhere to the subendothelial collagen through one of the following:
A. Platelet factor 4
B. Fibronectin
C. Von Willebrand's factor
D. None of the above

# Most abundant immunoglobulin is:
A. IgG
B. IgM
C. IgD
D. IgA

# Dilatation of the pupil in head injury is due to:
A. Cerebral irritation
B. Compression of III cranial nerve
C. Pontine hemorrhage
D. All of the above

# Most common cause of thyrotoxicosis is:
A. Grave's disease
B. Multinodular goiter
C. TSH secreting pituitary tumor
D. Toxic adenoma

# Drugs producing ototoxicity and nephrotoxicity are:
A. Tetracyclines
B. Aminoglycosides
C. Quinolones
D. Macrolides

Share

Chromatolysis is:

 # Chromatolysis is:

A. Disintegration of nucleus

B. Disintegration of golgi apparatus

C. Disappearance of Nissl granules

D. Decrease in cell size

The correct answer is C. Disappearance of Nissl granules.

Chromatolysis is a reactive change that occurs in the cell body of damaged neurons. It involves the dispersal and redistribution of Nissl substance (rough endoplasmic reticulum and polyribosomes) to meet an increased demand for protein synthesis. 

Salivary protein which prevents transmission of HIV via saliva is:

 # Salivary protein which prevents transmission of HIV via saliva is:

A. Sialoperoxidase

B. Secretory IgA

C. Salivary leukocyte protease inhibitor

D. Histidine rich proteins

The correct answer is C. Salivary leukocyte protease inhibitor.

SLPI blocks HIV-1 infection of macrophages and primary T cells at concentrations (1–10 μg/mL) that occur naturally in saliva (Shugars and Wahl, 1998). These findings suggest that SLPI may be partially responsible for the low rate of oral transmission of HIV-1.